Abstract: Strategies for providing aesthetically acceptable ventilation for appliances requiring ventilation are described. In one or more implementations, a notch is cut along the upper edge of a cabinet toe kick to allow ambient air to enter and exit an air cavity disposed behind the toe kick. A fence or trim piece is then installed in front of the notch to hide the notch from view and to create a labyrinth vent allowing ambient air to enter and exit the air cavity. This ambient air flow is required for proper operation of appliances requiring ventilation.

Abstract: A cooking appliance includes an oven cavity and a door for selectively opening and closing the oven cavity. The door includes an interior space and a latch opening defining a hole into the interior space. A spill receptacle is provided within the door and is aligned with the latch opening. The receptacle defines a compartment that is isolated from the interior space of the door and oriented to capture foreign items that penetrate the latch opening. In one example, a door latch is provided latch for locking the door in a closed position. The latch includes a hook member receivable through the latch opening when the door is in the closed position.

Abstract: An apparatus for cooking or smoking and a fuel combustor therefor. In the cooking or smoking apparatus and method, combustion products produced by the combustor, by a gas burner, or by other means are preferably delivered upwardly through an upwardly extending inner flow gap which at least partially surrounds a cooking or smoking chamber. The combustion products are preferably then delivered downwardly through the cooking or smoking chamber and then upwardly through an upwardly extending outer flow gap which is outside of the inner flow gap and which also at least partially surrounds the cooking or smoking chamber.

Abstract: A door with a gas burner on an inner surface and a system for carrying a combustible gas to the burner on the outer surface thereof. The door comprises a pair of metal sheets rigidly connected to one another at the edges thereof, each sheet having input and output openings for the gas mixture that are mutually separated in order to leave an inner space receiving a deflector plate serving as a thermal shield to be swept over on either side by the flow of the gas mixture supplying the burner. This arrangement reduces heat loss through the door; thus, keeping the outer surface cold, avoiding the risk of burns, and preheating the gas mixture. The invention can be used in heating appliances.

Abstract: An oven that effectively cools a door by adjusting a position of a cooling guide includes a casing having at least one inhalation hole and at least one ejection hole; a cooking chamber which has an opening and is placed inside the casing; a door that is rotatably coupled to one portion of the casing so as to open/close the opening; a cooling fan that discharges air introduced into the inhalation hole to the ejection hole placed at a front portion of the casing; and an air guide that is installed adjacent to the ejection hole so as to change a direction of air driven by the cooling fan. The cooling guide is installed not to disturb the flow of air that passes through the door so that the door using minimum sheets of glass can be provided.

Abstract: The present invention relates to a method for aerating and deaerating an oven (1), which has at least two oven muffles (2, 3) disposed one above the other, the feed apertures (5, 6) of which are or can be closed in each case by a door (7, 8), comprising the following procedural steps: cooling air (L) is drawn off from an outside area surrounding the oven (1), and the drawn-off air (L) is blown at least partially into interior spaces (9, 10) of the doors (7, 8) and then blown out into the outside area after flowing through at least a part of the interior spaces (9, 10), wherein the drawn-off air (L) is blown into the upper door (7) in an upper section of that door (7) and flows substantially downward from above through the interior space (9) of the door (7), wherein the drawn-off air (L) is blown into the interior space (10) of the lower door (8) at a bottom end section thereof and flows substantially upward through the interior space (10) of the door (8), and that the air blown into the interior spaces (9, 10

Abstract: An exhaust baffle is provided for a domestic appliance. The exhaust baffle includes a support bracket having two tabs, the tabs being configured to slide into engagement with slots formed in the base of the domestic appliance, two support elements, each of the support elements extending from one of the tabs at an angle and having a bearing surface, and a bridging element that extends from the two support elements at an angle, the bridging element connecting the two support elements; a baffle top having a hot gas directing portion that rests on the bearing surfaces of the support bracket and an opening that receives the bridging element; and a baffle bottom having a substantially flat member, the baffle bottom holding the support bracket in the slots when the baffle bottom is in an operating position.

Abstract: A built-in oven comprises a door and a ventilation system. The door structure comprises two vertical frame elements and an upper hollow frame element mounted on the vertical elements and on upper edges of two or more glass plates and having a front aperture adapted to be used as an handle of the door flush with the front surface thereof, the upper hollow frame element being used as part of the ventilation system of the oven.

