US2268778A - Space heater - Google Patents

Description

Jan. 6, 1942. G, M SCHUEDER ETAL 2,268,778

SPACE HEATER Filed March l, 1939 3 Shee'bS-Sheet l Mln A mum Jan. 6, 1942. G. M. SCHUEDER ETAL 2,268,778

SPACE HEATER Filed March 1, 1939 's sheets-sheet 2 INVNTORS of e M Sckedef BY e147 27621471222 ATTQRNEY.

Jam 5, 1942 G. M. scHur-:DER ETAL 2,258,778

SPACE HEATER 3 Sheets-Sheet 3 Filed March l, v 1.939

4 Fig 10 INVENTO Govg7 Jf. Sch-aedl' Z715 e FarfeZZ TTQRNEY.

Patented Jan. 6, 1942 George M. Schueder and Eugene F. Farrell, Detroit, Mich., assignors to Evans Products Company, Detroit, Mich., a corporation of Delaware Application March 1, 1939, serial Nofzsaoaii (ci. 12s-671) v35 Claims.

This invention relates to certain improved features, arrangements, and constructions for space heaters or the like. and has special reference to floor-supported, air circulating, unit heaters for rooms, small homes or the like' which are directfired 'or contain a high temperature air heatingl combustion unit burning oil, gas, or other fuels,

stratiilcation of the air and cold floors.

uneven distribution results in high temperature in the upper portion of the room and comparay tively low temperature at and adacent the floor and which contain a fan in their lower `portions to pull air to be heated downwardly therethrough.

' and to provide a` low level, but safe, forced discharge of the relatively high temperature air across the room floor.

Preferably, the fan or blower, the air heating unit, -the air openings and other parts are so arranged that the heater may be operated; if' sodesired, by the conventional or natural upward,

' comfort by proper air circulation.

thermal convection air flow therethrough, or

else by the above-mentioned blower-forced downward or contrathermal air flow.

In the two illustrated embodiments of the present invention, the unit heaters include an upright cabinet having upper and lower air openings and containing an upright combustion-air heating. unit. This heating unit may employ the conventional pot-type burner for oil or the 4like housed in a drum also forming the .expansion chamber. Associated with this combustion unit is an upwardly-extending air heating passage. As will be apparent to those skilled in this art, various types of combustion units or associated air heating passages may be employed within the purview of this invention. l

'I'he bottom of the air heating passage is closed, preferably by a closed bottom for the cabinet spaced slightly above the room floor bythe cablnets supporting feet.- Preferably, this lower air opening is formed by a long, narrow grille extending across the front portionof the cabinet adjacent its bottom -and comprising upright ymembers integral with the cabinet side walls.

The upper air opening may be a large area grille ln the flat top of the cabinet.

The above-described structure will operate by the conventional natural or upward air flow, and this't'ype of operation is more or less satisfactory for small or moderate amounts of heating or for low fuel settings. However, it will be appreciated that when-it isv desired to greatly increase the rate of h eat, this natural or chimney type of air circulation limits the capacity of the unit so 'that blower-forced circulation is desirable. However, if theblower or fan is usedto assist level, reduces the comfort materially, and requires that more heat and'fuel be used to reach the desired comfort level. v

Therefore, it is desirable to forcethe heated air out close to the floor and preferably in a thin,

'wide stream across the room. This will not only heat the lower portion of the room and give' proper distribution of air, but will increase the However. in the large capacity space heaters of this type employing a high temperature combustion type air heating means, the air discharge from the lower opening or grille may be at temperatures of as high as or over 250 F.

Whereas the underwriters will not permit the floor temperature to be raised more-than about 90 F. above room-temperature, or to a maximum of about 160 F., if air at even as high a temperature as this is permitted to strike the floor, it will produce undesirable results since it will be injurious to floor covering, such as'linoleum, or to the wood of the oor itself.

The present invention provides means to eject this forced or relatively high velocity stream or air across the floor ina stream.which issues from the heater cabinet very close to the floor but subg'perature is much lower, due to diffusion with -cooler air, and, in addition, warm air is rising from the stream so that ,hot air striking the floor beyond this range will not be objectionable. 'I'his invention contemplates a very simple ar- 40 rangement or means to force and direct this the upward flow and distribution of the heated air, =it merely accentuates one of the objections a of the upward' flow type space heaters: that is, 65 the cabinet to achieve downward air flow. Pref-` stream of hot air, .and includes means consisting of a substantially horizontally-discharging blower in the lower part of the cabinet at or about the level of the lower opening, so that the fan blades themselves. force the. air in a substantially horizontal streamv and give it directly the desired directional characteristics. Thus it Ais not essential to have air directing vanes or fins associated with the lower opening, and it will be appreciated that since the air is being pulled or l drawn down through the air heating passage,

which is thus at a slightly sub-atmospheric pressure, it is not necessary to employ any movable top closure or shutter in the upper portion' of erably, this fan is positioned under the air heating unit, and in the preferred form it consists of a wide, thin or flat, centrifugal blower of the lbackward tipped blade type, the advantages of which are mentioned hereinafter.

Where the long, narrow, blower discharge opening or grille is substantially co-extensive with the effective discharge area of the blower, or where this grille 4extends around the periphery of the centrifugal blower, as in Figs. 1 and 4, no plenum chamber or relative restriction of the opening formed by the grille will be necessary to achieve flow of air from the whole length of the grille. However, in cases where the long discharge grille extends across the front face of the rectangular cabinet containing the blower, it is desirable to form these lower openings as relatively restricted so that the high temperature air builds up a pressure in a plenum chamber, thus insuringV its discharge through the Whole length of the opening.

In either form of the device, it is desirable to make this lower grille integral with the side walls of the cabinet and formed of upright members which form a part of and strengthen or vbrace the cabinet side walls. In addition, in the case and thus providing a safe stream of high temof a fiat front, rectangular cabinet, these uprigh-t members form relatively short yrestricted openings tending to produce an outward air flow normal to the cabinet front.

The capacity of a -g'lven unit may be raised by forced draft to the combustion unit supplied by a connection from the air circulating fan or blower, and, in addition, the manual control for the fuel setting may be interconnected to the switch for the blower electric motor so that the blower goes on only at high iire or high fuel settings and is automatically turned oil at low re.

In order to reduce noise and vibration, both the fan and its driving electric motor are carried by a vibration-absorbing mounting, and in order to permit ready replacement or servicing for the cheap type of electric motor, this motor or the vmotor blower unit is mounted so that it may be readily removed through the cabinet bottom.

