Abstract: A highly efficient indoor heating system and device is described. The device is equipped with an internal chimney, as well as vents that are configured to maximize the draft applied to the flame housed within a stove combustion area. The heater is configured to reach temperatures exceeding 300 degrees Fahrenheit in approximately ten minutes. A gravity fed fuel tube, potentially in communication with a wood pellet hopper, is configured to deliver fuel to the stove of the heater. Heat is distributed throughout the structure of the device, and a convection chamber within the device ensures that heat generated is not quickly lost via exhaust.

Abstract: A treatment device for treating food products with conditioned air comprises a housing which delimits a treatment space and is provided with an entry and an exit, at least one conveying device for conveying the products from the entry throughout the treatment space to the exit, the conveying device between the entry and the exit following a conveying path with several windings which are situated one above the other, air-circulation device for circulating conditioned air throughout the treatment space via a hollow drum. According to a first aspect, air-conditioning device are provided upstream of the air-circulation device for conditioning the air. According to a second aspect, at least one winding of the conveying path near the entry has a pitch which is different to the pitch of the downstream windings.

Abstract: A forced air heater that includes two air moving devices for improved control of air and fuel mixture for combustion, and improved air flow the heater. In addition to better air flow, the heater includes an improved fuel system that utilizes a pump and delivery controls to accommodate reduced air flow while avoiding incomplete combustion and fume odors.

Abstract: The invention relates to a hot air internal ignition burner/generator comprising an injection device used for producing a high-speed fuel gas mixture stream and for injecting said stream into the burner head (2) which is tabular-shaped and comprises in-series arranged therein a pressure recovery chamber (10), an igniting chamber (11) and simple or multiple diffusion means (24) which are fixed inside the head (2), where two chambers are jointed, wherein said diffusion means (24) comprise a central orifice provided with an igniting tube which penetrates therein and axially extends inside the pressure recovery chamber (10) in such a way that it defines the ignition chamber (43) provided with igniting electrodes (42) connected to the pressure recovery chamber (10) of the burner (2) via a calibrated orifice (46).

Abstract: The present invention includes a frame that is quickly and easily assembled and disassembled. The frame may be used for supporting a portable forced air heater, or other similar equipment. Handles, supports, and optionally a wheel assembly is assembled to two core members using snap lock buttons. In a preferred embodiment, the portable forced air heater includes a maintenance clock for measuring and recording operational parameters of a portable forced air heater, and for notifying a user that maintenance is required.

Abstract: An impinging air duct that comprises one or more ramps disposed within. The ramps direct air entering the duct through columnating orifices, and helps to provide an even flow of air out of the orifices, along the length of the duct. The angle of the ramp and the location of the ramp within the duct can be adjustable.

Abstract: The present invention includes a frame that is quickly and easily assembled and disassembled. The frame may be used for supporting a portable forced air heater, or other similar equipment. Handles, supports, and optionally a wheel assembly is assembled to two core members using snap lock buttons. In a preferred embodiment, the portable forced air heater includes a maintenance clock for measuring and recording operational parameters of a portable forced air heater, and for notifying a user that maintenance is required.

Abstract: An elongated generally cylindrical shell of a portable gas forced air unit is provided with a roll cage for protection. A pair of end caps located at each proximate end of the shell are connected by a plurality of roll cage bars extending parallel with the combustion chamber, whereby, the combination of end caps and roll cage bars serve to protect the concentric shell and its internal combustion chamber from damage. The end caps include a plurality of end bumps dimensioned and located to protect the outer extent of the portable unit while being oriented in substantially vertical or horizontal positions, and serve to support the portable unit when in a vertical position on a surface. The portable gas forced air unit is also adapted to be releasably interconnected with similar units.