Abstract: An operational module for a domestic appliance door including at least one operational control received therein, wherein the operational module is configured for at least partial insertion into a recess of the domestic appliance door from the exterior. An operational module for a domestic appliance door, including at least two operational controls received therein, wherein the operational module is configured for at least partial insertion into a recess of the domestic appliance door. A domestic appliance door, especially an oven door, comprises at least one recess for at least partially accommodating at least one of the operational modules.

Abstract: A cooking device includes a housing having an opening, an airflow device that draws air into the housing through the opening, a filter that is removably connected to the housing to cover the opening, and a controller that controls an amount of the air drawn into the housing based upon a presence of the filter covering the opening or an absence of the filter covering the opening.

Abstract: An appliance includes a housing having an airflow channel communicating with outside of the appliance; a first chamber in the housing and having a first opening; a first door for selectively closing the first opening, the first door having a first airway communicating with the outside of the appliance; a second chamber in the housing and having a second opening; a second door for selectively closing the second opening, the second door having a second airway communicating with the outside of the appliance; and a fan in the airflow channel. The airflow channel includes a central segment disposed between the first and second chambers and communicating with the first and second airways. When activated, the fan causes ambient air to pass through the first and second airways before entering the central segment so that the first and second doors are cooled off by the ambient air.

Abstract: The invention relates to a door provided with a gas burner on the inner surface thereof and with a system for carrying a combustible gas to the burner on the outer surface thereof, and which can be inserted and attached into a frame of a wall of the device (AC); the door comprises a pair of metal sheets rigidly connected to one another at the edges thereof, with input openings and output openings for the gas mixture, respectively, and which are mutually separated, in order to leave an inner space receiving a deflector plate serving as a thermal shield to be swept over on either side by the flow of the gas mixture supplying the burner. Said arrangement reduces heat loss through the door, making it possible to keep the outer surface cold, thus also avoiding the risk of burns, while at the same time preheating the gas mixture. The invention can be used in heating appliances.

Abstract: A built-in oven has a door, a control panel positioned above the door and a cooling system including a fan-motor assembly for drawing cooling air around the outside surface of the oven and an exhaust duct for discharging air to the ambient. The cooling system comprises a cooling air supply duct above the top side of the oven and with an intake opening below the control panel, and an exhaust duct positioned above the supply duct so that its exhaust opening is placed above the control panel, the fan-motor assembly being mounted between the supply duct and the exhaust duct.

Abstract: A cooking apparatus including a cooking chamber having an opening, a door configured to open and close the opening of the cooking chamber, the door including a channel and an inlet to allow communication between the cooking chamber and the channel, and an opening/closing unit to open and close the inlet in the door. A door including a first surface, a second surface spaced from the first surface to define a channel between the first surface and the second surface, an inlet formed in the second surface, the inlet being in flow communication with the channel, an outlet formed in one of the first surface and the second surface, the outlet being in flow communication with the channel, and an opening/closing unit to open and close the inlet in the second surface is also provided.

Abstract: An appliance is disclosed. The appliance includes a main body defining a cavity and an air channel which is in flow communication with an outside of the appliance; an access door supported by the main body for selectively closing the cavity, the access door having an airway in flow communication with the outside of the appliance and the air channel; a fan disposed in the air channel; and an Human Machine Interface disposed on or in the access door. When activated, the fan causes ambient air from the outside of the appliance to pass through the airway before entering the air channel so that the access door is cooled off by the ambient air.

Abstract: A kitchen range subframe includes air channels for passively directing air to and/or from an element enclosure within the kitchen range, and a range component shelf that is configured to mount one or more range components to the kitchen range subframe. The kitchen range subframe provides improved ventilation for the kitchen range, and mounting locations for range components such as gas lines and kitchen range controls.

Abstract: A cooking appliance is provided that has a structure which efficiently cools an electric element chamber. The cooking appliance includes an appliance body that has a cooking chamber to cook food, a door that opens and closes the cooking chamber, and cooling flow passages that absorb heat transferred from the cooking chamber. Additionally, an intake air duct may be provided proximate a top side of the cooking chamber to communicate with the cooling flow passages. Further, an exhaust duct may be provided proximate the intake air duct to communicate with the intake air duct. Further, a fan-motor assembly may be provided in a space formed by the intake air duct and the exhaust duct such that the fan-motor assembly forms a portion of a connecting passage that connects the intake air duct and the exhaust duct.

