Abstract: A heat exchanger comprises a multiplicity of stacked plates having a thickness of less than 0.3 mm, each of which is provided with a male dished member (8) which delimits a fluid distribution zone (6, 7) in the exchanger (1). At least a first plate (3) and a second plate (4) each comprise a peripheral edge (25) which is assembled in a fluid-tight manner in order to form a fluid circulation pipe. The exchanger also comprises at least one insert (5) which is provided with a female dished member (9), and the male dished member (8) of the plates (3, 4) is configured to be introduced into the female dished member (9) of the insert (5) in order to ensure fixing between two adjacent fluid circulation pipes or between a side plate (15, 16) and an adjacent fluid circulation pipe.

Abstract: Heating a room in a structure with a fireplace includes feeding combustible gas to a burner of a combustion assembly of the fireplace to create heat and flames with hot exhaust air passing out of a combustion chamber of the fireplace through an exhaust duct and into an exhaust air conduit of a secondary heat exchanger and out of the structure.

Abstract: One aspect provides a heating device comprising a firebox having a hearth therein and first and second heat exchange chambers, and a heat exchanging plate having a first surface and a second opposing surface. The heat exchanging plate is suspended above the hearth, such that the first surface is located between the hearth and the second surface. The heat exchanging plate has lower protrusions extending from the first surface and into the first heat exchange chamber, and upper protrusions extending from the second surface and into the second heat exchange chamber. A method of manufacturing a heating device is also disclosed.

Abstract: An unvented gas fireplace in which air flow through a closed combustion chamber is controlled by means of a restriction in the air flow path through an outer plenum chamber surrounding the combustion chamber. The restriction in the air flow path through the plenum causes a pressure differential between the plenum and combustion chamber, forcing air from the plenum into the combustion chamber, where it is combusted and mixed with the cool air that has passed the restriction in the plenum, before the air mixture is exhausted into the surrounding room, thereby heating the room.

Abstract: A fireplace apparatus for a building includes a firebox, and a plenum arranged with an exterior surface of the firebox. A blower is arranged with the plenum to force air through the plenum and a plenum exhaust vent is configured to release the forced air from the plenum. A method of pre-heating air for a building fireplace includes selecting air admitted from inside the building through an interior inlet port into a manifold and through a plenum until the firebox reaches a selected temperature, and selecting air admitted from outside the building through an exterior inlet port into the manifold and through the plenum when the firebox reaches or exceeds the selected temperature.

Abstract: Heating a room in a structure with a fireplace includes feeding combustible gas to a burner of a combustion assembly of the fireplace to create heat and flames with hot exhaust air passing out of a combustion chamber of the fireplace through an exhaust duct and into an exhaust air conduit of a secondary heat exchanger and out of the structure.

Abstract: A fireplace including a body, a heating unit within the body, a duct within the body and in communication with the heating unit, an opening defined by a terminal end of the duct, an insert attached to the terminal end of the duct and arranged to dispel a heated air, and wherein the insert remains at a lower temperature than the duct during a heating operation.

Abstract: The invention provides an insert assembly to convert an existing fireplace hearth into a gas burning fireplace and a method for installing the insert assembly while conveying the appearance of a wood burning fireplace. The insert assembly comprises legs removably attachable to the base of the firebox for allowing the insert to be installed higher into the hearth. The inner walls of the firebox are colored so as to camouflage the structure of the assembly in the hearth and a decorative fender mimics a wood burning grill. Where the insert includes a heat exchanger, a guide plate is provided at the top of the insert to ensure that air exiting the heat exchange outlet at the top of the insert is directed into the room.

Abstract: An improved gas-fired burner for a fireplace. The gas-fired burner includes a substantially sealed enclosure. This enclosure, or “heat tank,” may be of any desired shape, but is preferably of a rectangular, box-like shape. The enclosure includes an inlet port for the ingestion of relatively cold air into the enclosure, and two exit ports, for the exhaust of relatively warm air. The enclosure has a front and a back end, and both the inlet and exit ports may be secured to the back end of the enclosure.