Abstract: A wood burning furnace having an enclosed combustion chamber including a top, a bottom, a back, a front and opposing side walls and a secondary combustion air admission chamber including a top, a bottom, a back, a front and opposing side walls, the bottom wall of the secondary combustion air admission chamber being arched and perforated, the bottom wall of the secondary combustion air admission chamber forming at least a portion the top wall of the combustion chamber

Abstract: A wood burning furnace having an enclosed combustion chamber including a top, a bottom, a back, a front and opposing side walls and a secondary combustion air admission chamber including a top, a bottom, a back, a front and opposing side walls, the bottom wall of the secondary combustion air admission chamber being arched and perforated, the bottom wall of the secondary combustion air admission chamber forming at least a portion the top wall of the combustion chamber

Abstract: A gas fireplace insert structure having a firebox formed to direct flue gases reaching the upper section thereof through a folded path to flow forward and upwardly and then return rearwardly to an exhaust opening, and a casing formed to provide a room air circulating path around the firebox, the circulating room air path including a folded path portion disposed within and following the fold of the flue gas path.

Abstract: The space heating system has a stove (1, 2) with a sealed combustion chamber (3); air is heated in the stove in a heat exchanger (12) therein, and heated air is conducted through hollow blocks (80) of chamotte arranged, for example, as heating panels, heated walls, benches, floors or the like. The hollow blocks are formed, internally, with projections or obstructions (83) to increase heat transfer, and may be faced at the outside with decorative tiles. To seal the combustion chamber, a vertically movable panel, typically of fire-resistant glass, is slidably located in front of a fuel inlet opening (7). In operation, the panel is sealed, so that the combustion chamber (3) will receive air only under controlled conditions, in two air paths; a primary air path supplies air to a narrow space (22) below a fuel support grate (25), after being preheated by passing around an ash receiver (18); and a secondary air flow, passed through ducts (30) within the combustion chamber, and ejecting air towards the panel.

Abstract: A pellet stove has an arrangement for improving the flow of air therethrough. Air entering the stove is split into first and second portions. The first portion is diverted upwardly through a combustion chamber, wherein pellets are burned, thereby aiding in the burning of the pellets. The first portion of air then exits from the combustion chamber. It is directed to a rear of the stove through a heat exchanger where a flue exhaust is located. The second portion of air has three parts. The second portion of air is simultaneously diverted upwardly around the hopper and auger mechanisms, whereby the mechanisms and the pellets therein are cooled. One part of the second portion of air then is received in the flue exhaust so that this one part of the second portion of air exits the stove, creating a negative pressure in the combustion chamber.

Abstract: A solid fuel burning stove is provided and includes a housing within which a combustion chamber is located. The combustion chamber receives combustion air via an adjustable inlet formed through a channel member running along the base of the housing. The channel member defines a combustion air duct which communicates with a combustion air intake in the rear wall of the housing. Combustion air is drawn into the stove via the air intake and is forced through the combustion air duct by a fan. The combustion air passes through the adjustable inlet into the combustion chamber. A fire box is located within the combustion chamber above the adjustable inlet and holds the solid fuel to be combusted. Hot flue gases heat air flowing through a plurality of heat exchange tubes passing through the combustion chamber. The heated air flowing through the heat exchange tubes is directed into the room in which the stove is located via a plurality of vents in the front wall of the housing.

Abstract: The invention relates to a heating device.A first object of the invention is to embody a heating device with a combustion space having at least one free side, such as an open hearth, or optionally a free-standing heater, such that it possesses a high yield. Another object is the embodying of this heating device such that in addition to use as a free-standing heater it can also be used as insert system for an open hearth. These objects are realized with a heating device characterized by a tilted, substantially U-shaped heat exchanger open to the front for heating air at the fireplace. This heat exchanger being provided with a lower heat exchanger part onto which can be laid solid fuel. For example, a number of pipes laid adjacent to one another, which lower part connects onto a standing heat exchanger part. For example, a number of pipes located at an interval from one another, such that the heat exchanger bounds the combustion space.

Abstract: A stove with a continuously open draft provides a fire chamber peripherally configured to cause circular motion of burning gases therein to provide substantially complete combustion of fuel. A continuously open elongate draft vent is positioned above and immediately inwardly of a door window to aid cleaning of that structure and to reinforce the circular motion of combustion gases. Baffles and exhaust dampers also are configured to aid the circular motion of combustion gases in the fire chamber. Heated surfaces defining the upper fire chamber walls catalyze the combustion reaction and rearward surfaces reflect radiant energy back into the combusting fuel to further aid combustion.