Abstract: A door assembly for a cooking apparatus is provided that prevents heat generated in a cooking chamber from being released to the outside while also being as thin as possible. The door assembly may include a glass support that supports a first glass panel on a front side, and a second glass panel on a rear side. The second glass panel may be supported by a seating protrusion and catching protrusions formed on the rear side of the glass support. A door frame may be coupled to the rear side of the glass support, with a third glass panel coupled to either a front or rear side thereof. A cover frame may be coupled to the rear side of the glass support to enclose the first, second and third glass panels and the door frame.

Abstract: A double oven combination is configured to be “built-in” an area of a household—in other words, permanently secured relative to the household area and integrated with other elements of the household area to provide a consistent decorative appearance. The double oven combination comprises an upper oven and a lower oven each of which may be a convection or non-convection oven that cooks and heats food and other substances via radiant and convective heating, and a control panel. The double oven combination has an integrated cooling air and exhaust air flow arrangement for efficiently guiding exhaust air away from the upper oven and the lower oven while at the same time effectively flowing cooling air relative to the double oven combination to promote desired cooling of the double oven combination.

Abstract: An oven door has an outer door panel, an inner door panel, and a viewing panel being disposed intermediate the outer and inner door panels. The oven door is provided with an air deflection assembly disposed intermediate the outer door panel and the viewing panel. The air deflection assembly deflects a first portion of an entry air stream of air from outside the oven into a first branch path extending vertically along a left hand side and deflects a second portion of the entry air stream into a second branch path extending vertically along a right hand side.

Abstract: A double oven combination is configured to be “built-in” an area of a household—in other words, permanently secured relative to the household area and integrated with other elements of the household area to provide a consistent decorative appearance. The double oven combination comprises an upper oven and a lower oven each of which may be a convection or non-convection oven that cooks and heats food and other substances via radiant and convective heating, and a control panel. The double oven combination has an integrated cooling air and exhaust air flow arrangement for efficiently guiding exhaust air away from the upper oven and the lower oven while at the same time effectively flowing cooling air relative to the double oven combination to promote desired cooling of the double oven combination.

Abstract: A door assembly for a home appliance includes a door that opens and closes a heating chamber. The door may include a first plate and a second plate, the first and second plates forming a first air gap in the door for insulating heat in the heating chamber. Additionally, a valve may be provided in the door, the valve may selectively allow air outside the first air gap to communicate with the first air gap.

Abstract: A door assembly for a cooking appliance including a cabinet, a lower oven cavity and an upper oven cavity defined within the cabinet is provided. The door assembly includes a lower oven door movably coupled to the cabinet and configured to cover the lower oven cavity. The lower oven door defines a lower oven door air inlet and a lower oven door air outlet. A lower oven door air passage is defined within the lower oven door and provides flow communication between the lower oven door air inlet and the lower oven door air outlet. An upper oven door is movably coupled to the cabinet and configured to cover the upper oven cavity. The upper oven door defines an upper oven door air inlet and an upper oven door air outlet. An upper oven door air passage is defined within the upper oven door and provides flow communication between the upper oven door air inlet and the upper oven door air outlet.

Abstract: A combination of a wood stove and radon collecting system. A radon collection tube located in the basement of a building is connected via conduit leading into the combustion chamber of the stove. Burning wood within the combustion chamber is operable to normally cause radon within the building to flow into the radon collection tube, through the combustion chamber and then out through an exhaust tube. In the absence of burning wood, a lighted candle is placed in the combustion chamber tube to cause the radon within the radon collection tube to flow into the combustion chamber and then out through the exhaust tube.

Abstract: An electric oven includes a housing having a cooking chamber for cooking food and a component chamber containing components for operating the electric oven. A door is provided on a front of the housing for selectively opening and closing the cooking chamber. A suction duct introduces external air from outside of the housing into the component chamber, and an exhaust duct with a sloped portion discharges air from the component chamber to outside of the housing.

Abstract: A cooling apparatus of a cooking appliance including a cabinet having a cooking chamber located therein and an electric component chamber located outside the cooking chamber; a door installed on the cabinet for opening and closing the cooking chamber, and having a suction channel and a discharge channel communicating with the electric component chamber; and an air blower installed in the electric component chamber for sucking air to the inside of the electric component chamber through the suction channel and the discharge channel of the door and discharging the air, so that the external air having a low temperature is directly sucked through the door, cools the electric component chamber, and is then discharged to the outside, thereby increasing cooling efficiency of the door.