Abstract: A fireplace including a body, a heating unit within the body, a duct within the body and in communication with the heating unit, an opening defined by a terminal end of the duct, an insert attached to the terminal end of the duct and arranged to dispel a heated air, and wherein the insert remains at a lower temperature than the duct during a heating operation.

Abstract: An improved gas-fired burner for a fireplace. The gas-fired burner includes a substantially sealed enclosure. This enclosure, or “heat tank,” may be of any desired shape, but is preferably of a rectangular, box-like shape. The enclosure includes an inlet port for the ingestion of relatively cold air into the enclosure, and two exit ports, for the exhaust of relatively warm air. The enclosure has a front and a back end, and both the inlet and exit ports may be secured to the back end of the enclosure.

Abstract: A heat recovery apparatus for an indoor fireplace includes a plenum chamber of low profile box-like construction having a front extremity with a portion that permits forced entry of air and a horizontally spaced portion that permits emergence of heated air. A divider wall centered within the chamber between the entry and emergence portions produces a passageway that controls the flow of air within the chamber.

Abstract: In an in-wall heater, in which control equipment 11, 12 is disposed in a side space 10 on one lateral side of a combustion housing 2 within an outer case 1 and an exhaust duct 15 is disposed in a side space 13 on the other lateral side of the combustion housing 2, the cooling performance of each of the side spaces is increased and noise due to a sucked-in sound of room air can be reduced. In a side plate portion of the outer case 1 on both lateral sides, an air intake opening 7, which is vertically long, is provided in a position in a front side portion exposed to a front of a room wall. Each side space 10, 13 within the outer case 1 is formed in a ventilation flue on the suction side where the room air from each of the air intake openings 7 is conducted into the warm air fan 9.

Abstract: A front face attachment for a fireplace allows a single fireplace construction to be converted from a first arrangement having front facing top outlet and bottom inlet with covering louver panels for air flow around the combustion chamber to a second arrangement in which there are no front facing outlets and the top and bottom outlets are behind front cover flanges for receiving cladding materials.

Abstract: An apparatus enhances the efficiency of a combustion heating device such as a fireplace by incorporating an ionic gas propulsion mechanism (e.g., a corona discharge device) to transport ambient air through a heat exchanger. A heat exchanger is configured to warm the ambient air using both heat energy produced by the combustion process and/or by byproducts of the combustion, e.g., exhaust gases. Air scrubber functions collect particulates present in the air including combustion byproducts such as ash and soot. An audio modulator may be used to vary the high voltage applied to electrodes of the corona discharge electrodes to vary air velocity in response to an audio or similar control signal to induce a vibratory motion to the air, i.e., sound, in forms such as music or simulated natural noise, and/or to cancel or attenuate undesirable sounds and noises, such as chimney sounds.

Abstract: A heat exchanger system and method for transferring heat from exhaust air from a fireplace to air to be delivered to a living space is described. Heated exhaust air is passed through a heat exchanger before exhaustion from the structure. The heat exchanger couples the exhaust duct and the intake duct and transfers otherwise unused heat from the waste products to the outside air to increase the overall efficiency of the heated product source.

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: An improvement in the art relates to an insert fitted into a standard residential fireplace opening for burning fossel fuels such as wood or coal.

Abstract: A method of cooking food with steam in an automatic household oven comprises receiving a user inputted cooking temperature, receiving a user inputted steam level, and implementing a preprogrammed steam cooking cycle based on the user inputted cooking temperature and the user inputted steam level.

Abstract: A wood burner includes a wrapper. A firebox is positioned in the wrapper that defines a combustion chamber. An air inlet is placed in communication with an external air supply. The air inlet includes a conduit to conduct the external air to the combustion chamber and a second conduit. A manifold is positioned above the firebox. The manifold is in communication with the second conduit, and includes one or more manifold chambers for permitting the external air received thereby to become heated. A plurality of air tubes connect to the manifold to receive the heated external air from the manifold, each plurality of air tubes including a plurality of apertures to direct the heated external air into the combustion chamber adjacent an upper inner surface of the firebox.