Abstract: An improved coal stove grate including a floor and side walls to either side of the floor. Coal is pushed along the floor, up a rise surface, past a crest at the end of the rise surface and along a fire support section to the end of the grate. Part of the coal forced up the rise surface rolls back to fill a reservoir space in the grate and fuel a fire extending the full length of the grate during heating and a stable long-burning fire during turndown of the stove.

Abstract: A self-contained, free standing, on-demand, woodburning furnace including a firebox (52), including means to force combustion gases through a manifold (68), a hot air gathering plenum and means to selectively force feed the fire (34, 36, 38, 40, 68) and draw heated air from the furnace (8, 10, 12, 14).

Abstract: The present invention provides a wood burning stove having an internal damper plate located between first and second combustion chambers within the stove. The damper plate is movable between a chamber dividing and a chamber joining position where the damper plate provides a smoke guide to the interior of the stove allowing the stove door to be opened when the stove is in use.

Abstract: Stove for burning solid fuels, particularly wood. The stove has a pedestal which has a primary air inlet and an ash drawer; an upright rectangular main housing which is divided internally into a fire box section and a section for combustion products; a housing for electrical components on the back of the main housing; and a flue. The partition between the fire box and the top portion has a first passageway with a catalyst therein and a damper-controlled bypass passageway. Primary air is admitted beneath the grate and passes upwardly therethrough. Secondary air is admitted to the fire box near the glass-panelled charging doors for solid fuel. The stove has a catalyst chamber for completing combustion of the incompletely burned gases in the fire box.

Abstract: A heater for combustion of carbonaceous fuels comprising a casing which surrounds and contains the fuel immediately prior to and during combustion and a heat exchanger of unique design which is positioned within the casing. The efficiency of the heater may be increased by providing an improved system for supplying pre-heated secondary air for more complete combustion of partially combusted fuel in the general vicinity of and/or within the heat exchanger. The heater may be of the self-feeding type for combustion of solid fuels such as wood and, in this embodiment, preferably the casing is generally cylindrical and the heat exchanger is approximately centrally located within the casing whereby it extends generally along the casing axis and is spaced a substantial distance from the casing wall.

Abstract: A solid fuel heating apparatus has combustion air supplied in a controlled manner by a manifold. The manifold has a first branch that directs combustion air to the interior of the fuel ignited within the firebox and a second branch that extends along the forward edge of a baffle that extends from the rear wall of the firebox across a flue. Air issuing from the second branch is directed towards the fuel within the firebox so that a bodily rotation of gases within the firebox is obtained. A third branch extending generally parallel to the second branch is also provided and directs air towards the first branch. The air delivered by the second and third branch is roughly twice that delivered by the first branch and it has been found that this provides complete combustion of the fuel within the stove.

Abstract: A wood burning furnace, positionable exterior to a home or trailer utilizes an improved heat exchanger with a chimney stack extending downwardly into the heat exchanger chamber to prolong the time interval in which smoke stays in the heat exchanger. A creosote removal blade is slidably mounted within the chamber to scrape creosote deposits from the inner periphery of the chamber and to direct it downwardly into the fire box for subsequent burning.

Abstract: A stove and method for burning solid fuels having an insulated primary combustion chamber, uniform distribution of preheated primary air through upward facing holes in a grate, downward flow of combustion gas through the grate, retention of hot coals in the grate structure, preheated secondary air, individually controlled primary and secondary air flows, insulated vortex combustion chambers for secondary combustion, longitudinally finned tubes as a first stage heat exchanger, plate-fin assembly as a second stage heat exchanger, an induced draft fan to draw the air and combustion gases through the combustion chambers as well as the heat exchangers, and a forced air fan to blow cool room air through the two stage heat exchanger.

Abstract: A jacketed wood burning stove of the type having an inner firebox door and an outer jacket door in front of the firebox door and wherein a flash inhibitor is provided consisting of a relatively small auxiliary firebox door which is manually biased open but is held closed by an engaging bracket on the outer jacket door when the outer jacket door is closed.