`It is important, particularly where -a rather cheap type of electric motor is used, that it be mounted out of the path of high temperature air and positioned away from radiated heat. In addition, it is desirable to further reduce its temperature by providing means for drawing cool air over or through this motor by a connection to the intake side of the air circulating fan.

The tank for oil or other fuel and the float valve control chamber are also mounted out of the path of high temperature air and are shielded from radiated heat. In the case of a completely enclosed cabinet, shown herein as of the low boy type, these two units are mounted in an auxiliary, upwardly-extending and open-ended air passage which is so arranged that the blower operation draws cool air over and past these units.

Other features and arrangements of this invention will be apparent from the detailed description and drawings herein.

In` general, the objects of this invention are to provide an improved and simplified unit space heater providing forced, low level discharge of hot air.

More particularly, objects of this invention are to provide a. 'forced air circulating space heater in which the fan or blower is positioned l at substantially the same level as the low level lateral discharge opening lo that nigh temperaperature air across and close to (but not immediately striking) the room oor; to provide a heater of this type in which the airis drawn or pulled down through the air heating passage, thusy removing the need for any upper or top shutters or other closures toy selectively prevent or permit the upward thermal iiow; and to provide forced draft to the combustion unit from the same air circulating fanor blower.

Other objects of this invention are to provide a space heater which is particularly quiet in operation by carrying the blower and its driving motor on vibration-absorbing mountings, and to provide a space heater, or the like, which may employ a relatively cheap type of blower-driving electric motor mounted so that it can be readily removed, positioned out of the path of high temperature air, shielded from radiated heat, and having means so that the air circulating fan or blower pulls cooling air over or past this electric motor to reduce itsv temperature.

Other objects will be apparent from the foregoing statement of the generan features and advantages of this invention and from the following detailed description and drawings.

Referring to the drawings, in which:

Fig. 1 is a general view of a space heater, in side elevation, embodying a preferred form of the invention, a portion being broken away to disclose the nature of parts interiorly of the space heater;

Fig. 2 is a view thereof, in vertical section, taken substantially on the line 2-2 of Fig. l, except that the blower 32, the burner 6, and associated parts are shown in elevation;

Fig. 3 is a transverse section taken on the line 3 3 of Fig. 1;

Fig. 4 is a transverse section taken on the line I-4 of Fig. 1;

Fig. 5 is a front view of a rectangular or low boy typ'e space heater of an alternative construction, the outer casing or shell thereof being sectioned away centrally and longitudinally of said casing to disclose an alternative embodiment of the invention;

' Fig. 6 is a view of the bottom of the space heater shown in Fig. 5, parts being broken away to disclose the'nature of underlying parts;

Fig. 'l is an end' view of the construction shown in Fig. 5, the casing and parts interiorly thereof vbeing broken away to show the control mecha- Flg. 8 is a fragmentary view, in section, taken on the line 8 8 of Fig. 5;

Fig. 9 is a detail fragmentary top plan view of the means for mounting the motor, and

Fig. 10 is a fragmentary view to show the motor mounting depicted in Fig. 9, in side elevation, and also to disclose diagrammatically the connection between the valve control means and the switch controlling operation of the motor, the motor being shown in side elevation and the con trol wheel in top plan.

Referring now more particularly tothe draw- The embodiment of Figs. 1 to 4, inclusive, disi closes a very cheap and compact form of space contained, Aand which does not have the attractive appearance obtainable in the rectangular cabinet type. This space heating unit comprises a cabinet, outer casing or shell I, preferably of sheet metal, in the form of a cylinder which may be formed, for example, by a single sheet of metal bent and joined along a seam, said cabinet having integral supporting feet 2, the portions between the feet being cut away as shown. Casing I is surmounted by and has suitably secured to stamping having an integral air passage grille 4 formed therein. .'I'he elements of the grille I are simply cut and -bent-over portions or the upper surface of the cap 3, and it will be apparent that these elements, being integral with the cap, serve to brace or maintain its rigidity and also give a pleasing exterior appearance with low resistance to air ilow therethrough. vIt will be apparent to those skilled 'in this art-that casing vI and cap 3 may be formed of sheet metal in other ways if desired.

When liquid fuel, such as oil, is used, this hea ing unit is provided with a fuel reservoir 5 whichv may be' positioned exteriorly and laterally of the casing I and supported thereon. Fuel, such as oil, is conveyed from reservoir 5 by means of a pipe 8 through a manually regulatable valve and oat type level control unit 9 and by pipe I0 to a pot-type burner t. Pipes 8 and ID are provided with conventional or approved fittings, and since the details of the valve-float unit 9 and .it a cap y3,preferably a one-piece sheet metal I l 3 and 23 and having open upper and lower ends. Preferably, this shroud or shield 2l extends from. or slightly above, the top of the combustion unit 1 to the bottom of the expansion chamber Il, and it is of curvilinear transverse form surrounding the expansion chamber I4; Shroud 2I divides passage I9'into an-inner and an outer prtion. Such a shroud acts as a radiation shield and aids in reducing the temperature of the outer shell. It also co'nnes the air being heated in the. inner passage, raises its velocity, and increases the eiiiciency of the heater.

An opening 24 is provided in the front of the shroud 2I which, together with door 25 in casing I and door 26 in wall II, provides access to the interior of the expansion chamber il for lightingthe burner, cleaning it, etc. lIt will be noted that upon removal of damper I8, the fitting connecting pipe III to burner 5 may be removed through I1, after which burner 5 may be lifted out through doors and 26 and opening 24 for servicing, or the like.

To increase theeillciency of this space heating unit, an economizer 20, consisting of a downthe pot burner 6 form no part of the present.- invention and are well-known in this art, they are not illustrated or further discussed herein.

As is conventional in this art, the fuel control valve unit 9 is provided with a suitable controllinkage (not illustrated) whereby the fuel supply can be turned on or ofi.' and regulated from some desired point.