Abstract: A heating appliance includes an outer enclosure including a transparent front panel, a combustion chamber enclosure, and a variable speed blower. The combustion chamber enclosure is positioned within the outer enclosure and defines a combustion chamber wherein radiant heat is generated. The combustion chamber enclosure also includes a transparent front panel. The blower is configured to generate an adjustable airflow between the outer enclosure front panel and the combustion chamber enclosure front panel and to exhaust the airflow to a remote location. The airflow absorbs at least some of the radiant heat and varying a speed of the blower controls an amount of radiant heat transferred from the combustion chamber to a living space in which the heating appliance is exposed.

Abstract: A door assembly for a cooking appliance including a cabinet, a lower oven cavity and an upper oven cavity defined within the cabinet is provided. The door assembly includes a lower oven door movably coupled to the cabinet and configured to cover the lower oven cavity. The lower oven door defines a lower oven door air inlet and a lower oven door air outlet. A lower oven door air passage is defined within the lower oven door and provides flow communication between the lower oven door air inlet and the lower oven door air outlet. An upper oven door is movably coupled to the cabinet and configured to cover the upper oven cavity. The upper oven door defines an upper oven door air inlet and an upper oven door air outlet. An upper oven door air passage is defined within the upper oven door and provides flow communication between the upper oven door air inlet and the upper oven door air outlet.

Abstract: An air curtain door system for inhibiting heat and exhaust exiting from an access opening of an oven includes a door panel which has an access opening and a mantle attached to a bottom end of the access opening, the mantle having an air outlet slot extending horizontally along the access opening; an air inlet opening near a lower end of the door panel; a hollow chamber within the door panel disposed from the mantle to near the lower end of the door panel; an air supply means for providing air supply to the hollow chamber through the air inlet opening; and an exhaust venting assembly adjacent to an upper end of the door panel, for pulling air exiting from the air outlet slot into the exhaust venting assembly, thereby forming an air curtain covering the access opening at the interior side of the door panel.

Abstract: A combination of a wood stove and radon collection system. A radon collection tube location in the basement of a building is connected via conduits leading into the combustion chamber of a wood stove. Means secure the radon collection outlet to the stove between the stove door and the stove main body. Metal strips extend across gaps formed between the stove door and stove main body when the outlet is in the installed position.

Abstract: A cooling apparatus of a cooking appliance including a cabinet having a cooking chamber located therein and an electric component chamber located outside the cooking chamber; a door installed on the cabinet for opening and closing the cooking chamber, and having channels so as to cause external air to flow into the electric component chamber and a part of the air to flow into the electric component chamber via side surfaces of the cooking chamber; and an air blower installed in the electric component chamber for forcibly sucking in the external air and discharging air having cooled the door and the electric component chamber, thereby improving cooling efficiency of the door and the inside of the electric component chamber.

Abstract: A system for reducing discharges from an oven prior to opening an oven door. In particular, the system includes a housing forming a cooking compartment arranged within the oven. The system also includes a purge passage extending through the housing into the cooking compartment and a cover arranged over a portion of the purge passage to removeably block the purge passage. An expelling port is included that extends from the cooking compartment through the housing. A controller is configured to remove the cover from blocking the purge passage to inject air into the cooking compartment through the purge passage and displace substances within the cooking compartment through the expelling port.

Abstract: An electric oven is provided with an improved structure for uniform transmission of heat from a heater to food in a cooking cavity. The electric oven includes an outer case, an inner case, a heater cover, at least one heater, a fan housing, and a fan. The outer case has a door mounted in a front part thereof, the inner case is in the outer case, and the inner case has a plurality of holes in an upper part thereof. The heater cover is located over the holes, and the heater is under the heater cover. The fan housing is attached to an inside wall of the inner case, and has a plurality of apertures. The fan is between the fan housing and an inside wall of the inner case, for drawing air from the cooking cavity and blowing a portion, or all of the air toward the heater.

Abstract: An oven door includes a transparent zone defined by a window pack and an additional piece of glass arranged in front of the window pack. Specifically, the additional piece of glass is mounted at an angle to the panes of the window pack, with the angled glass diverging farther from the window pack at an upper section than at a lower section. Through mounting the angled piece of glass in the door as set forth above, a chimney effect is established for heat conducted through the door such that an attainable temperature at a front surface of the door is significantly reduced.