Abstract: A wood burner includes a wrapper. A firebox is positioned in the wrapper that defines a combustion chamber. An air inlet is placed in communication with an external air supply. The air inlet includes a conduit to conduct the external air to the combustion chamber and a second conduit. A manifold is positioned above the firebox. The manifold is in communication with the second conduit, and includes one or more manifold chambers for permitting the external air received thereby to become heated. A plurality of air tubes connect to the manifold to receive the heated external air from the manifold, each plurality of air tubes including a plurality of apertures to direct the heated external air into the combustion chamber adjacent an upper inner surface of the firebox.

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 pellet furnace heating apparatus for burning a solid fuel, which pellet furnace heating apparatus in one embodiment includes an enclosure which houses a furnace. A furnace air blower is provided in air communication with the furnace for blowing the burning fuel and increasing heat in the furnace. A hopper is provided for containing the solid fuel, and a fuel delivery mechanism connects the hopper and the furnace for delivering the solid fuel to the furnace. In another embodiment, the pellet furnace heating apparatus includes a burner having a pilot housing and a combustion housing. A fuel delivery mechanism connects a hopper containing the solid fuel with the combustion housing of the burner for delivering the solid fuel to the burner. A furnace air blower is provided in air communication with the pilot housing of the burner for blowing the burning fuel and increasing the heat in the burner.

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: This invention relates to heating apparatus and particularly compact heating apparatus fuelled by a flammable fluid such as gas in which a visible flame is provided. The appearance of the visible flame and the fireplace setting within the heating apparatus is enhanced by the provisions of a reflective means positioned behind the fuel assembly to reflect an image of the assembly and/or the flame towards a viewing port in the front of the heater. Additionally or alternatively, the heater apparatus provides an exhausting of the emissions of the primary combustion directly into the room in which the heater is housed to return much of the otherwise exhausted heat into the room. The exhaust is put through a secondary combustion chamber including or comprising a catalytic converter before being exhausted into the room.

Abstract: A fireplace adapted to heat multiple heating zones of a building, controlled by a control circuit which adjusts the heat input to the fireplace, airflow through the fireplace and ducting of the airflow to the various zones individually in response to a call for heat by thermostats in the zones. The fireplace may also be adapted to provide cooled or circulated air to the zones and may also serve to provide heating to the zones in the event of an electrical power outage. The fireplace is provided with a cabinet having ducts through which air is conveyed by use of a fan to a tube-type heat exchanger, the heat exchanger also in communication with the hot flue gases exiting the combustion chamber of the fireplace. The air heated by the heat exchanger is conveyed to a multitude of fireplace outlets, each of which is provided with a damper which regulates the airflow through the outlet to one of the zones to be heated, depending on whether that zone calls for heat through its thermostat.

Abstract: A novel wood/gas burning fireplace is provided with an open box shaped outer housing. A combustion chamber is mounted inside said housing having a plurality panels that are juxtaposed the panels of the outer housing so as to provide an open wall at the bottom, back and top of the fireplace which serve as a heat exchanger. An insulating panel is mounted in the top wall of the heat exchanger dividing the top wall into two separate passageways. The air passageway below the insulating panel comprises a part of a heat exchanger for heating room air of the space being heated. The air passageway above the insulating panel forms a plenum chamber with apertures in the outer housing panel(s) for conducting room air into the plenum chamber. A stack opening aperture in the top panel of the outer housing conducts cooling air into a coaxial exhaust stack for cooling the top panel as well as the exhaust stack pipe.

Abstract: A gas burning direct vent fireplace having an outer casing within which a firebox is mounted. The sides of the firebox are secured to the sides of the casing so that the bottom of the firebox is spaced above the floor of the casing without the need for supporting legs for the fireplace. An access door having a glass plate is fastened to the firebox at the front and a front panel is removably carried by the casing in front of and spaced from the glass plate access door, the front panel having an opening permitting viewing of the interior of the firebox through the glass plate. The mounting of the front panel permits a variety of selective front panels having varying aesthetics to be used with a fireplace.