The upright combustion unit 1l comprises a drum formed by a cylindrical mem-ber having 'side walls II and upper and lower end walls I2 and I3, respectively, which are joined and-sealed to the side walls in any desired manner. 'Ihis combustion unit is divided into an expansion chamber I4 and a burner'chamber I5 by a horizontal partition 'plate I6 having an up-turned, peripheral flange welded, screwed. or otherwise suitably secured to the walls II. From this plate IS the burner 6 is suspended centrally of the vertical axis of the stove. The combustion. unit 1 may be suitably supported from thecasing I by any conventional means, but, as shown, this supporting is achieved .by a plurality of conduits I1,I1; rigidly'butremovably connected to both the casing I and the walls II, and by tubes 5I'-5I rigidly butremovably connected to walls II and platev 42. Flue connections 21 and 28 brace the upper portion of the combustion unit wlthrespect to casing I. Air to support -combustion is supplied through'these conduits I1-I1, and this air supply may be regulated by means of suitable dempers I t-Il positioned at the voutside ends of the conduits I1. Although the, dampers Il may be of any approved or conventional type, they are shown as being of the rotary, divideddisk type. The` numeral Il designates the air heating space or upwardly-extending passage or passageway betweemthe walls II and the outer casing, I. It will be noted that this passage I9- -is open at its upper and lower ends.

wardly-extending heat exchanger and additional expansion chamber, is provided outside oi' shroud 2I in the outer part of passage I9 so that additional heat may be removed from the escaping iiue gases. As shown in Figs. 1 and 3, the combustion unit 1 is disposed eccentrically of and ,towards the front of the heating unit in order to provide room for this economizer 20, which is illustrated as being between the shroud 2| and the casing I although it will be apparent that it might be positioned inside the shroud if desired. A cross-section through the upright walls of economizer chamber 20, which may be formed of sheet metal in any desired manner, shows that it is formed of an elongated and curved oval, as shown in Fig. 3. l Flue gases rising to the top of the expansion chamber Il will pass out of the upper flue 21, will be drawn through the economizer 20 where they undergo additional expansion and give up additional heat, and are conductedby removable ilue connection 28 to the stack or the like. This economizer chamber such as its connections to the ilue pipes 21 and 28, and, asnoted above, it and its connections 21 and 28 also serve to brace drum 1. The complete combustion unit 1 with its shroud 2| may be removed for major servicing by removing cap 3 and lifting these units out the open Itop after disconnecting conduits I1I'I, 5I5I, pushing ilue connection 28 back into economizer 2l, pushing economizer 20 in close to shroud 2|, and disconnecting oil pipe il This heater is assembled in substantially the reverse order of operation. A

As will be discussed in greater detail hereinafter, air .t0 be heated may rise throughl passageway I9 by normal, thermal circulation, or,

at the option of the user, air may be pulled down illustrated, this blower unit employs a comparatively large diameter and rather fiat or thin ccn- -trifugal blower wheel 32 which is preferably of the so-called backward tipped." blade type. This il ilhlstrated in Fig. 4 in which the blower wheel` Although various types of blowers or fansv 32 is intended to be rotated-counterfclockwise.

lAs. is understood in the Ventilating art, this paratively low velocity as distinguished from the high velocity discharge of a small volume. addition it isa quiet running type.

It will be noted that the motor-blower unit 3| is positioned eccentrically or to the rear of the cylindrical casing I (see Fig. 4) so that the imperforate back portion of wall will `form la more efficient scroll closer to the blower blades.

Blower wheel 32 is mounted on the shaft 33 of a conventi-unal electric motor 34 which isenergized and controlled by a conventional circuit and conveniently positioned switch which are not illustrated herein. Arms 35 secured on the casing 34 are bolted or otherwise secured to the supporting disk 36. These arms 35 may bc formed of suitable vibration-absorbing and sound-deadening material, such as a plastic, or there may be yieldable, vibration-absorbing and sound-deadening material, such as rubber, interposed between arms 35 and disk 36 to quiet the operation of the blower-motor unit.

A circular base plate 31 is secured in the lower part of casing lA in any convenientmanner, such as a welded or other connection between an integral ange or apron and the walls of casing I. The base'plate is provided with a circular aperture 39 which is positioned eccentrically thereof and towards the rear of the heating unit. This aperture is large enough to pass the blower wheel 32 but is smaller than the disk 36. 'I'he supporting disk 36 is suitably andremovably secured to plate 31 by bolts 4|. It will be apparent that by undoing bolts 4| the entire blower unit can be removed for servicing or replacement since the blower wheel can ybe withdrawn through the circular aperture 39. Above, and in close proximity to, the blower wheel 32 is an enclosure disk 42 secured to the walls of shell by an integral, upwardly-extending flange 43 otherwise similar to ange 38 of plate 31. Disk 42 has a circular aperture 44 which is concentric with the axis of the blower unit 4| and is dened by a uniformly rolled lip 45 forming, in eiect, a nozzle extending slightly within the open upper end of the blower wheel 32. It will be apparent that when the blower is not running and the burner is'operating, air mayenter through the grille openings 29, pass through the blower blades and aperture 44, and rise up through the heating passageway I9 to be discharged through the top grille 4. When the blower is running, it will pull air down through a reverse of this path and discharge it directly out through the grille openings 29. Note that the blower itself and its horizontally-directed discharge are at the same horizontal level with the grille openings, so that the blower blades themselves give the air stream its directional characteristics, discharging it horizontally to and out the grille openings. These openings are spaced slightly above the floor s'o that the `high temperature air issues in a wide, flat,lsubstantially horizontal stream which does not immediately impinge upon the oor and cause dangerous overheating thereof.

This lower opening or grille lis formed of a number of short ports 29 extending a little more than halfway around the circular casing Each individual port is preferably of rectangular con tour'and is produced by shearing three of the four sides of the port, thereby producing a tang 46 extending from the fourth side (Figs. 1 and fifi 4). The inwardly-turned tangs 46 are arranged to point toward the axis of blower unit 3| to give a radial guiding effect to the air discharged from the blower 32. It is conventional to place such heaters against the wall, and it will be noted that the ports 29 do not extend around the back portions of the heater unit so that high temperature air is not discharged against the wall. The upright, integral tangs 46 form a part of the casing and afford a considerably stronger construction than would be obtained by a separate grille.

It will also be noted that ports 29 arranged around the periphery of the circular casing serve to fan out Vthe stream of air; that is, the air, being more or less radially directed, will emerge in a widening stream.

In this form of the invention, the opening formed by ports 29 of the integral grille may be quite large relative to the rate of discharge from the blower wheel 32, so that there is comparatively little pressure built up in the blower chamber formed between the bottom 31 and the partition disk 42 and the air is thrown out through the openings 29 with little or no jet effect. Thus it will be apparent that in this form of the in-rV vention the openings or ports 29 do not necessarily have to perform any function of directing movable for servicing, as discussed above, and, in-

addition, sin'ce a cheap type motor is particularly susceptible to overheating, it is necessary that it be kept cool. This is accomplished by mounting it in the space beneath the cabinet bottom where it is shielded from vthe high temperature air stream and radiated heat .by the bottomv 31. In addition, it is desired to cool this electric motor 34 by the following arrangement. 'I'here is a space 41 between the motor and the bearing disk 36, and the disk 35 has a relatively large area opening 48 for the motor shaft and for air now. The bottom of the blower wheel has a plurality of apertures 49 around its shaft so that the interior or low pressure region of the blower wheel is communicated through these openings 49 and opening 48 to the space above the electric motor. Thus. when the blower is running, relatively cool air on or adjacent the floor will be drawn up from the iloor and through oraround the motor to cool the same. 'I'his slight addition of cool air will not materially aiect the heaters performance.

