Abstract: Elongated, vertical air chambers having an open upper end and a closed lower end are located within or attached to the walls of a fireplace, where the upper ends open only into the interior of the fireplace. Air heated within the air chambers rises into the fireplace to increase the drafting efficiency, and is replaced in the air chambers by relatively cooler, draft inhibiting air drawn only from the upper interior of the fireplace. In large furnace applications, the air chambers are located in the lower portion of the chimney.

Abstract: A heater for burning combustible pelletized fuel. The pelletized fuel is delivered at a controllable rate to a double-walled burn pot in an enclosed combustion chamber. Combustion air is injected into the combustion chamber at a pressure higher than the ambient air pressure surrounding the heater. Combustion air is injected between the walls of the burn pot through ports in the inner wall into the fuel at or slightly below the top of the fuel level. Additional combustion air is injected approximately horizontally across the top of the burn pot through an injection air manifold. Crossfire injection air is injected approximately vertically about the periphery of the burn pot, confining fumes and exhaust air directly above the burn pot. Heated exhaust gasses rise to the top of the combustion chamber and are drawn from the combustion chamber through a heat exchange unit surrounding the combustion chamber. The exhaust gasses are drawn from the combustion chamber by suction created by and extraction air mechanism.

Abstract: A fireplace and chimney assembly is provided which includes a two wall chimney construction and a termination shield for reducing the amount of cold air which can radiate into a living area. The termination shield encompasses the base of the chimney construction while providing sufficient open area for cooling air to be drawn into the annular space within the two wall chimney construction. A false ceiling is installed above the shield. A firestop is provided therein for receiving the top end of the shield. The assembly prevents cold air from dropping into the chase cavity around the fireplace when the fireplace is not in use.

Abstract: A self-adjusting, telescoping concentric flue assembly provides non-separating, substantial flexibility between the telescoping sections of both the flue and the air supply ducts. The lower flue and air supply ducts may move radially independently of each other sufficiently to permit installation even on a furnace having somewhat non-concentric flue and air inlet connections. Attachment of the lower air supply duct to the furnace insures that the lower flue is likewise attached, yet the lower air supply duct can be raised independently of the lower flue to check the connection of the latter with the furnace flue connection.

Abstract: A combustor including a combustion chamber having two paths for removing combustion exhaust gases, a valve in one path, and means to provide, when the valve is in a closed position, pressure at a downstream side of the valve higher than the pressure inside the combustion chamber to prevent leakage of combustion gases from the combustion chamber through the valve.

Abstract: A power venter for connection to an appliance vent system to provide draft and gas flow and which has components mounted exteriorly of a building wall and components extending through the wall, with the latter components including an inner pipe connectable to a vent pipe of a vent system and an outer pipe surrounding the inner pipe in spaced relation functioning as a heat shield and providing an annular space therebetween. The outside components include a vent hood with a blower housing mounted interiorly thereof and having a blower with an inlet communicating with an outside end of the inner pipe and having a blower outlet to atmosphere. An orifice plate is associated with the blower to separate positive and negative pressure areas and has an orifice opening leading to an eye of the blower, with the blower rotatable about an axis offset from the longitudinal axis of the inner pipe to provide a desired blower diffuser angle.

Abstract: The invention provides a fuel saving device comprising a flue damper of simple mechanical construction mounted on a support member. A hinge connects the flue damper to the support member allowing the closure of the flue damper which is counter balanced when the furnace is shut down. When the furnace is on the gas flow opens the damper.

Abstract: A pulse combustion apparatus in which combustion air is brought into heat exchange relationship with the exhaust system of the apparatus for preheating the combustion air prior to entering the combustion chamber. In a preferred embodiment this is achieved by passing the combustion air through a space between an exhaust cushion chamber of the exhaust system and a housing which encloses the chamber.

Abstract: A valve is provided for installation in the auxillary duct of a furnace stack pipe. The valve prevents flow of air through the damper plate in the auxillary duct when the furnace is switched off. The valve is controlled by a temperature responsive bimetallic strip which is impinged upon by flue gases to move the valve to an open position upon the furnace being ignited and producing combustion gases.

