Abstract: An improved unit (10) which supplies combustion air (A) to a furnace (100) or hot water heater (200) is described. The unit includes a switch (59) which continues the operation of motor (14) and fans (12 and 15) in unit (10) until the hot flue gases (H) are vented and to cool exhaust gas pipe (22) after the furnace and/or hot water heater cease to operate to produce heat.

Abstract: The safety stove includes a stove body having a heating chamber and an air chamber therein. The stove body and chambers are pneumatically sealed. The heating chamber is positioned between the stove top and the air chamber. A burner assembly is mounted beneath the stove top in the heating and air chambers. The burner assembly has a fuel inlet and an air/fuel mixer and a burner. The burner being in the heating chamber, the fuel inlet being in the air chamber. The air/fuel mixer extending between the chambers. The burner assembly is the sole communication between chambers. The chambers are pneumatically isolated from the body. An air inlet duct communicates with the air chamber and the exterior of the body. A combustion product exhaust duct communicates with the heating chamber and the exterior of the body. The heater chamber and the product exhaust duct define an air/combustion product flow path. A fan is mounted within the air/combustion product flow path.

Abstract: This gas-powered apparatus comprises a substantially cylindrical combustion chamber having an inlet for the combustion air connected to the outside and an upper outlet connected to a burned gas flue. A tank is arranged around the combustion chamber and defines therewith an interspace, so that the water in the tank can be heated substantially by radiation. The interspace is downwardly connected to a duct having an opening for a fan sucking air from the enclosed space through the interspace and returning it to the enclosed space.

Abstract: A screen for covering inlet and/or outlet ducts in a heating system in a recreational vehicle for substantially preventing insects and the like from entering the heating system.

Abstract: A power vent for a furnace or the like comprises an air inlet tube having axially opposed ends; one end has an air intake opening which will normally locate outdoors; the opposed end connects to the inlet of a blower, with the outlet of the blower connecting to a vent tube. The flue of the furnace connects to the air inlet tube intermediate the ends thereof. The vent tube may suitably locate coaxilly within the inlet tube. The system will normally be sized such that the ratio of fresh air to flue gas is from about 5:1 to about 50:1, and residence times between the flue entry to the air inlet tube and the blower outlet are low, of the order of 0.01 second, thereby reducing the incidence of condensation and icing in the power vent. The system may be balanced, for example by varying the area of the air intake opening, whereby negative pressures within the furnace are avoided, thereby increasing the efficiency of furnace operation.

Abstract: The fireplace has a coaxial vent directly venting the exhaust gas through its top. The fresh air is directed through an outer jacket of the coaxial vent to a chamber located between the firebox and the rear panel and enters into the lower portion of the firebox while the exhaust air is conducted through the inner coaxial duct, located inside the fresh air duct, to be released to the outdoor. Residual heat in the exhaust gas is inherently recycled by the fresh air being drawn into the fireplace to enhance combustion and to increase the efficiency for heating purposes.

Abstract: An outdoor heating appliance includes a top structure having a top surface, a stationary airfoil, and exhaust openings for flue products. The operation of the heating appliance is rendered wind resistant by generating with the stationary airfoil, in a region above the top surface and in repsonse to wind, an air pressure lower than an air pressure of that wind, and by locating the exhaust openings in that region, whereby the flue products are exhausted from the outdoor heating appliance by the wind. An inlet opening may be provided below the top surface at the airfoil for receiving part of the wind, in order to sustain combustion and generate inside the heating appliance positive pressure toward the exhaust openings by guiding air from the received part of the wind through a channel to a burner in the heating appliance.

Abstract: A furnace roof jack is provided with a pivoting flashing plate which can be attached to pitched roofs having various pitch angles. The roof jack includes an elongated generally cylindrical tube. An enlarged portion of the tube has a generally spherical outer surface. A flashing plate is provided with a hole having a diameter approximately the same as the diameter of the spherical surface. The flashing plate is pivotally attached to the tube on an axis which extends perpendicularly to the axis of the tube along a diameter of the spherical surface.

Abstract: A zero clearance fireplace of the type to be installed inside of a building against or near an outside wall is provided. The box shaped fireplace is provided with four substantially vertical walls, a top wall and a bottom wall. The bottom wall comprises an inner plenum and an outer plenum below the combustion chamber. The rear wall comprises an outer plenum connected to the bottom plenum of the bottom wall, a middle plenum connected to a source of fresh air and connected to the inner plenum of the bottom wall and an inner plenum which is connected to a horizontal exhaust pipe which is inserted through the outside wall and is connected to the combustion chamber through a baffle arrangement.