In order to raise the combustion rate of a. given size unit for high fuel settings, it is advantageous to add a regulated amount of air underforced draft to the combustion unit. To this end, conduit or elbow tube 5| is disposed rearwardly of the space heater to connect the burner chamber |5 with the blower chamber 52 between the plate 31 and the baille 42. It will be noted that this tube 5| communicates the burner chamber with that part of the blower chamber 52 which is remote from the ports 29 and consequently at its point of highest pressure. A suitable damper 53 mounted on a shaft 54 to be manually adjusted byhandle l55 may control the ow of air through tube 5|." If it is dampers I9 should be closed. However, since the burner chamber normally draws in air throughl air supply conduits |1 and is thus at a slightly sub-atmospheric pressure, a material increase in in which case dampers I8 may be left partly open;

Figs. to` 10, inc.,-dlsclose an alternative embodiment of the present invention including a so-called low boy or rectangular type of cab inet which encloses all of the operating units, such as the oil tank, iioat valve unit, etc. Ingthis modication, the blower 8| is driven by a small, cheap, electric motor 82 by means of a conventional V-type belt 63.

In the description of this modication, those features or units, such as the combustionunit, the centrifugal blower, the control valve-iloat chamber, and others, which are similar to those described rabove in connection with Figs. 1l to 4, inc., will not be discussed in detail nor their similar advantages or cooperations further pointed out. V

In general, this construction comprises a generally rectangular or oblong sheet metal base 84 supported by suitably secured sheet metal feet 65-65, a sheet metal casing 66 of rectangular transverse contour with rounded corners and rounded top edges, and a large-area opening or openings formed by an integral grille 61 in the top thereof. integral top and grille 61 may be `formed from sheet metal in any desired or conventional fashion.

The base 64 carries landl serves as a `support for all the operating units of this heater, and the casing 66 which is in the form of an open-bottom shell is slipped down over the base and its several operating units, supported thereon and suitably secured thereto. Base B4 carries a vertical partition, 69 or insulating baille also serving as a radiation shield winch extends from front to back of the base and the casing S6 and approxlmately to the top of the combustion unit.

Fuel tank 68 is removably supported by brackets 88C on the other side of partition 68 from the combustion unit., A Ysuitable door in the end oi the cabinet 66 permits a combined ller spout and closure unit to be swung out through this door opening for filling. In addition, this door permits inspection lof a suitable oil or fuel level indicator 682B.

Fuel is conveyed from the tank 68 to a suitablev or pot-type burner 1l within the drum-like'combustion unit 12 by means of a pipeline 13 having suitable iittings and including a control valveoat chamberunit of the same type as unit 8 any desired fashion) and out through lower ue connection 11 to a conventional stack or chimney. Note that the economizer-heat exchanger 16 is positioned outside of the shroud or radiation shield 86 in the upwardly-extending space between the comb Jstlon unit and the upright par= tition 69.

v Combustion unit 12 is mounted on the horizontal partition member 18 which is in turn sup? ported 'from the base 64 by'downwardly-turned end portion 1li-and braces or supports 8l and 82. The downwardly-turned end portion 19 oi this partition 18 may be suitably secured to the upwardly-extending partition 88. It will be noted that this partition 18 with its downwardly-turned end portion 18 and its braces 8l and 82. which last are suitable secured to the bottom 64, form with the bottom 84 a rigid box-like frame for `the base of this heater unit. This frame isquite strong and rigid although it is made of a relatively small quantity of sheet metal. In addition,

.v tion 68 to brace the sheet metal walls of the cabchamber covered by this partition 18 are formed y This casing or shell 88 with its inet 66. Front, back, and one end ofthe iiat by the front, back, and one end wall ofthe cabinet 88. Y

Partition member 18 is suitable secured to the base 64 byany conventional means. Centrifugal blower 6],.which is of the backward tipped" blade type similar to blower 82 discussed above, is positioned underneath the combustion unit 12, and directly above the blower 6l. the partition 18` is provided with an aperture88 having a uni- 88 between the feet or downwardly-extending portions which rest on partition 18 and are se-v cured lto strap members 93. A shroudor radiation shield 86 spacedly surrounds the combustion unit 12 and is mounted thereon and on the partition 18 by metal straps 83 which also serve vto secure vthe combustion unit to the partition 18.

These straps .-93 may be screwed, welded, or otherwise secured.

Upon operation of the blower Si, air is pulled down through grille 61't0 the.downwardlyex= tending air heating passage 81 (which is divided by wall 86) through an opening 88, and through aperture or nozzle 83 into the blower -8l from which itis discharged into the flat 'chamber under the partition 18 and above the `bottom 64.

A long, narrow, integral grille 8l is formed o f integral tangs struck out of the casing sheet metal in a manner similar to 'that described in connection with Figs. 1 to 4, inc., and the ends of the casing contain similar grilles 89 and 84. 'I'he high temperature heated air is discharged from the nat chamber under plate 18, through grille 89 and the long front grille 9i. In order to insure the discharge of this heated air from the whole length of grille 9| and also from grille 89, the tangs forming these grilles are rather closely spaced to form short and relatively restricted openings. Thus the total blower discharge opening from. the cabinet is somewhat restricted relative to the rate of blowerl discharge so that the flat chamber under plate l18 is, in eiect, a plenum chamber from which the air discharges under pressure through the series 4of openings of the grilles 89 and 9|. The inwardlydirected portions of the integral tangs.forming these'grilles, and the fact that they are close ltogether forming short passages, aids in causing the outward air iiow to be substantially normal to the cabinet front and vend. It will be noted that, as described in connection with the modifi--v cation of Figs. 1 to 4, inc., the blower-forced air stream is given its horizontal direction bythe be heated enters the cabinet through the upper grille 61 and through the end grille 94 and through the opening in the bottom about the electric motor 62. Thus there are a plurality of air inlets. While a major portion of the air to beheatedwill be pulled down through the upper opening |51, a portion o1 the air will enter through grille 94 and the opening about motor 62 and rise through the end air passage formed between the cabinet walls and the upright partition 69 from which it will turn and be pulled down through the air heating passage around the combustion unit. This air rising up through the above-mentioned air passage will iiow all around the oil tank 60 after having first been drawn past the electric motor 52 and the control valve-oat chamber unit 14 which is positioned in this passage alongside the electric motor 62.