Abstract: A damper for sealing and unsealing a vertical furnace exhaust flue pipe to minimize the escape of heat when the furnace is not operating is disclosed. The damper comprises a cylindrical body adapted to form a section of vertical flue pipe having inner and outer walls. The cylindrical body has a top opening and a bottom opening and at least one transverse hinge rod horizontally transversing the body carried by opposed apertures in opposing wall portions of the body, an annular rim mounted on the inner wall of the body and a pair of oppositely extending gull-wing shaped damper shutters pivotably mounted on said hinge rod. Each of the gull-wing shaped damper shutters have upper and lower surfaces, a lower section and an outer upper section, and in the closed condition the lower sections of the shutters extend upwardly and outwardly at approximately a 45.degree. angle with the outer upper sections of the shutters extending horizontally and slightly spaced from the inner walls of the damper section.

Abstract: There is disclosed an improved flue box assembly for use in conjunction with a heating plant, the flue box having a housing with an interior diametric opening substantially greater than the exhaust gas inlet to and outlet from the interior of the housing, and provided with a damper plate being pivotally mounted within the housing and movable between an open position and a closed position, the damper plate further having a flue opening positioned therein, the improvement consisting of a cap pivotally mounted on the housing adjacent the outlet opening thereof, the cap adapted to pivotally move between a closed position occluding the outlet opening of the housing and an open position leaving the outlet opening unobstructed, and adjustable counterbalancing means associated with the cap for adjusting the relative pressure necessary to move the cap into an open and closed position respectively in relation to the force exerted by flue gases escaping through the outlet opening of the housing, thus providing for impro

Abstract: An auxiliary exhaust system for use with a flue includes a conduit communicating at one end with an opening formed in the flue wall and a blower operable to introduce auxiliary air into the flue through the conduit. The conduit is angled so that the auxiliary air enters the flue with a velocity component extending in the downstream direction of the flow of the products of combustion to aid in venting the combustion unit. A damper located within the conduit operates an on-off switch in a blower control circuit which starts and stops the blower when the damper is opened and closed, respectively. The blower control circuit also includes an automatic combustion control which is responsive to flue temperature to increase the speed of the blower whenever the flue temperature is below a predetermined value and to decrease the blower speed whenever the flue temperature is above a predetermined value. The blower includes an access port which enables a fire extinguishing chemical to be introduced into the flue.

Abstract: A valve for provided for installation in the auxillary duct of a furnace stack pipe. The valve prevents flow of air through the damper plate in the auxillary duct when the furnace is switched off. The valve is controlled by a temperature responsive bimetallic strip which is impinged upon by flue gases to move the valve to an open position upon the furnace being ignited and producing combustion gases.

Abstract: An outdoor furnace including a conditioned air chamber surrounding a fire box and having an air inlet and outlet connected to the space to be heated within the building. The furnace is characterized by a pre-heat chamber for the combustion inlet air as well as deflectors and baffles for maximizing contact of conditioned air flow over the fire box for maximizing the efficiency of the furnace. The furnace may also include an after-burner chamber and a damper for varying the degree of combustion within the after-burner chamber. The furnace also preferably includes an exhaust damper having a thermal control for exhausting excessively heated air from the conditioned chamber.

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 novel chimney sentinel is disclosed which facilitates detection of wood stove flue fires. A sight glass is provided which is kept clear during use through a controlled ventilation of the interior surface of the sight glass. The sight glass is easily removed by hand, even during flue operation, to provide fire extinguisher access to the flue interior.

Abstract: A damper for sealing and unsealing a vertical furnace flue pipe to minimize the escape of heat when the furnace is not operating, the damper comprising a cylindrical body adapted to form a section of vertical flue pipe, the cylindrical body having a top opening and a bottom opening at least one transverse rod horizontally transversing the body and carried by opposed apertures in opposing wall portion of the body, a pair of oppositely extending gull-wing shaped damper shutters pivotally mounted on the rod and in the closed condition extending upwardly and outwardly to the inner surfaces of the cylindrical walls of the damper section, the lower edges of the wing sections engaging an annular rim mounted on the inner walls, the wings opening to a vertical position when the furnace is operating and closing by gravity when the furnace is not operating.

