Abstract: A wood heater having an elongated cylindrical firebox with a door access at one end. A secondary heat chamber is located on a top side of the firebox, interconnecting the firebox to a flue adapter ring. Hot combustion gases are directed from the firebox through the second heat chamber to the flue adapter ring. A heat exchanger is positioned above the firebox within the heat chamber to extract heat from the burning gases and to direct the heat outwardly of the firebox and into the adjacent room. A window case protrudes from one side of the firebox and includes a glass pane for viewing the fire. The window case includes a shutter plate assembly that selectively closes off the fire from view through the window. The shutter plate has the additional function of directing ventilation air from the window vent aperture to cool the glass within the window case, protecting the glass pane from excessive heat, and preventing build-up of soot along the inwardly exposed surface thereof.

Abstract: A forced air heating unit having a first U-shaped air channel with inlet vents adjacent the front, and a second U-shaped forced air channel interior said first forced air channel communicating with the first forced air channel via an opening in the common rear wall and having exit vents adjacent the front. A fan is mounted to the rear wall having the motor exterior the forced air channels with an impeller in the common rear wall opening. A conical deflector extends from the interior wall of the second forced air channel towards said rear wall opening. A refractory floor in the firebox includes front, side and rear vertical portions with top surfaces inclined towards the respective wall. The rear and side vertical portions exceed the height of a grate or andirons positioned on the refractory floor.

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 fireplace and room heater that makes use of both natural air convection and forced air principles to efficiently heat an adjacent room. The fireplace and heater is freestanding and includes a firebox that is enclosed on three sides by a shell. The shell forms an air space between its walls and the firebox that is used for passage of air. A bulkhead separates the space into two distinct plenum chambers, an upper chamber and a lower chamber. A blower is provided at the rear of the unit. An intake of the blower opens into the lower plenum chamber. A discharge of the blower opens into the upper plenum chamber. Air is drawn through the lower plenum chamber by the blower and is forced outwardly through the upper plenum chamber through the blower discharge. The blower is controlled by a rheostat and thermostat to facilitate selective adjustment of air flow through the unit.

Abstract: A rectangular stove structure has a stepped top with a sloped intermediate top portion having heated air outlets. Room air is passed through U-shaped ducts arranged along the inside surfaces of the stove side walls, and firebrick is provided on the floor of the stove structure between these ducts. Air is drawn into the ducts through a side opening which may have a blower and conduit associated therewith. The door of the stove has rotary combustion air inlets, and a baffle plate is provided inside the door to provide primary air for the fire, and secondary air for improving air circulation and ventilation inside the stove. Domestic hot water can be heated at the rear of the stove structure in an annular chamber defined for this purpose at the connection for the exhaust gas flue. Domestic hot air can be supplemented by a plenum provided on the lower front top, and the plenum receives heated air from the outlets in the sloped intermediate top portion.

Abstract: A fireplace stove includes a sheet metal fire box of octagonal vertical cross-section incorporating on its front side a sheet metal front window assembly including a tempered glass window with a sliding shut-off plate insertably mounted just behind the window and between the glass window and a convection draft area formed by a horizontal draft channel which underlies the front window assembly. A draft slide bar underlies a fixed grill within the front window assembly box frame above the glass window and between the window and the fire box. A motor driven fan supplies air within an air flow passage defined by the backsplash plate vertically mounted to the stove and the rear of the stove to cause forced air flow upwardly between the vertical rear wall of the fire box and the backsplash plate to effect heat transfer by convection and downwardly within an air flow channel defined by the bottom horizontal walls of the fire box to maintain the floor which underlies the fireplace stove relatively cool.

Abstract: A heated air circulator adapted to be placed against a radiant-type heating stove. The housing of the circulator, which defines a chamber therewithin, includes upright back and side walls which are unjoined along their adjacent upper edge portions. A plurality of spaced-apart, transverse fold lines on the back and side walls, where the same are unjoined, permit portions of these walls to be folded over to form a chamber top at a height conforming to the height of the stove. The circulator includes a damper regulated by a temperature-responsive spring whereby flow of unheated air into the chamber increases as the temperature within the chamber increases.

Abstract: A maximum efficiency stove or furnace for heating homes or other buildings. The stove includes a primary combustion area for burning a primary fuel, such as wood, and secondary combustion areas for burning the gases of combustion after they leave the primary combustion area. The combustion chambers and areas are at least partially surrounded by air heating enclosures through which ambient room air is forced, preferably by a fan, for heating. Air for sustaining combustion is preheated in a preheating chamber and fed through separate intakes to both the primary and secondary combustion areas. A single draft control is provided to control air flow through the preheating chamber and to simultaneously control the flow of preheated air to and through both said primary and secondary combustion air intakes.