During blower operation, a natural upward cw of air through this end passage containing the oil tank is assisted by the blower. It will be apparent thatwhen the blower is not r, there will still be a natural upward or thermal flow of air through this passage which will mix with and temper the natural or upward thermal flow of air through the air heating passageway. Thus, during either'operation, there is a cooling air iiow for the oil tank, the electric motor, and the oat chamber unit.

Blower 6| is rigidly mounted on` a shaft 96 which is, in turn, journaled in and carried by a bearing member 91. This member is bolted or otherwise secured Yto the bottom 64. It has a vibration-absorbing member 91A, of rubber or the like, between it and the bottom $4 and'between it and its securing bolts to prevent any metaltometa1 contact and the transmission of vibration and noise from the blower wheel. A pulley 98 is keyed or otherwise secured to the lower end of shaft 96 and is driven by a conventional V-belt 63 which is connected by a similar pulley to the lower end of the driving shaft of electric motor G2.

Air to support combustion in the unit 12 is drawn up by the normal draft suctionthrough extend from the combustion unit bottom 84,

through the partition 18, down to and. through openings in -the cabinet bottom 64. The amount of combustion air drawn from under the cabinet bottom may be regulated by suitable dampers 99-99 rotatable about pivots I0| to cover or uncover the lower ends of the conduits ||00.

In order to provide a forced draft 'for the combustion unit from the blower wheel 6I, the conduits |00|00 have apertures |02-I02 directly facing the blower wheel discharge to receive hot air directly from this blower wheel and toy convey the same into the combustion unit 12.

The area of these apertures |02 may be regulated by sleeves ID3-|03 which are telescoped over these conduits |00|00 and are provided with cooperating apertures |04--I04 which are adapted to register with the apertures |02|02. By rotating either or both sleeves |03|03 about -the conduits IUD-|00, the effective cross-sectional area opening into these conduits may be varied. It will be apparent that. the operation of this forced draft organization will be similar to that described in connection with the modification of Figs. l to 4, inc.

The electric motor 62 is adiustably mounted relative to the motor 6| by means of a mount by a single manual control.

designated generally by the numeral |05 and comprising a strap 'metal yoke |06 and a pair oi.' legs ISL-|01. The yoke |06 includes a pair of curved elements |08 and |09 embracing the vertical sides of the motor 62, and the yoke |06 is provided on opposite sides thereof with opposed necks ||0 joined by portions III-I I. The necks I I0 afford fiat surfaces for holes |I2 adapted to receive tie rods ||3| I3 so that clamping of said tie rods may pinch the yoke about the body of the motor B2. The lower extremities of the legs HB1- |01 are bent horizontally to provide feet ||lI-||4. The feet |I4-II4 are cooperatively associated with a pair of slots ||5||5 in the base 64 since bolts IIE- H6 pass through the feet II-I I4 and slots ||5| I5 to clamp the motor in a desired position relative to the blower. In order to dampen the vibrations set up by operation of the motor, the legs |01-I 0l are connected to the yoke |06 by sections of rubber ||1| I1 bonded in adhesion with the yoke and legs. 'In accordance withthis construction, it will be noted that the motor is supported over the aperture 05 in such a way that to remove the motor for repairs all that is necessary is to remove the bolts ||6| |6 and then to swing the motor and mounting through a quarter turn in order that it may be removed through the aperture Q5.

Since it is generaly desirable to use the blowerforced circulation only with high fuel settings, means are provided to regulate the fuel settings and contro1 the energization of the blower motor As seen in Fig. '1, the fuel valve unit 14' is controlled by a manual control disk H8 through shafts H9, |20 and I2@ and universal joints |2| and |23. This manual control disk ||8 is carried by a suitable bracket which has integral therewith a shelf |26 and which is removably secured to the front of the casing 56 by screws |25A, thus permitting this bracket to be detached from the outside of the casing. Shelf |26 carries a bifurcated lever |21 rotatable about fulcrum |28 normally held in either of its extreme positions by means of a tension spring |29 which is anchored to a pin |36 extending from the shelf |26, and a pin |32 on the lever |21. y either side of the lever |21 and mounted on the shelf |26 eiectively limit rotation of the lever about its fulcrum |28. since the fulcrum |28' is between the points of anchorage of the spring |29, said spring will retain the lever |21 in either of the positions shown. The lever I21-is so mounted as to be cooperatively associated with a switch having a resilient blade |36 mounted on a block |31 of some insulating material such as Bakelite by means of a terminal bolt |38. The blade is normally in contact with a contact screw |39 so that an electric current may ow from. a wire |4| to a wire |42 by way of the bolt |38, blade |35, screwv |39, a wire |43 and motor 62. Extending perpendicularly from the surface of the control disk IIB, a stud |44 is disposed in 4cooperative relationship with arms |45 and |46 of the lever |21. As rotation of the disk ||8 causes engagement of the stud |44 with oneof the arms |45 or |46, the lever |21 is rocked about its filcrum from one extreme position toward the other extreme position, being resisted by the tension of the spring- |29 until a midway point is reached, beyond which the spring assists rocking of the lever |21 to a position of rest with a snap. It will therefore bel apparent that, as

Pins |33 and |34 stationedon It will be apparent that illustrated, counter-clockwise rotation of the disk ||8 has just opened the switch |35. Continued counter-clockwise rotation beyond this position is intended to close the valve 'I4 to extinguish a re within the stove 12. Clockwise rotation of the disk beyond the position illustrated completes -switch |35, arcing between the screw |39 and blade' |26 is minimized or obviated. Y It will be apparent that this interconnection -between the blower motor support and the manual fuel setting control by means of a lost motion-snap action type of mechanism causes the blower to be turned on or oil when the fuel 'setting passes a pre-determined point while beingturned up or down.

Cabinet shell or casing 66 slidably .engages the sides of upright partition 69, is braced thereby,

said fan means is running it will pull air down through said upper opening and said passageway and discharge this high temperature air out said lower opening substantially horizontally and safely above the room oor to prevent objectionable overheating of the floor closeto the heater and, when said fan means is 'not running, air will rise up by thermal convection through said lower opening and said passageway and out said upper opening.

-3. A unit space heater comprising an upright, door-supported 'cabinet containing a combustion heating unit and a contiguous, downwardly-extending passageway for heating airto a high temperature, said passageway having an upper air opening and having a lower, lateral air openand may be suitably secured thereto if desired.'

,It will be apparent that upon disconnecting the outer flue connection and disconnecting the bracket this cabinet shell 66 may be lifted up from Athe base 64 to expose all of the operating units which are carried on the base. This permits easy servicing and a simple factory assembly.