Abstract: A fireplace having a low density ceramic fiber duct with a first duct portion which promotes secondary combustion of unburned products of combustion and a second duct portion which removes products of combustion from the front of the combustion chamber. The ceramic fiber duct is positioned within the fireplace at a location along the flow path of the products of combustion that is intermediate the fireplace combustion chamber and flue. The first ceramic fiber duct portion includes a number of horizontally spaced and longitudinally extending circuitous, internal passageways which define the flow path as well as segregate the products of combustion. Due to their ceramic fiber construction, the passageways heat up quickly to promote secondary combustion of combustion products therein soon after fire ignition. In addition, the passageways are structured such that the combustion products must cover an extended exhaust path, which lengthens their stay within the heated passageways and promotes secondary combustion.

Abstract: A fuel-fired fireplace insert has a compact combination heat exchanger/draft hood structure extending interiorly along its top side and opening outwardly through an upwardly extending flue gas outlet and a dilution air inlet disposed on a top front side portion of the insert. During insert operation, hot combustion gas generated within its fire box portion flows upwardly into the interior of the heat exchanger/draft hood structure, is cooled by room air entering the dilution air inlet, and is discharged through the flue gas outlet. At the same time, room air enters the insert through an opening on a lower front side thereof, is heated by being passed externally along the fire box and the combination heat exchanger/draft hood structure, and is then discharged from the insert back into the room through openings adjacent the dilution air opening.

Abstract: A fireplace including a heat exchanger beneath the combustion chamber floor. The front panel or surround of the fireplace housing includes a central opening which accesses the combustion chamber. Room air inlets and outlets, which are ducted to the heat exchanger, are horizontally arranged in a duct manifold that is positioned above the front panel opening. By positioning the room air inlets and outlets within the front panel opening rather than in the surround, the entire surround can be faced with marble, brick or other decorative material without having to provide a break therein for the ingress and egress of room air. A fan within the heat exchanger circulates room air in a flow path from the room being heated into the duct manifold inlets, through a first duct and into the heat exchanger, from the heat exchanger and through a second duct, and out through the duct manifold outlets. The fireplace also includes a raiseable hearth overlaying an opening accessing the heat exchanger fan.

Abstract: A fireplace with a cooling air passageway within the fireplace housing that maintains the forward portion of the housing top wall cool during operation. The fireplace includes a combustion chamber, a flue, and an outer housing that encloses the combustion chamber. Plenums formed between the walls of the outer housing and the combustion chamber walls are used to circulate room air to keep the housing cool. Disposed within a forward portion of the upper plenum above the combustion chamber is a passageway constricting baffle. The baffle constricts the cross-sectional area of the upper plenum through which the cooling air flows and forces the cooling air flow upwardly against the underside of the housing outer top wall, thereby cooling this portion of the housing which typically is difficult to keep cool. The fireplace also includes a baffle which directs cooling air outlet from the upper plenum to a venturi passageway in communication with the flue.

Abstract: A fireplace, comprising an inner jacket and an outer jacket defining an air circulation path therebetween, is provided with a smoke chamber convection wall and a baffle convection wall oriented so as to efficiently transfer heat from the fire box to the air circulation path. A damper plate and a back draft blocking wall are positioned in the fireplace so as to effectively block back drafts in both the open and closed damper positions. The fireplace also includes exterior controls whereby the damper plate and an outside air vent can be controlled in a safe manner. A clean out shaft and a draft control are also provided to facilitate safe operation of the fireplace.

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: 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: The invention describes a heating device (1) for solid fuels (2) with a heating element (3) which comprises a combustion chamber (6) and adjacent thereto a flue gas conduit. Downstream of the combustion chamber (6) a suction device (30) for the flue gases (29) is arranged within the path of the flue gas conduit (39). A heat exchange unit (34, 78, 85) is arranged at least in the region of one of the two side walls (35, 36) and/or the rear wall of the heating element (3), whereby this unit is arranged at a distance from the side wall (35, 36) and/or the rear wall of the heating element (3) facing towards it. An admission opening (49) of the heat exchange unit (34, 78, 85) is connected to the interior (33) of the combustion chamber (6) by a discharge channel (32).