Abstract: A wood burning stove, a free standing fireplace or fireplace insert is constructed to receive one of three possible types of inserts to make the unit adaptable to a convection, hot air or hot water heating system. The wood or like fuel combustion rate is automatically controlled by a temperature sensor and draft control system. The insert may be a baffle structure, an air to air heat exchanger or an air to water heat exchanger.

Abstract: A stove having a combustion chamber surrounded by four sides and a top and having a warm air conduit extending between opposite sides and opening outwardly of at least one of the sides. Where the stove is to utilize natural convection, the conduits open outwardly of both the sides of the enclosure. An opening is provided in the top or bottom of the warm air conduit remote from its outlet or outlets for effecting draft thereto. A preferred embodiment has two such heating conduits at right angles to each other and with an opening therebetween to further increase draft through the conduits. In the case of forced convection, the conduits need only open from one of the sides.

Abstract: A downdraft woodburning stove in which there is improved combustion, heat transfer and combustion regulation comprising novel air inlet circulation, grate construction and automatic control of (1) temperature of exhaust gases and (2) of combustion air, and (3) the supplies of both primary and secondary air to a plurality of combustion areas.

Abstract: Fire preventing shielding and air circulation apparatus for use with a box-type stove includes means for forming a chamber bounded at its top by the bottom of the firebox of the stove using a flat panel and upwardly extending apertured sides. A preferred embodiment also includes a stack formed on and bounded by the rear side of the stove and connected to communicate with the chamber.

Abstract: A stove having an external casing provided with an opening and a cylindrical fire chamber disposed within the casing and provided with a hole arranged adjacent to and in communication with the opening of the casing. Arranged extending transversely across the cylindrical fire chamber is a grate, while a door assembly is disposed removably covering the opening provided in the external casing. Included in the door assembly is a hinged cover provided with a vent for controlling draft in the fire chamber, and with a lock which releasably secures the cover to a cowl of the door assembly on which the cover is hingedly mounted.

Abstract: A wood burning stove is formed with double front and rear side walls of heat conductive metal interconnected 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 grate made up of spaced bricks supported by metal holders secured in heat conducting relation to said inner side walls. The rear side air passageway is divided into central and outer vertical sections the central one of which is closed at the bottom end and communicates with the atmosphere through an opening in the outer wall intermediate its vertical ends and with the stove interior above the firebox and below the grate through openings in the inner wall intermediate its vertical ends and adjacent its bottom end, respectively.

Abstract: Disclosed is a means for heating a space with hot air comprising essentially first and second enclosures, the second enclosure being completely surrounded by and spaced apart from the first enclosure to form an air chamber for the circulation and heating of air. Energy for heating the air is supplied by burning fuel (wood, coal, etc.) disposed on a plurality of spaced apart, grate forming, tubelike members lying in a common plane positioned inside of the second enclosure. A terminal portion of one end of the tubes bridge across the air chamber and the tubes terminal edges are exposed to the space sought to be heated; terminal edges of the other end of the tubes are exposed to and communicate with the air chamber.

Abstract: A wood burning stove for providing heated air to a room or similar area includes a fire chamber, a hearth in the forward portion of the fire chamber, draft inlet means at the front of the fire chamber and a flue at the rear of the fire chamber. Between the hearth and the flue is an enclosed air chamber having front and rear walls; the air chamber communicates at its bottom with the ambient air and at its top with one or more air pipes which extend to the front of the stove and there open to the ambient air. A baffle plate is positioned between and spaced from the air chamber and the flue. Ambient air is heated by passing it through the air chamber and air pipes after they have been heated by hot gases rising from a fire burning on the hearth; the hot gases contact the air pipes and the front wall of the air chamber and, because their normal path of travel to the flue is altered by the baffle plate, contact the rear wall of the air chamber as well.

Abstract: A stove having a combustion chamber surrounded by four sides and a top and having a warm air conduit extending between opposite sides and opening outwardly of at least one of the sides. Where the stove is to utilize natural convection, the conduits open outwardly of both the sides of the enclosure. An opening is provided in the top or bottom of the warm air conduit remote from its outlet or outlets for effecting draft thereto. A preferred embodiment has two such heating conduits at right angles to each other and with an opening therebetween to further increase draft through the conduits. In the case of forced convection, the conduits need only open from one of the sides.