Abstract: A portable heater comprising a double-wall vessel which forms a combustion chamber and encloses a suitable fuel. Air passages provide an airflow through the vessel for supporting combustion. Also included are endless conduits which entrap displaced fuel to prevent it from escaping from the heater through the air passages. Thus, fuel is prevented from escaping from the heater in all positions of the same in the event that the heater is dropped or otherwise upset. A set of cooling fins, encircling a fuel holder, cool the fuel to help maintain an even burn rate. The heater further includes an adjustable flame attenuator for selective heat control. At a low heat setting the invention may be used as a personal or close contact heater wherein an outer wall serves as a guard for preventing contact burns. A modified embodiment of the heater, for use in a tent, includes an air intake tube and a fuel for exchanging gases with the outside of the tent.

Abstract: A venting system using natural convection cooling is disclosed in which a sleeve is inserted within a flue pipe. The annulus between that sleeve and the flue pipe is sealed at an inside end and the flue pipe is provided with a plurality of vent holes in the periphery of its outer end, which is positioned outside a building. That annulus forms a cooling passage and outside air is drawn through the annulus by a natural convection process to dramatically lower the flue pipe temperature. The outer end of that sleeve is open to a vent hood. An outer wall sleeve is also positioned around the flue pipe and sealed at one end in order to form an annulus containing an insulating air layer. That reduces the heat conduction to the outer wall sleeve, substantially reducing the outer wall sleeve temperature. The venting system also includes a vent hood having a double hood in which the outermost hood is spaced from the inner one.

Abstract: A recreational vehicle, mobile home or the like having several appliances therein which generate heat and/or gases, such vehicle incorporating an integrated venting system. The venting system includes cool air inlets in a lower portion of the vehicle body and a common warm air outlet in another portion of the vehicle body located at a level above the cool air inlet. Means are disposed between the air inlet and the warm air outlet for confining the flow of air and causing such air flow to pass in contact with or in close proximity to the appliances and/or outlets therefrom whereby to remove heat and/or gases from these appliances as the air moves from the air inlet to and through the air outlet.

Abstract: A terminal unit for a balanced flue has an air inlet duct (10) and an outlet duct (20) projecting beyond the mouth of inlet duct. An elliptical plate (30) encloses a region around the outlet duct to inhibit combustion products for entering the inlet duct. Alternatively a circular plate (60) could be used.

Abstract: A device for mounting a gas-fired heating apparatus on a wall and connecting it through a flue for communication with the outside of the wall. The flue comprises inner and outer coaxial tubular members defining inner and outer conduits for carrying combustion supporting air from the exterior to the heating apparatus and combustion gases from the heating apparatus to the exterior. A register admitting combustion supporting air and venting combustion gases is fitted at the free end of the flue remote from the heating apparatus. A support plate has a circular aperture in a base for locating the support plate on the outer coaxial tubular member and wings cooperable with fittings on the heating apparatus for supporting the heating apparatus. A gasket with a retaining collar is received along a portion of the support plate and tightened on the outer coaxial tubular member.

Abstract: A normally energized motor maintains a counterbalanced damper closed to block air inflow in a non-combustion condition of an appliance. Deenergization of the motor by thermostat control releases a rotor for displacement through a limited angular stroke. Through a lost-motion linkage connection the damper is displaced, in lagging relation to the rotor to the open position. The open position of the damper is detected by a sensor to open a fuel valve in the appliance.

Abstract: A control unit for make-up air and combustion air is disclosed for use with a furnace in an air circulating system for a building. A baffle having a combustion air inlet and a make-up air inlet is provided with a weather protective hood and adapted to be mounted on the outside wall of a building. The combustion air inlet is connected through a conduit to a location adjacent the floor of the building on which the furnace is mounted. The baffle includes a restrictor plate including a pair of openings aligned with the combustion air and make-up inlets, respectively, and including a screen extending across the openings. The baffle includes a damper in the make-up air inlet which opens in response to reduced pressure in the furnace return air duct so that the inside pressure tends to be equalized with the outside pressure.

Abstract: A control unit for make-up air and combustion air is disclosed for use with a furnace in an air circulating system for a building. A baffle having a combustion air inlet and a make-up air inlet is provided with a weather protective hood and adapted to be mounted on the outside wall of a building. The combustion air inlet is connected through a conduit to a location adjacent the floor of the building on which the furnace is mounted. The baffle includes a restrictor plate including a pair of openings aligned with the combustion air and make-up air inlets, respectively, and a screen extending across the openings. The baffle includes a damper in the make-up air inlet and a damper in the combustion air inlet. The dampers are mounted on a common shaft so that they move concurrently in response to a pressure differential between the inside and outside.