Abstract: A fireplace having a bottom wall, inner top wall, two side walls and rear wall defines a combustion chamber having a front opening. An outer top wall is disposed above the inner top wall. The outer top wall and the inner top wall are disposed in spaced apart relationship relative to each other and define an air flow channel therebetween having an inlet. The outer top wall is an upper exterior surface of the fireplace and includes a first nozzle member. The inner top wall is an upper interior surface of the combustion chamber and includes a second nozzle member. A chimney flue is attached to the outer top wall. The first and second nozzle members are in fluid communication with the chimney flue and define a converging nozzle therebetween inducing a flow of cooling air in the air flow channel.

Abstract: This invention relates to A contra-flow masonry heater comprising: a firebox having a front opening, an air intake communicating with a source of fresh air and an upper flue outlet; at least one vertical contra-flow heat exchange channel communicating between the flue outlet and an exhaust port, the firebox and channel having walls of refractory material for mass absorption of heat energy from a burning fuel and combustion gases contained therein and subsequent radiant release of heat energy to an adjacent space, a down draft hood communicating between the exhaust port and outside air, the down draft hood having a plenum communicating among an exhaust inlet, a chimney and a relief port, the relief port being located below the elevation of the exhaust inlet and communicating with the source of fresh air; and an air tight door secured to the front opening of the firebox.

Abstract: A fireplace has a manifold positioned between a combustion chamber and a flue. The manifold has a pair of inlets to supply dilution air to the flue, one extending from a front face of the fireplace, and the other from a rearward location. A baffle extends across the outlet of the manifold to prevent direct communication between the combustion chamber and flue. The inlet at the front face enables the flow of dilution air to be checked with the fireplace installed without having to accomodate the full flow of dilution air. The baffle prevents downdrafts from adversely affecting the combustion in the combustion chamber.

Abstract: A fireplace comprises a firebox which has a flue and front, bottom, top, rear and side panels. An outer casing is spaced from and surrounds the firebox. A combustion air plenum is positioned at a point above the bottom of the firebox and is connected to a conduit that communicates with a source external to the room in which the fireplace is situated for supplying combustion air to the fireplace. The firebox has a combustion air entry port in at least one of side panels of the firebox near the bottom of the firebox for supplying combustion air to the interior of the firebox. The combustion air port communicates with the combustion air plenum through a first passage. The flue passes upwardly through the firebox and is adapted to be connected to a second conduit that is in communication with a source external to the room which the fireplace is situated for exhausting the combustion gasses from the fireplace.

Abstract: A fireplace insert for a fireplace cavity that includes a venting passage comprising an enclosure dimensioned to be insertable within the fireplace cavity and fill substantially the entire cavity to define a combustion chamber. A passage and an aperture are provided for communicating the combustion chamber with the venting passage. There is a connection system for quickly and efficiently connecting the enclosure to the venting passage while the enclosure is within the fireplace cavity. The ability to connect the insert to the existing venting passage while in place permits the full fireplace cavity to be used. Previous inserts of this type were substantially smaller since there had to be room to manoeuvre and attach the vent by physically reaching into the fireplace cavity.

Abstract: A gas log fireplace includes a firebox which defines a combustion chamber, a gas burner located within the firebox, an artificial log set, a log support member positioned on the gas burner, a heat exchanger connected to an exhaust gas outlet of the firebox and a convection chamber which surrounds the firebox and the heat exchanger for heating of room air. The gas burner is fabricated of a refractory fiber material. A combustible gas and primary air are mixed in a Venturi inlet tube of the gas burner. Highly aerated gas flows through front ports and top ports in the gas burner. Secondary air is directed to the front ports and the top ports to obtain highly efficient combustion and high heat output. The artificial log set, the support member and the gas burner define a partially enclosed cavity which is maintained at a high temperature during operation by reradiation from the artificial logs, the support member and the gas burner.