Abstract: A cooking apparatus for controlling the opening of a cover over a barbecue grill includes a motor for opening and closing the cover over the barbecue grill, with the motor connected to the cover by a coupling rod. The cooking apparatus includes, in one embodiment, a counterweight attached at the rear of the barbecue cover. The cooking apparatus also comes with a remote control for transmitting control signals to the motor. The remote control transmits start and stop signals to the motor, or alternatively, the motor operates only during the transmission of control signals to the motor. The remote control may also transmit signals to control flow of a combustible gas. The barbecue cover opener is removable from the barbecue grill. Control of the motor allows movement of the cover to stop at any point within the full range of the cover being opened or closed.

Abstract: A cooking oven includes a heatable oven chamber (6) that can be loaded with product from the outside area (A) through a loading port (8). An oven door (10) serves to close off the loading port (8) of the oven chamber (6) from the outside area (A). An inner pane (50) faces the oven chamber (6), an outer pane (48) faces the outside area (A), and one or several intermediate panes (52) are positioned between the inner pane (50) and the outer pane (48). An outer cavity (54) is between the outer pane (48) and the neighboring intermediate pane (52) and an inner cavity space (56) is between the inner pane (50) and the neighboring intermediate pane (52). A cooling system moves cooling air (K1) through the outer cavity (54) while thermally insulating air (I) can be held stationary in the inner cavity (56).

Abstract: A cooking appliance includes a cooking chamber that can be closed by a door having a multi-pane structure, including at least one inner pane and one front pane. The invention configures the cooking appliance such that the surface temperature on the outer side of the front pane is as low as possible. To this end, the inner pane is embodied in a tray-like manner and is fixed to the front pane by holding elements that are disposed on the inner side of the front pane inside the circumferential edge of the inner pane.

Abstract: A heat transfer controller is configured to control the heat distribution and transfer of a heating system. An exemplary heating system comprises an air intake, an exhaust mechanism, and a heat transfer controller. The heat transfer controller is configured to control the distribution and transfer of heat exhausted from the exhaust mechanism to the heating area, and can comprise a heat deflector having a width, length and height that can be suitably configured to provide variable heat transfer control characteristics. In addition, the heat transfer controller can comprise an arch-like configuration. For example, the width of the heat transfer controller can be configured to direct and/or transfer heat from an area most likely to have heat restricted or increased. In addition, the height of the heat transfer controller can be configured to generate a convection effect to pull heat outwards from the area with the greatest heat restrictions.

Abstract: A fireplace including a combustion chamber enclosure with an opening and an inner pane positioned to at least partially cover the opening of the combustion chamber. An outer pane is spaced apart from the inner pane, the outer pane and the inner pane creating a space through which air moves, the air cooling the outer pane. A blower may be provided to move the air through the space. The outer pane may be angled with respect to the inner pane to enhance air movement.

Abstract: A combustion system for burning firewood including a combustion chamber defined by front, rear and side walls, a ceiling and a bottom. An access door is provided for addition of fuel into the combustion chamber. A substantial amount of combustion air enters the combustion chamber near the top of the fueling doors via apertures and is directed down the face of the fueling doors providing cooling. A geometry of the air metering orifice is either fixed or of limited adjustability such that the minimum flow of combustion air required for flaming combustion of a full load of fuel is maintained at all times. The combustion air flow cannot be reduced beyond a certain point and thus smoldering and very low air/fuel ratios are avoided.

Abstract: A combustion system for burning firewood including a combustion chamber defined by front, rear and side walls, a ceiling and a bottom. An access door is provided for addition of fuel into the combustion chamber. A substantial amount of combustion air enters the combustion chamber near the top of the fueling doors via apertures and is directed down the face of the fueling doors providing cooling. A geometry of the air metering orifice is either fixed or of limited adjustability such that the minimum flow of combustion air required for flaming combustion of a full load of fuel is maintained at all times. The combustion air flow cannot be reduced beyond a certain point and thus smoldering and very low air/fuel ratios are avoided.

Abstract: An oven having a ventilation system capable of providing reduced temperature, low moisture exhaust air is provided. The oven has an oven cavity defined by a partition having a through hole and enclosed by an oven door having an air inlet to accept incoming air and a separator located within the door to divide the incoming air into at least a first path and a second path. The oven has an air duct surrounding the partition having at least one inlet at the front of the oven below the door, at least one inlet at the back of the oven and an air outlet at the front of the oven above the door. Also, the oven has a ventilation system capable of providing reduced temperature exhaust air out the air outlet located at the front of the oven.