While only two embodiments of this invention are illustrated and described in detail herein, it is to be understood that various changes and modifications may be apparent to those skilled in the art without departing from the spirit and scope of this invention, and therefore the same is only to be limited by the scope of the prio art and the appended claims.

We claim: g

l. A unit space heater comprising an upright, floor-supported cabinet containing a combustion heating unit and a contiguous, downwardly-extending passageway for heating air to a high l temperature, said cabinet and passageway having an upper air opening and having a lower, lateral air opening communicating directly with the room adjacent but safely above its floor, and

fan means in the lower part of said cabinet and passageway discharging substantially horizontally directly from its blades to and out through said lower opening directly into the room so that when said fan means is running it will pull air down through said upper opening and said passageway and discharge this high temperature air out said lower opening substantially horizontallyand close to but .safely above the room floor to prevent objectionable overheating to the iloor close to the heater and, when said fan means is not running, .air' will rise up by thermal convection through said lower opening and said passageway and out said upper opening.

2. A unit space heater comprising an upright, floor-supported cabinet containing a combustion heating unit and a contiguous, downwardly-exe tending passageway for heating air to a high temperature, said cabinet and passageway having an upper air opening and having a lower, lateral air opening communicating directly with the room adjacent Abutsafely above its oor, and fan means in the lower part of said cabinet and passageway below saidy combustion unit and close along side of and discharging .directlyfrom its blades substantially horizontally to and directly out through said lower opening so that when ing communicating directly with the room adjacent but safely above its floor, and fan means in the lower part of said cabinet and passageway, an electric motor driving said fan means and positioned safely out of the path of high temperature air, said fan means discharging directly from its blades substantially horizontally to and out through said lower opening so that when said fan means is running it will pull air down through said passageway and discharge and horizontally direct this high temperature air out said lower opening and, when said fan means is not running, air will rise up by thermal convection through said lower opening and said passageway and out said upper opening.

4. A unit space heater comprising an upright, floor-supported cabinet containing a combustion heating unit and a contiguous, downwardly-ex( tending passageway for heating air to a high temperature, said passageway having an upper air opening and having -a lower, lateral air open- 4ing communicating directly with the room adjacent its iioor, and an upright axis. centrifugal blower wheel in the lower part of said cabinet and passageway alongside of and discharging directly and horizontally to and out through said lower opening so that when said blower isrunning it will pull air down through said passageway and will direct and discharge this heated air horizontally from its blades out said lower opening and, when said blower is'not running, air' will rise up by thermal convection through said lower opening and said passageway and out -said upper opening.

5. A unit space heater comprising an upright, Hoor-supported cabinet containing a combustion heating unit and a contiguous, downwardly-extending passageway forheating air to a high` from its blades out said lower opening and, when i.

said blower is not running, air will rise up by thermal convection through said lower opening and said passageway and out said upper opening. said cabinet having a blower-.driving electric motor positioned safely out of the path of high temperature air, and Vmeans to cool said motor including an opening in said cabinet adjacent said motor to draw relatively cool air past said motor to the suction side of said blower.

6. A unit space heater including an upright, floor-supported cabinet containing -a combustionheating unit and an associated, contiguous passageway for heating air to a high temperature, said cabinet and passageway having an air inlet and having a narrow, substantially horizontallydirected opening across the front portion of the cabinet adjacent to but spaced'slightly above the oor, and fan means having its blades arranged to discharge air horizontally and located in said cabinet and passageway adjacent to and substantially at the level of said opening to pull air through said air inlet and passageway and forcibly eject this high temperature air' out through said opening directly into the room in a wide, thin, substantially horizontal stream spaced above the room floor sufliciently and at a velocity high enough to prevent dangerous local overheating thereof.

7. A unit space heater comprising an upright cabinet with a closed bottom spaced above the door of the room to. be heated by supporting legs, a combustion-heating unit and a contiguous, downwardly-extending passageway for heating air to a high temperature in said cabinet, said passageway and the top of said cabinet having an upper air opening, said cabinet having a long, narrow grille forming substantially horizontally-directed and relatively restricted openings across its front portion adjacent the room floor and immediately above the closed bottom, a

substantially horizontal partition spaced' above said closed'bottom adjacent the top of saidgrille to form aplenum chamber, an upright-axis, centrifugal blower wheel in said plenum chamber under said combustion-heating unit and supported on said closed bottom by vibration-absorbing means, opening means through said partition communicatingthe lower end of said passageway with the central portion of said centrifugal blower so that, during 'operation of said centrifugal blower, it will draw air down through said upper opening, said passageway, and said partition-opening means and discharge it horizontally from its blades to and through said plenum chamber and through the length of said long, narrow grille in a substantially horizontallyr directed, wide, thin stream, or, when the blower is not operating, air will enter said grille and,fol lowing the above path in reverse order, rise by normal. thermal convection out of said upper opening.

8. A unit space heater including an upright, sheet metal casing having an upper air opening, a closed bottom and feet to' space it slightly above the room floor, and a grille forming lateral, substantially horizontally-directed air openings adjacent its bottom, and said casing containing a high temperature combustion-heating unit with a contiguous, upwardly-extending, air heating passageway, the upper portion of` which opens through said-upper air opening, and an uprightaxis, centrifugal blower having its intake communicating with the lower portion of said passageway and positioned under said combustion unit at the level of said lateral openings to horizontally discharge high temperature air directly from its blades to and out said openings in a substantially horizontal, forced stream spaced slightly above the room floor to avoid dangerous overheating thereof. i

9'. A unit space heater including an upright, sheet metal casing having an upper air opening,

.' a closed bottom and feet to space it slightly above the room floor, and a grille forming lateral, substantially horizontally-directed air openings adjacent its bottom, said casing containing a high temperature combustion-heating unit with a contiguous, upwardly-extending, air heating passageway, the' upper portion of which opens through said upper air opening, and an upright-axis, centrifugal blower having its intake communicating with the lower portion of said passageway and positioned under said combustion unit at the level of said lateral openings to discharge high temperature air therethrough in a substantially horizontal, forced stream spaced slightlyabove the room floor to avoid dangerous overheating thereof, and an electric motor connectedto drive said blower and removably carried by said bottom out of the path of heated air, and means including an opening through said bottom to draw cooling air past said electric motor. i

10. A unit space heater including an upright, sheet metal casing having an upper air opening, a closed bottom and feet to space it slightly above the room oor, and a. grille forming lateral, substantially horizontally-directed lair openings adjacent its bottom, said casing containing a high temperature combustion-heating unit with a contiguous,upwardly-extending, air heating, passageway, the upper portion of which opens through said upper air opening, and an upright-axis, centrifugal blower having its intake communicating with the .lower portion of said passageway and positioned under said combustion unit at the level of said lateral openings to discharge high.

temperature air therethrough in a substantially horizontal, forced stream spaced slightly'above the room oor to avoid dangerous overheating thereof; and an upright electric motor carrying the centrifugal lblower on the upper end of its shaft to .form a removable unit therewith, said electric motorv being spaced below said bottom to keep it cool and being carried on a removable plate closing an opening in said .bottom large enough to pass said blower.