Abstract: A stove for burning solid fuel such as firewood. a lower level air inlet opening is provided for so-called "primary air," and another air inlet opening is provided at a higher level for so-called "secondary air." The volume of air introduced into the stove from each inlet opening is separately controlled. An air metering means controls the amount of secondary air introduced into the stove through the higher level air inlet opening. The lower level air inlet opening and the air metering means both have a finite number of predetermined, fixed air transmitting conditions and no other air transmitting conditions. The lower level air inlet opening has preferably two predetermined, fixed air transmitting conditions--a maximum and a minimum. The air metering means has at least a predetermined, fixed maximum air transmitting condition and preferably also a predetermined, fixed minimum, transmitting condition. The level at which the two air inlet openings are located is specified.

Abstract: A circulating air wood burning heating stove/fireplace combination has a combustion chamber that is in the form of a shell defined by inner walls of the stove and a rearwardly disposed air outlet manifold. Spaced outer auxiliary back and top walls and the corresponding shell walls form therebetween air passages through which ambient air is recirculated into the room over the manifold. The manifold is provided with a plurality of spaced heat conductive metal strips disposed about its periphery. Several manifold embodiments include one or more finned air heating conduits which extend therethrough. A blower fan or pair of blower fans are used to circulate air through the air passages and in heat transfer relationship to the manifold. A valve, damper, and linkage control arrangement regulate the heat output and may be used upon starting of the fire to clear a column of cold air from the flue.

Abstract: A circulating air wood burning heating stove/fireplace combination has a combustion chamber that is in the form of a shell defined by inner walls of the stove and a rearwardly disposed air outlet manifold. Spaced outer auxiliary back and top walls and the corresponding shell walls form therebetween air passages through which ambient air is recirculated into the room over the manifold. The manifold is provided with a plurality of spaced heat conductive metal strips disposed about its periphery. Several manifold embodiments include one or more finned air heating conduits which extend therethrough. A blower fan or pair of blower fans are used to circulate air through the air passages and in heat transfer relationship to the manifold. A valve, damper, and linkage control arrangement regulate the heat output and may be used upon starting of the fire to clear a column of cold air from the flue.

Abstract: A wood burning stove comprises top and bottom portions and unitary metal side panels having inwardly extending manifold sections running from the rear of the stove towards the front. Each said manifold section is formed by bending the metal to form a channel which lies wholly inwardly of the outer plane of each such panel, a unitary rear panel having an inwardly extending manifold section across the rear of the stove. The side manifolds extend from the front to rear of the stove, the end of each manifold being closed. There is an opening in the rear portion of each said side manifold and an opening in each end of said rear manifold, said openings in the side manifolds being aligned with the openings in the rear manifolds to permit passage of air from the rear manifold to the side manifold.

Abstract: A solid fuel burning heater with improved efficiency in burning logs. A housing is divided by a louvered internal wall into front and back sections having combustion and heating chambers respectively. The louvered wall terminates below the top of the housing providing a crossover space through which hot, combusted gases flow from the combustion chamber to the heating chamber. A vertical heat transfer duct extends through the top and bottom of the housing and has open ends in free communication with external ambient air. Front and rear flues are connected to the combustion and heating chambers and these are interconnected by a main flue leading to a chimney. A damper is provided in the front flue. The combustion chamber comprises a primary combustion zone on a fuel-supporting grate and a secondary combustion zone above it. Adjustable draft openings at the front of the housing control air input to the combustion zones.

Abstract: Disclosed is a wet-based, wood-burning boiler that has a combustion chamber that heats water in a cylindrical main boiler chamber and in a communicating rear boiler chamber. A flue directly exhausts smoke, flue gases and products of combustion from the combustion chamber without creosote formation, while a damper plate, tracked to its closed position: indirectly exhausts without lowering the temperature of the exhausting flue gases to creosote deposition temperature because the damper plate structure has a more effective draft area than the flue draft area, while at the same time the damper plate structure retains the highest temperature possible in the combustion chamber, and traps and transfers heat to the water in the boiler chambers more quickly and with a faster recovery rate.The wet-based, wood-burning boiler can be converted to a wood-burning, forced, hot-air furnace while retaining its tracked damper plate structure and functional attributes associated therewith.