Abstract: Apparatus for viewing the interior of a working chimney so that smoke patterns and the condition of the chimney walls can be continually monitored without the need of discontinuing the operation of a connected stove. The viewing apparatus is rendered airtight so that a fire extinguisher operably connected thereto can fire dry chemicals directly into the chimney in the event a chimney fire is detected.

Abstract: A heater without a chimney is installed inside of a residence. An induced draft system is installed outside of the residence. The heater exhaust gases are connected to the induced draft system with an insulated through the wall exhaust pipe which is cooled by mixing cool outside air with the exhaust gases as they are exhausted to the atmosphere.

Abstract: Improved flue structure for domestic heating equipment such as a gas fired hot water heater. In conventional gas fired water heaters, the heater is directly connected to a chimney or the like by a single flue pipe and this results in a wasteful loss of heat and inefficient use of fuel. The invention provides a multiple, interconnected flue pipe arrangement whereby a substantial portion of the heat produced by the gas burner is trapped in the flue structure keeping it in the system longer and thereby materially cutting down on the heat loss. In one embodiment of the invention, a flue pipe from the heater is connected to the upper end of a second flue pipe that is closed at its top and a third flue pipe, concentrically mounted in the second flue pipe, conducts the heater flue gases to the chimney. Due to the arrangement of these pipes as will be described in detail hereinafter, heat is trapped at the upper end of the second flue pipe resulting in a substantial increase in efficiency.

Abstract: In an exhaust gas duct from a furnace a ventilation opening with a ventilation flap is openable in chronological conjunction with the cut-off of the furnace and it is closable in chronological conjunction with the switching on of the furnace. The ventilation opening is formed by a draft-limiter opening located downstream from the furnace and the ventilation flap is formed by a draft-limiter flap. During a pause in furnace operation, the draft-limiter flap is held in an open position independently of the pressure difference prevailing at the draft-limiter flap. One opening and one flap are eliminated. The draft-limiter flap provides the ventilation function as well as the draft-limiter function. If necessary, it can be installed in a small space together with an exhaust gas flap.

Abstract: An apparatus is disclosed for use in venting the products of combustion from a power combustion system such as an induced draft furnace. The apparatus includes a housing having three openings and a baffle. One opening in the housing receives the gaseous products of combustion from the power combustion system. A second opening in the housing is connected to a flue pipe which directs the products of combustion from the housing to an outlet vent. The third opening in the housing has a spillage damper or movable panel which can cover the third opening. The panel is pivotally connected to the outside of the housing above the third opening. When the pressure within the housing is less than the surrounding atmospheric pressure the panel is forced closed by this pressure. The panel is forced open and the products of combustion in the housing are vented to the surrounding atmosphere when a pressure greater than the surrounding atmospheric pressure is present within the housing.

Abstract: A flow control device is provided for use with a fan to prevent pressure excursions in a furnace or any other hardware equipment to which the fan is connected. The control device is connected in parallel relation with respect to the fan so that a recirculating flow path is formed between an outlet of the fan and an inlet thereof. This recirculating flow path controls the pressure differential produced by the fan. The control device includes duct work and a controlled element, preferably, a damper. In a furnace system, an induced draft fan is connected in series with a furnace and the controlled device is normally in a closed position in parallel with the induced draft fan. Upon the occurrence of one or more predetermined fault conditions, the controlled device modulates open to provide a circulating path through the induced draft fan and rapidly controls the pressure differential between the inlet and outlet of the fan.

Abstract: A heat shield for hot vertical pipes and, in particular, coke oven ascension pipes. This heat shield includes a lower, open-bottomed cylindrical housing section which peripherally encloses the pipe. Vertically projecting from this housing is an arcuate wall which is spaced from the pipe. The housing is internally partitioned into a warmer space adjacent the pipe and a cooler space remote from the pipe so that a heat dissipating upward draft is established in the housing and between the pipe and the vertical arcuate wall.

Abstract: The present invention relates to a stove of the type having a firebox and a second outer wall that defines an air passageway around the fire-box. Provided with the stove is a fan for forcing air around the defined air passageway for collecting heat from a burning fire within the firebox. A flue is communicatively connected with the firebox and extends therefrom through the defined air passageway and on through the outer wall structure of the stove. Co-axially disposed around the flue and communicatively connected with the air passageway is a vent for directing heated air from the stove. The co-axial relationship of the vent and flue assures that the flue gases must pass within the heated air passing in the vent or vice versa, and this gives rise to a very efficient stove inasmuch as a substantial portion of the heat associated with the flue gases being exhausted is transferred to the vented air.