Abstract: A zero clearance fireplace of the type adapted to be installed against an outside wall of an interior space or room to be heated is provided with six walls which comprise four substantially vertical walls, a top wall and a bottom wall at least two of said vertical walls having airtight glass side walls connected to the frame structure of the fireplace. The bottom wall, the vertical side wall and the top wall are provided with plenum structures which are inner connected to form a heat exchanger. The rear wall is provided with a vertical inner plenum in which outside fresh air is introduced and conducted into a bottom inner plenum below the combustion chamber of the fireplace to provide fresh outside air to the gas burner system in the combustion chamber.

Abstract: A heat exchanger for use in a fireplace assembly having walls surrounding a fire combustion chamber, an air passage provided therein and a flue assembly for exhausting combustion chamber effluent. The heat exchanger includes a housing adapted to be mounted in the fire combustion chamber and communicating with the air passage. The housing has a first housing wall, a second housing wall and intermediate walls connecting the first and second housing walls. The first housing wall has an opening therein to receive combustion chamber effluent. The second housing wall has an opening for emission of combustion chamber effluent which is adapted for communication with the flue of the fireplace assembly for exhaust of the combustion chamber effluent from the fireplace assembly. Intermediate walls connect the first and second housing walls in a spaced relation.

Abstract: Heating apparatus for heating an environment comprises one or more heat exchange conduits (A, B, C, D, E, F, 6, 8) located in the flow path of primary heated fluid (F1-F2), and a device (4) for inducing a flow of air in each conduit, each conduit being adapted to carry air into, through and out of a heat flow path to the environment (2), the arrangement being such that, in use, air within the conduits progresses from a cooler to a hotter part of the heat flow path, and the conduits are spaced closer together toward the downstream direction of the flow path to improve the efficiency of heat exchange between the primary heated fluid and secondary air in the conduits.

Abstract: A heat exchanger is disclosed herein for placement in the firebed of a standard fireplace which includes a heat box having an inlet and an outlet separated by a heat chamber having a series of baffles included for conducting an air flow across the panels of the heat box. The panels of the heat box define the heat chamber and are in close or immediate proximity to the fire in the firebed so that the heat induced into the panels is transferred to the air flow conducted past the panels by the baffles. A blower is coupled to the box inlet by a suitable conduit so that ambient room air is provided to the heat chamber while a discharge conducts the heated air flow back into the room.

Abstract: A zero clearance fireplace of the type adapted to be installed against an outside wall of an interior space or room to be heated is provided with six walls which comprise four substantially vertical walls, a top wall and a bottom wall at least two of said vertical walls having airtight glass side walls connected to the frame structure of the fireplace. The bottom wall, the vertical side wall and the top wall are provided with plenum structures which are inner connected to form a heat exchanger. The rear wall is provided with a vertical inner plenum in which outside fresh air is introduced and conducted into a bottom inner plenum below the combustion chamber of the fireplace to provide fresh outside air to the gas burner system in the combustion chamber.

Abstract: A reduced clearance system, or heat shield, for a coal, gas or wood burning fireplace having a cast iron surround, a hood and a grate, said heat shield including a sheet metal box, preferably a double wall sheet metal box with insulation between the wall members, having a base, three vertical sides, and a stepped top. Each of the sides has secured externally thereto a generally horizontal spacer bar. The front is open and receives the fireplace, the latter being secured to the shield by a clamping bar mounted on the front of the lower top step and side clamps. Each of the top closures has spacer bars attached thereto. The uppermost top portion has an aperture adapted to receive and retain a chimney system. Embodiments of this invention are safety approved.

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: An efficient low carbon monoxide burner system for decorative gas logs is further provided with one or more pipe branches which provide glowing embers in front of and/or on the bottom of decorative gas logs placed over the gas log burner system. The pipe branch which provides the glowing embers is provided with decorative ember flame holes which are arranged directly juxtaposed expanded fire resistant material which is heated so as to form a glow material for producing glowing decorative ember flames in front of or at the bottom of the decorative logs in a manner which produces low carbon monoxide. The pipe branch for providing decorative flames between logs is provided with nozzles for directing the flames away from the logs.