11. In a forced air circulating type, unit space heater, a rectangular type, open top cabinet having upright sheet metal side walls and a closed sheet metal bottom adapted to be spaced above the room floor, upright partition means extending from .front to back side walls and from said bottom to adjacent the top of said cabinet adjacent an end thereof to form an open top air passage, said bottom having an opening under said passage, a fuel tank Asupported on said upright partition in said passage, 'horizontal partition means spaced above said bottom to form therewith and with said side walls and upright partition a at plenum chamber, an upright air heating unit supported on said horizontal partition, a flat, upright-axis, centrifugal blower in and discharging into said plenum chamber and positioned under said heating unit, said horizontal partitionhaving an opening communicating said air heating unit to said blower intake, and substantially horizontally-directed air discharge openings through the front sidewall from said plenum chamber.

t 12. In a forced air circulating type, unit space i heater, a rectangular type, open top cabinet havpartition ,in said passage, an electric motor inthe plenum chamber and positioned under said heating unit, said horizontal partition having an opening communicating said air heating unit to said blower intake, and substantially horizontally-directed air discharge openings through the front side wall from said plenum chamber.

13. In a forced air circulating type, unit space heater having an upright cabinet with a closed bottom'spaced slightly above the room floor, means forming an opening from the room into the space below said bottom, a heaterin said cabinet, an upright-axis'centrifugal blower in said cabinet adjacent its bottom, a removable closur'e member carrying said blower and closing an opening in said bottom large enough to permit withdrawal of said blower therethrough, said opening serving as an air intake upon removal l of said closure member and blower.

14. In a unitspace heater or the like, an upright'cabinet having a substantially horizontal l A partition, a iiat plenun'r chamber therein adjecent its bottom, a heating unit in said cabinet above said partition, va long, narrow, lateral grille forming relatively restricted, substantially horizontally-directed openings from said .plenum substantially horizontally-discharging, centrifugal blower located in and discharging hot air trom above said partition into said plenum chamber to build up pressure therein so that hot air is discharged substantially horizontally and directly into the room throughout the length of said grille.

15. A unit spaceheater comprising an upright, cylindrical, sheet metal cabinet having a lower sheet metal bottom secured to and bracing said cabinet walls; and feet extending below said plate to. support said cabinet on the floor of the room to'be heated, a sheet metal partititon secured to` and bracing said cabinet walls closely above said bottom plate to form a flat chamber therebetween, anupright combustion-heatingunit removably supported in said cabinet above said partition plate, said cabinet enclosing a downwardly'- extending air heating passageway contiguous to said combustion-heating unit and open at its upper and lower ends, a substantially fiat, sheet metal top on said cabinet having a grille therein to form an upper opening communicating with the open upper end of said passageway, an integral, stamped grille of upright members across the lower front portion of said cabinet walls forming a long, narrow opening from said flat chamber, an upright-axis, wide, thin, backwardtipped bladed, centrifugal blower wheel positioned eccentrically to the rear in said fiat chamber, an

upright-axis electric motor positioned below said lower plate and carrying said blower lwheel on the upper end of its shaft, and me'ans yieldingly and removably mounting said blower and motor on said bottom.

16. A unit space heater comprising an upright,viioorsuppvorted cabinet containing acombustion air heating unit, means to regulate the fuel supply .thereto including a manual control on said cabinet, means including an upper openvchamber through the cabinet side adjacent its i bottom directly into the room `to be heated, a nat,-

right, floor-supported cabinet containing a combust-ion air heating unit, means to regulate the fuel supply thereto including a manual control .on said cabinet, means including an upper opening and a lower lateral opening in said cabinet to permit upward thermal'convection circulation of air through said cabinet in heat exchangerelation with said combustion unit, ian means kin said cabinet to circulate air downwardly therethrough in reversed thermal convection flow and substantially horizontally out said lower opening, means communicating with the discharge side of saidfan means to supply said combustion unit with air under forced draft during -fan operation, an electric motor driving said fan means, a motor control switch interconnected with said'manual control to energize said fan motor for high fuel settings to give said downward air flow and forced draft to said comingjunit and a fan in said cabinet to force air circulation through said heating passageway,

' said fan. being close to at least one of said combustion air .supply conduits, and said combustion air supply conduit having a cooperating opening 4 facing said fan to supply iorced-draftfrom the fan to said combustion heating unit.

19. In a unit space heater, a floor-supported cabinet enclosing an air` heating unit and having a lower lateral air discharge opening adjalcent to the room iloor, and means including a fan having a substantially horizontal discharge directly from its blades atl substantially the level of said opening to force circulation of air in heating relation with said heating unit and out -said opening directly into the room horizontally in: and a lower lateral opening in said cabil5 directed by the fan blades.

20. In a forced air circulating type', unit space heater having an air heating unit, a floor-supported cabinet enclosing said air heating unit and having a bottom spaced above the room iloor, means forming an opening from the room into the space beneath said bottom, an air circulating fan in said cabinet, an opening'in said bottom largeenough to permit removal of said fan therethrough, and means mounting said fan on said bottom over said opening and permitting I removal of said fan therethrough, said opening serving as a' relatively large, unobstructed, air intake for gravity air circulation when said fan isv removed. I

21. In a forced air circulating, unit, room heater having a iloor supported cabinet enclosing a high temperature combustion air heating 'mit andpreventing overheating thereof by shielding it from said high temperature air.

22. A unit heater for a room or the like comprising a oor supported upright casing, a high temperature combustion heating unit in said cas` ing, a stack for said combustion heating unit, means forming a downwardly extending high temperature .air heating passageway contiguous to and associated with said heating unit, air inlet means for the upper end of said passageway,v

a horizontally directed discharge opening from the lower part of said passageway directly into the room and positioned closely adjacent to but safely above the room floor. a horizontally directed fan below said heating unit and at the level of said discharge opening to provide a forced stream of high temperature air directly from the fans blades out through said discharge opening and across the floor without objectionable overheating of said oor close to theheater.

23. An air circulating space heater comprising a floor-supported housing having an open ulating valve therefor alongside said combustion unit an upwardly-extending. rotary. control shaft to adjust said valve, means forming an air circulating passageway in heat exchange relation-with said heating unit, fan means to force air through said passageway, a motor driving said fan means, and means, including a member carried by said shaft, controlling the energizetion of said motor at an intermediate fuel setting.