Abstract: An improved flue box assembly for use with the exhaust gas conduit of a heating plant is provided having a housing with at least one pivotally mounted damper plate therein. The damper plate is provided with a flue opening and at least one bore to permit the creation of a safe amount of back pressure to retain unburned fuel vapors within the heating plant, thereby maximizing fuel efficiency, while simultaneously preventing the build-up and stratification of unburned fuel vapors within the housing.

Abstract: A draft air combustion apparatus for directing substantially all of the draft air provided into a stove pipe for a stove upwardly into the stove pipe, and permitting a small amount of the draft air to flow downwardly into the stove to provide air to an area of combustion of the exhaust gases created by combustion in the stove in a region of the stove near the entrance to the stove pipe. The apparatus of the present invention including a plurality of vane elements located near the entrance of the draft flue to the stove pipe and being oriented parallel to each other and at an angle to direct the draft air upwardly.

Abstract: A heating stove including a pair of opposite side walls and front, rear and top and bottom walls interconnecting and extending between front, rear and top and bottom marginal portions of the side walls. A pair of inner side panels are provided and spaced inwardly of the side walls and extend between the top and bottom walls defining interior side wall hollow areas. A rear inner panel is spaced inward of the rear wall and extends between the rear marginal portions of the inner side panels defining an interior rear wall area. A firebox is defined between the side panels and the rear panel and front wall and includes a flue outlet opening outwardly from an upper rear portion of the firebox. Combustion air inlet structure is provided operative to admit combustion air into the lower portion of the interior rear wall area and the upper portion of the interior rear wall area and the rear upper portions of the interior side wall areas are communicated.

Abstract: A heater venting system in which a draft hood which connects at its upper end to a chimney, which has an open lower end and which has an opening intermediate its upper and lower ends connected to the heater exhaust flue has its open lower end connected for gas flow to a chamber which is open to the building inside air at its upper end and which is connected at its lower end to air outside the building by a damper controlled duct to provide an inside air-outside air interface at, or above the lower end of the hood to restrict the flow of building inside air into the hood.

Abstract: A heating system for dwellings or other enclosures includes a furnace in which a burner is isolated from a hot air or water system, and receives substantially all of its combustion air from outside the enclosure and preheated. A heat exchanger is provided between exhaust gases from the burner of the furnace and the combustion air.

Abstract: A heating system for dwellings or other enclosures includes a furnace in which a burner is isolated from a hot air or water system, and receives substantially all of its combustion air from outside the enclosure and preheated. A heat exchanger is provided between exhaust gases from the burner of the furnace and the combustion air.

Abstract: A balancing air device for a heating unit in a building having a flue for the passage of waste combustion gases from a combustion chamber of the heating unit into a stack capable of having a draft flowing therein, comprising, a fresh outside air line connected to the combustion chamber of the heating unit for supplying air from outside the building and an air return line connected directly between the outside fresh air line and the stack for returning air supplied from outside the building to the stack when the heating unit is not operating. The cross-sectional flow areas of the outside fresh air line extending to the combustion chamber and the air return line are chosen so that, when the heating unit is not operating, the air return line satisfies a substantially constant draft flowing in the stack so that fresh outside air is not supplied to the combustion chamber when the heating unit is not operated.

Abstract: A flue damper and draft regulator for a furnace in which the orientation of the damper is controlled by a vane. One face of the vane is subject to external atmospheric pressure. The other face of the vane is subject to the flue pressure both upstream and downstream from the damper. Exposing the vane to the reduced pressure on the chimney side provides a force which closes the damper when the burner shuts off.

Abstract: A venting system for gas fired heating plants including a diverter box, conduit means for conducting gas from one heating plant upwardly in one leg of an inverted U pattern and downwardly into the second leg of such pattern while admitting air at the bottom of the box to form a heat lock to restrict the flow of air in this pattern, and a second conduit means for conducting gas from a second heating plant upwardly and then downwardly of the second leg of the pattern for the first heating plant to a level at which gas may be passed within the box from the inlet to the outlet of the box, thus providing a structure which avoids the blowing out of the pilot flame in one or another of the heating plants.