Abstract: Heater apparatus is disclosed having a metal firebox in which fuel is burned and an outer ceramic enclosure having ceramic mass walls which absorb excess heat when the heater produces more heat than is required and distributes the heat gradually by radiation after the heater output becomes less than the heat stored in the ceramic mass. The ceramic mass walls are spaced from the metal firebox walls to provide air passages through which air may be circulated by means of a blower so that rapid heating may be had of the interior space when the firebox is initially fired by transferring the heat radiated from the metal walls directly into the room by forced convection. After the interior space is heated to a desired temperature, the blower may be cut off and the room may be heated more slowly at a more even temperature by radiation from the ceramic mass.

Abstract: A housing is provided defining a closed lower combustion chamber and a closed upper afterburn chamber disposed immediately above the combustion chamber with one marginal portion of the combustion chamber projecting horizontally outwardly beyond the corresponding marginal portion of the afterburn chamber. A combined flue gas and bypass chamber is disposed above the one marginal portion of the combustion chamber and is horizontally registered with the afterburn chamber. Partition structure divides the combined flue gas and bypass chamber into central and remote end portions spaced along the aforementioned one marginal portion and a pair of first ports communicate the remote portions with adjacent underlying upper portions of the combustion chamber, a pair of second ports communicate the remote portions with adjacent portions of the afterburn chamber and third port structure communicates the central portion of the afterburn chamber with the central portion of the combined chamber.

Abstract: A jacketed wood stove has a jacket forming an air space conformably surrounding the top, bottom, rear and sidewalls of the firebox, and a double-jacketed front access door. The periphery of the access door is slotted for internal convective cooling of the door. Ambient air enters the air space beneath the firebox, flows rearwardly, then upwardly behind the firebox and forwardly along the top and sidewalls of the firebox to progressively heat the air and to cool the outer jacket. A reflective intermediate baffle between the jacket and the side and rear walls of the firebox further cools the jacket. Heated air returns to the room via sidewardly-directed outlet slots along the upper and frontal margins of the jacket sidewalls. A pedestal supports the jacketed firebox above the floor. The pedestal contains a first conduit for introducing ambient air into the air space and second conduit for introducing outside combustion air into the firebox. The pedestal also houses a blower for blowing air into the air space.

Abstract: The present invention relates to a parabolic shaped heater comprising a parabolically shaped lower wall structure enclosed by a horizontal heat collector panel, and wherein this enclosure defines a generally closed firebox for supporting fuel in the form of wood, coal and the like. Further, there is provided a hood that is suspended about an upper portion of the firebox and extends generally downwardly therearound, and is spaced outwardly therefrom such that air may be induced upwardly between the parabolic firebox and the hood, and over the heat collector panel so as to effectuate an efficient heat transferred between the firebox and the passing air. Finally, a central heat distributing system may be operatively associated with said hood for directing air therefrom to other parts of the structure housing said parabolic heater.

Abstract: This wood by-pass furnace is designed in such a manner, as to have the oxygen for combustion controlled, to the extent that the wood does not blaze, but only produces red, glowing coals for heating a home, and the outside cover will not burn anyone when touched. It primarily consists of an inside fire chamber of cylindrical shape, to distribute heat to the top, and it includes a top baffle, that extends from the front of the fire chamber, to the rear of the furnace. It further includes two side baffles, to protect the sides of the heat chamber, and smoke and heat travels up and over the top of the top baffle, to the front of the stove or furnace, and passes out an eight inch pipe. The top baffle further serves to condense the black smoke into liquid, which will dry out and will burn in its dry form.

Abstract: A solid fuel burning modular stove fabricated from a plurality of metal assemblies includes a first assembly provided with a combustion chamber, an air duct at the lower front of the chamber communicating with the ambient air, a louver member inside the air duct varying the degree of admittance of air through the duct, flue pipe means for exhausting combustion products from the stove, a plurality of fire brick lining the floor, rear and side walls. Vertical ducts are positioned along the rear and side walls having inlet openings at their bottom and outlet openings at their tops, heated air rises through the ducts and discharges into the ambient air. A second assembly to be attached to the bottom of the first assembly comprising horizontal channel means in communication with the vertical duct inlets providing a blower to force outside air through the vertical ducts.