1 27. A circulating air heater comprising a combustion air-heating unit, means forming an 'air circulating passageway in heat exchange relation therewith and operable by gravity air circulation, fuel supply regulating means, means to provide a forced air circulation through said passageway, control means therefor, and a common control so connected to said fuel supply regulating means and to said forced air circuupper end, a closed bottom, and a lower lateral' opening, a combustin air-heating unit in said housing, a fan in said housing drawing air in said open upper end, down past said heating unit, and discharging it out said lower lateral opening, and a removable closure member carrying said fan and closing an opening in said bottoml large enough to permit removal of said fan therethrough, means to admit air to said bottom opening, said opening in said bottom serving as an additional air intake opening for gravity air circulation in the absence of said fan and closure member.

24. An air circulating heater comprising a combustion air-heating unit having a stack and operable by natural draft, means forming an air circulating passageway in heat exchange relation n therewith and operable by gravity air circulation. f

fuel supply regulating means, means to supply forced draft combustion air to said combustion unit and to-provide a forced aircirculation through said passageway, control means therefor, and a common control so connected to said circulation is forced.

lation control that as the fuel supply, and hence the heat output, is increased to. an intermediate setting the forced air circulation is started.

28. A unit space heater comprising an upright cabinet containing a combustion-heating vvunit and having meansl forming a contiguous, downwardly-extending, air heating passageway, said combustion unit having an upper flue means and an air supply means including a lower opening to atmosphere to supply combustion air for a moderate fire by thermal convection, said cabinet having means forming an upper air opening for said passageway and having means forming an air opening for the lower portion of said passageway, said lower opening discharging directly into the space to be heated, a driving motor and a connected fan both enclosed in the'lower portion of said cabinet to circulate air in said upper opening, down said passageway, and out said lower opening, said combustion sir supply means including an opening to the discharge side of said fan means to supply a forced draft for a high fire during operation of said fan means, said parts being arranged so that, upon nonoperationof said fan means, air may enter said lower opening and rise through said passageway and out said upper opening by normal thermal convection.

' 29. A circulating air heater comprising an upright cabinet, a combustion heating unit therein,

means forming an upwardly-,extending air circulating passageway in heat exchange relation there th and operable by gravity air circulation, sai cabinet having an upper and a lower openingl for said passageway, means to supply combustion air to said heating unit by gravity circulation, fan means adjacent said lower opening to causev a flow of air downthrough` said pas- 25. A heater comprising a combustion heating unit, a stack therefor, means to supply combustion air thereto by gravity circulation, means to supply combustioxrair thereto under forced draft. and control means therefor, infinitely variable fuel supply regulating means, and a common control means connected to said fuelsupply regulating means and tosaidforced draft control means so that for low fuel settings combustion is by gravity air circulation only and for higher fuel settings combustion is by forced draft.

` prising an upright, floor-supported cabinet, a

sageway and directly out into the space to be heated, and means forming a passageway from,

the discharge side of said fan means to said combustion heating unit to supply forced draft combustion air thereto. only during operation of said fan means.

.' 30. In a forced air circulating type unit space heater having an upright cabinet, an'upright air heating combustion drum unit therein, a closedv bottom for said cabinet adapted to be spaced labove the room floor, a wide partition meansspaced close above and substantially parallel to said bottom forming therebetween a wide fiat ing restricted openings directly from said plenum chamber into the space to be heated. and means combustion air-heating unit therein, a-fuel reg- 76 to force air from said air heating unit into' said plenum chamber under a slight pressure for charge through all of said restricted openings.

31. Inra unit space heater or the like, an upright cabinet having means forming a fiat plenumhot air from adjacent said heater directly intol said plenum chamber to build up a slight pressure only in said plenum chamber so that said hot air is discharged therefrom throughout the length of said grille and from all of its openings.

32. A unit's'pace heater comprising a floor supported cabinet having a lateral opening adjacent theroom iioor,l aA fuel burner and an associated expansion chamber in said cabinet, and means including a vertical axis centrifugal blowerbelow said expansion chamber at the level of said opening and having ja substantially horizontal c discharge directly from its blades 'to pull air in heating relation with said expansion chamber and discharge it horizontally to and out through said opening into the room to be heated.

33. In a direct flred type, unit space heater, 'an

upright cabinet having a closed bottom adjacent the room iioor and having a lateral opening`ad` jacent said bottom,'a combustion heating unit in said cabinet, and an upright-axis centrifugal blower wheel in said cabinet adjacent said bottom and discharging substantially horizontally and directly to and out said opening directly into the room to produce astream directed horizontally by the blades ef said blower wheel.

34. An air circulating unitspace heater comprising a floor-supported cabinet having an open heated will be into said bottom'opening, up said passageway, and out said open top, and means to pull airdownwardly inaidpassageway and force it directly into thevroom to `beyheatedin a'low level, .substantially'horizont-al stream, including a lateral discharge opening adjacent the room'iioor. and 'a' blower unit positioned-in said bottom opening below said expansion chamber and being removable from beneath said cabinet, said vblower unit comprising a driving electric motor and an adjacent, coaxially coupled, upright axis centrifugal blower at the level oi' said discharge opening *and having a substantially horizontal discharge directly from its blades through said discharge opening .and into the room tobe heated. l

35. An air circulating unit space heater comprising a door-supported cabinet having fan open topand a bottom opening and an upright front wall with a lateral opening therein adjacent to and spaced safely slightly above the' .room floor.

- said cabinet containing a fuel burner, Ian expansion chamber therefor above said lateralopening.

andassociated meansforming an upright,'open ended, ain-heating passageway so that there will ybe a natural A'gravity circulation or air being heat Y ed in through said bottom opening, up said passageway, and out said open top, a blower unit removably positioned in said bottom opening belowsaid expansion chamber and being removable' from beneath said'cabinet to pull air downwardly in said passageway and to force it'l directly from said lateral opening into the room'to be heated idal low level.; substantially horizontal stream.

said blower unit `comprising anupright-axis centrifugl blower at the level yof saiddischarge opening andhaving'a substantially horizontal dischargedirectly from its blades through said discharge opening intothe room to belheated, and

'. a coupled, coaxial, blower-,driving electric motor top and a bottom opening, s'aid cabinet ,containing 40 a iu'el -burner ,andan upright expansion cham, ber therefor,'and means forming an rassoc upright and open ,ended air-heating Way whereby natural gravity circulation .ofi alir under said blower and positioned'out -ot the path of the hotaair to. prevent. overheating thereof.

EUGENE. r'. Panam.

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