Abstract: A heating appliance has a firebox and an ash chamber. A primary preheating chamber is located beneath the ash chamber. The preheating chamber is U-shaped in cross section and raised portions or arms extend upwardly and define opposite sides of the ash chamber. The upper flat surfaces of the arms serve as mounting blocks to support a grate above the ash chamber.

Abstract: The invention is directed to a balanced flue or direct vented, solid fuel burning fireplace which may be installed in a building and is operable at energy input levels greater than 75,000 BTU/hour. An enclosure including a top wall, bottom wall and four side walls defines a combustion chamber. At least one of the side walls includes an operable, sealed, transparent access door. A flue is connected to the enclosure and disposed in fluid communication with the combustion chamber and an outside ambient environment external to the building. A combustion air duct is connected to the enclosure and disposed in fluid communication with the combustion chamber and the outside ambient environment external to the building, whereby substantially all of the combustion air supplied to the combustion chamber flows through the combustion air duct when the access door is in a closed position.

Abstract: A fireplace assembly of the type used as a room air heater comprises a second pane of glass in front of and spaced from the glass pane forming the front of the combustion chamber. The two panes form an air passageway for delivering intake air from an upper vent to the bottom of the combustion chamber. The intake air cools the panes of glass such that a relatively inexpensive glass material can be used and such that the front of the fireplace assembly is relatively cool to the touch.

Abstract: A stove comprises a combustion chamber and a window disposed at the front wall of the combustion chamber. The stove further includes a device disposed at the front wall of the combustion chamber for directing air into the combustion chamber across the inner side of the window and in a downward direction. The device can form, across the inner side of the window, a screen of air which has a width approximately equal to the width of the window. The device includes a longitudinal chamber and a longitudinal slot in flow communication with the longitudinal chamber. Disposed within the slot are: a cylindrical register which can be rotated about its longitudinal axis for controlling a flow amount of the screen of air across the window; a profiled piece having air passage openings therein; and a flexible sealing leaf engaging, on one side thereof, the cylindrical register, and on another side thereof, the profiled piece.

Abstract: A stove (1) comprises a fire-box (4), and an ash-chamber (5) separated by a grate (19). Air intake means (21,23) is provided beneath the ash-chamber. Air supply means (30) connected to the air intake means extends vertically past the ash-chamber and the fire-box to an upper region of the fire-box. Air delivery means (27) provides communication between the air supply means and the fire-box. In use fuel burning inside the fire-box causes external air to be drawn into the air intake means, through the air supply means and through the air delivery means to a region above fuel in the fire-box. External air is pre-heated by passing underneath the ash-chamber and past the ash-chamber and the fire-box during its passage into the fire-box. Turbulence caused by an interaction between pre-heated air entering the fire-box and heated air already present causes smoky combusted air (F) to be pushed away from a dose (35) at the front of the fire-box.

Abstract: An outdoor, self-contained wood fueled furnace. The furnace includes a non-warping, laminated sheet metal door; a rear exiting flue with water discharge means; and a baffled, heat exchanger which surrounds the firebox. The door, particularly, includes an external panel which is secured with a single pin to a crossbroken first panel. An insulator is secured between the first panel and a second interior panel, and the first and second panels are riveted to each other.

Abstract: An air guide element is installed between air supply vent and the inside of he door of the heating appliance which consists of an adjustable damper for regulating the supply of secondary combustion air and ballast air in the appliance and in which at least one heat sensitive element is connected between said damper and one of the components of the heating appliance which serves to adjust said damper, which element reacts to the prevailing temperature in the combustion chamber of the appliance.

Abstract: A high efficiency clean burning fireplace for burning solid fuels at pyrolytic temperatures is provided with refractory walls maintained about 1100.degree. Fahrenheit at different burning rates. A top wall of the combustion chamber includes an exhaust stack and a primary air heat exchanger having an exhaust manifold for discharging primary preheated combustion air down and across the inside surface of glass panels in the doors of the fireplace. A secondary air heat exchanger is mounted below the primary air heat exchanger and separated therefrom by a top refractory panel in the combustion chamber. The secondary air heat exchanger exhaust manifold is in the combustion chamber and discharges secondary combustion air across the top of the combustion chamber and into the primary combustion air creating a high turbulence and complete burning of the secondary production of combustion while heating the refractory walls above a pyrolytic temperature at different burning rates.