Abstract: A furnace for firing with optional fuels and where the substantial heat transfer takes place from air to air, whereby the furnace (1) is provided with double shells, which in the space therebetween present partition members (10) which subdivide the space in at least two zones (2,3) through which air is forced by at least one blower (6) from an inlet at one end of the furnace, via a first one of said zones and thereupon via the second one of said zones to an outlet (5) at the same one end of the furnace, whereby the air is brought carefully to flow around the combustion chamber shell.

Abstract: An efficient space heating stove having a combustion chamber substantially completely enclosed with insulating firebrick whereby the operating temperatures within the combustion chamber can be maintained above the ignition temperature of the fuel being consumed. Combustible gases liberated by the wood fuel are burned as they pass through a perforated, hollow, tubular member located within the combustion chamber and through which the combustible gases must pass before they are exhausted from the stove. Fuel within the combustion chamber is efficiently burned before useful heat energy is extracted.

Abstract: The combination stove has a fire chamber that is partially cylindrical including a side loading door for loading wood or other combustible material such as coke or coal into the fire chamber. The front of the stove may be opened to enable viewing of the wood or coal burning in the stove by means of an arcuate sliding door that is operable to substantially totally close the chamber or open a section of the front thereof for viewing purposes. The sliding door is covered by a window construction including a tempered glass face. The stove is provided with an open base for supporting the chamber in a shroud covering the top and back of the chamber, preferably including blower means associated therewith. Particularly for wood combustion, the chamber is provided with a top draft extending longitudinally of the chamber and has supported therein a grate.

Abstract: A slow combustion stove is disclosed. The stove comprises a stove body adapted to receive fuel, such as wood, on the bottom to form a fire bed, an adjustable air intake for admitting air into the stove body, an exhaust duct, a smoke outlet located adjacent the top of the furnace body and communicating with the exhaust duct, a smoke flue located adjacent the bottom of the furnace body and also communicating with the exhaust duct, and damper means permitting exhaust of the combustion gases through the smoke outlet during starting of the fire and through the fire bed and the smoke flue when the fire is well lit to ensure maximum fuel and gas combustion.

Abstract: A heating device for consuming a combustionable fuel, having an internal combustion chamber with top, sides, ends, and a grate forming the bottom; an outer shell, having a top, sides, ends, and a bottom in spaced relation below the grate; a primary air supply adapted to distribute the air beneath the grate; a secondary air supply adapted to preheat the secondary air prior to entering the combustion chamber at a location above the grate; an axis door in one end suitable to pass fuel within the combustion chamber; an exhaust chamber between the combustion chamber and the outer shell adapted to extend across the top and at least partially down a side in fluid communication with the combustion chamber; an exhaust port adapted to exhaust the combustion gases from the exhaust chamber externally of the device; a damper adapted to selectively divert exhausting gases in the exhaust chamber at least partially down one side, to extend the distance travelled by the exhausting gases to improve secondary combustion and the

Abstract: A heater stove which fits into a fireplace, the heater stove comprising a cylindrical firebox having (a) a front face, a back face, and a side wall, with a first closed-curve cross-section, extending between the front face and the back face and (b) an axis directed into the fireplace when the heater stove is within the fireplace; an outer cylindrical shell having a side wall with a second closed-curve cross-section and a back wall, the shell surrounding and being spaced apart from the back face and the side wall of the firebox, the side wall of the shell and the side wall of the firebox having a gap therebetween the gap including an opening at the front of the stove; and means for angularly dividing the gap proximate the opening into a plurality of regions which extend a short distance in the axial direction between the firebox side wall and the shell side wall, the regions including at least one lower region into which unheated air is drawn and at least one upper region from which heated air exits, air drawn

Abstract: An improved wood burning stove for providing heated air to a room or similar area includes an enclosed fire chamber, a hearth at the bottom of the fire chamber, draft inlet means at the front of the fire chamber and a flue at the rear of the fire chamber. Within the fire chamber is an enclosed air chamber having lower and upper portions; the lower portion communicates at the bottom of the stove with the ambient air and extends upwardly adjacent the rear wall of the fire chamber to a point below the flue, where it joins with the upper portion. The upper portion of the air chamber extends upwardly toward the front of the fire chamber at an acute angle with the horizontal, preferably between five and twenty-five degrees; at the forward end of the upper portion the air chamber communicates with one or more air pipes which extend to the front of the stove and there open to the ambient air.