Abstract: The specification discloses a mobile home heater taking combustion air from the outside and operable selectively as a stove and a fireplace and being double walled in its back sides and bottom. In operation as a stove, combustion air flows into a bottom passage covering the bottom of the fire chamber, up a back passage covering the back of the fire chamber and down a preheating passage in the back passage and into the lower portion of the fire chamber, secondary air also flowing from the back passage into the upper portion of the fire chamber. For fireplace operation, a door is opened to the fire chamber and also opens ports from the bottom passage to supply air through the door opening, a thermostat controlled damper to the preheating passage closing. An injection tube leads from the back passage into a stack to minimize condensation in low combustion operation, and a second air injection tube in the upper portion of the stack has a thermostat controlled inlet valve closed when the stack is hot.

Abstract: This is a stove primarily for the burning of wood, but also capable of burning other combustible materials, which stove is characterized by a unique combustion chamber, together with a recirculating combustion chamber and baffle for more perfect combustion and characterized by a heat radiating chamber which may be closed so as to be used as an oven, and by a unique damper placement in combination with the exhaust flue pipe so adapted as to automatically activate in order to cool the flue pipe in the event it should exceed safe heat limits.

Abstract: The invention provides, at the end of a pipe which extends a valve being part of an exhausting device for pressure-relieving a pressurized fluid, a nozzle which is exactly at the input of a hood, the convergent portion of said nozzle reducing its exit section so as to make it substantially double the maximum passageway section through the valve.

Abstract: A venting system for the combustion chamber of a gas-fired heating plant has an elongate diverter box arranged vertically of the heating plant exteriorly thereof and having an upper portion and a lower portion with the latter having a bottom provided with a substantial opening disposed well above the base of the heating plant for the free admission of atmospheric air surrounding the heating plant into the diverter box and with the upper portion having selected openings for the reception of horizontally disposed pipings from the flue outlet for the combustion chamber and for the chimney flue with a vertical baffle depending from the closed top of the upper portion a substantial vertical extent into the diverter box and dividing it into a flue outlet section and a chimney flue section with said sections having thermostat means to indicate exteriorly of the sections the temperature of the gases therein and with a safety limit switch housed in the flue outlet section below the lower free end of the baffle and bei

Abstract: An apparatus for reclaiming heat from and for controlling the flow of combustion gases passing through a flue from a heater to an exhaust stack. The apparatus includes an inner housing having first inlet and outlet openings. The first inlet opening is adapted for connection by one section of the flue to the heater, whereby combustion gases from the heater will enter the inner housing through the first inlet opening and will exit therefrom through the first outlet opening. An outer housing at least partially surrounds the inner housing, the said inner and outer housings being spaced one from the other to define an intermediate chamber which is in communication with the inner housing's first outlet opening. The outer housing is provided with a second outlet opening which is aligned with the first outlet opening and in communication with an integral damper housing which is in turn adapted for connection by another flue section to the exhaust stack.

Abstract: A factory-built fireplace for permanent, fully-enclosed installation which takes cooling air from the room in which it is installed, but has no cooling air inlet openings below the front of the hearth. All necessary cooling air enters through openings in the front wall along each side of the combustion chamber into an air passage from which the major portion flows into a space under the hearth floor. After flowing centrally and rearwardly to provide the necessary cooling under the hearth, this air flows upwardly through enclosed spaces at the rear of the combustion chamber to cool this portion of the fireplace. A second portion of the air from the aforementioned air passage may enter enclosed spaces behind the side walls of the combustion chamber to provide the necessary cooling of this portion of the fireplace.

Abstract: A venting system for a warm-air furnace, gasfired boiler or the like heating plant has an open bottom diverter box which is arranged horizontally externally of the heating plant substantially at the level of the top thereof. The top wall of the diverter box at one end section thereof is connected by a vertically upstanding U-shaped, internally unobstructed, ducting to the top of the combustion chamber of the heating plant so that fumes flow therethrough into such combustion chamber end section of the box while the top wall of the diverter box at the other end section is connected by a vertically upstanding, internally unobstructed, piping to the flue.