Abstract: A wood burning stove is formed with double front and rear side walls of heat conductive metal spaced apart by heat conductive spacer fins and providing air passageways by which room air is heated by conduction from the walls which are heated by the burning of wood deposited on a firebox floor supported in heat conducting relationship with the inner side walls. A catalytic converter is disposed over the fire area in the upper portion of the stove, and is arranged to receive preheated fresh secondary air which mixes with hot, incompletely combusted compounds from the fire and, in the presence of the catalyst, induces a secondary combustion of the substances. This mixture is channeled into a heat extraction chamber where the secondary combustion is completed and the resultant heat is transferred to the metal body of the stove. An exhaust passageway is provided for releasing the products of complete combustion into the atmosphere.

Abstract: A stove for burning solid fuel such as wood, coal or briquets in a more efficient manner utilizes preheated outside air for primary and secondary combustion and has tempered glass windows for observation. The combustion air flow is directed so as to minimize obscuring of the glass by deposits of unburned volatiles. A fire chamber is provided with self-feeding grate, and the stove also has a secondary grate, a high proportion of radiating and convective surfaces, a heat exchanger, a cooking surface, an automatic linkage between a fuel loading door and an opening-reducing damper to limit back drafts and thermostatic control to ensure complete combustion and efficient heat exchange. The self-feeding grate has a thermostatic grate shaker to promote unattended complete combustion, and can be replaced to match the fuel used.

Abstract: A circulating air wood burning heating stove/fireplace combination has a combustion chamber for burning fuel. The combustion chamber is in the form of a shell defined by inner walls of the stove and a rearwardly disposed air outlet manifold. Spaced outer auxiliary back and top walls and the corresponding shell walls form therebetween air passages through which ambient air is recirculated into the room over the manifold. The manifold is provided with a plurality of spaced heat conductive metal strips disposed about its periphery. An air inlet is provided at the bottom of the back air passage and an electric fan or blower is attached to the inlet to force air into the back air passage.

Abstract: A high efficiency, air-tight wood stove having a firebox with front, side, rear, top and bottom walls, primary air introducing means for admitting combustion air into the firebox, air flow means adjacent the bottom of the firebox for directing a flow of air upwardly across at least one firebox wall, at least one supplemental air inlet for diverting a portion of the air from the air flow means into the firebox, fan means for forcing air through the air flow means and through the supplemental air inlet, the size of the primary air introducing means being chosen to automatically restrict the combustion in the firebox if the fan means stops to maintain the temperature of the stove and surroundings at safe levels.

Abstract: A wood and coal burning heating unit is provided for heating a residential building or the like. The unit includes a firebox having a double wall on its rear and top sections, with the back chamber and top chamber, which are formed between the respective double walls, being connected in flow communication. Air is blown into the back chamber, flows through the back chamber and top chamber and is expelled through a substantially horizontal, rectangular opening at the front of heating unit. A plurality of elongate, upstanding fins are provided in the top chamber so that the air flowing through the top chamber flows along the upstanding surfaces of the fins. Heat is conducted through the fins from the inner top wall of the firebox and is then transferred from the fins to the air flowing along the surfaces of the fins.

Abstract: A cylindrical wood-burning firebox is surrounded by a cylindrical metal outer shell which together comprise a convection heater stove which fits into any of various sizes of fireplaces with the cylinder axes directed into the fireplace. Room air enters the lower front portion of the stove between the firebox and the outer shell, is drawn toward the rear of the heater stove, rises between the firebox and the outer shell as the air is heated by the firebox, and exits as hot air from the upper front of the stove between the firebox and the outer shell. The front face of the firebox is recessed relative to the outer shell. A coil through which a fluid can flow can be provided in the gap between the firebox and the outer shell, said coil having an axis also directed into the fireplace.