Abstract: An interior building area containing at least one combustion type heating appliance is equipped with a combustion air inlet having an openable and closable damper operatively associated therewith. The damper is weighted for gravity closing and is suspended from a swinging pivot in a manner to assure a substantially airtight closure for the combustion air inlet. In addition, actuator structure is provided for each combustion-type heating appliance within the interior building area and operatively associated with the damper for moving the latter to an open position responsive to operation of at least one of the heating appliances.

Abstract: A gas burning furnace system is disclosed, including a blower which draws air from outside the home for combustion. The blower forces combustion air to the gas burner via a pressure box situated between the blower and the burner. The pressure box encloses a barrier having an adjustable aperture therein, through which the combustion air must pass before reaching the burner. By adjusting the size of the aperture, the rate of supply of combustion air to the burner can be regulated so as to produce complete fuel combustion without cooling the firebox.

Abstract: An external intake-discharge duct for a burner-operated refrigerator having a sealed system. The intake communicates with the atmosphere outside of a trailer or a motor home and is located in a service door for the burner of a refrigerating apparatus. Atmospheric air is conducted downward through the air intake to the burner, and hot combustion gases are conducted upwards through a flue pipe and out through a discharge or outlet. The duct terminates in a cap-like structure located externally in a wall of a trailer or motor home.

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 combination powered flue products exhaust and preheated combustion air supply assembly is provided for use in association with a heating furnace so that flue exhaust products are given a positive exhaust to the outside while a balanced pre-heated combustion air supply is simultaneously and positively pulled inside. A compartmented main housing is provided having flue products exhaust and combustion air compartments. A flue products exhaust fan is provided in the flue products exhaust compartment and a simultaneously activated and driven combustion air intake fan is provided in the combustion air compartment. An outside air intake pipe is connected to the main housing so as to deliver combustion air to the combustion air compartment for delivery to the furnace area upon selective activation of the combustion air intake fan.

Abstract: A room space such as a caravan is provided with a gas fired space heater having an upright casing within which is located a sealed surface combustion unit having a radiant plaque on one side of which gas is burnt. Primary and secondary air for combustion are fed from inlets below the floor of the room to appropriate sides of the plaque. The products of combustion pass upwardly to an upper part of the casing and then are deflected by a baffle sideways and downwardly to an outlet located below the plaque and below the floor of the room.

Abstract: This invention is an enclosure for the part of a gas heater vent which protrudes on the outside of a wall of the building in which the gas heater is installed. It consists of a sheet metal rectangular baffle which encloses the front, sides, and part of the top of the vent part, and is attached to the wall of the building. A variation of the invention provides for the easy removal and reattachment of the baffle; and another variation fully encloses the top and bottom of the baffle; provides a chimney for the discharge of gases at the top of the baffle, and a rain and snow shield for the top of the chimney.

Abstract: A furnace shell has a fire pot centrally located therein, the walls of the shell and fire pot being spaced to form a fluid heat transfer chamber therebetween. Heat transfer is effected between the pot and the chamber to heat the fluid medium in the chamber. The shell is located in an interior to be heated, such as a building or home, including mobile and motor homes. An inlet conduit has a first end exteriorly positioned of the building interior and a second end substantially pneumatically sealed from the interior and in fluid communication with the fire pot enclosure to provide combustion supporting fluid exclusively from the exterior. A flue has a first end positioned exteriorly of said interior and a second end positioned in the upper portion of the fire pot enclosure to conduct combustion gases to the exterior. The flue is pneumatically sealed from the interior to prevent combustion gases from entering the interior.

Abstract: A self-cleaning heat exchanger in combination with a home furnace system which draws combustion air from outside the home is disclosed. Gases of combustion are drawn up through a plurality of vertical tubes and out a chimney by a fan mounted in the chimney. The lower portions of the tubes are cooled by inside air drawn over them by the return air blower of the furnace, the upper portions of the tubes are cooled by cold outside air drawn across them by the furnace burner unit. Moisture which condenses in the upper portions of the tubes is drawn down through them by gravity. The higher temperature in the lower part of the tubes causes this condensate to revaporize and rise to the upper portion of the tubes, where the process repeats itself. As more water vapor enters the tubes in the flue gas, distilled condensate eventually drops out of the tubes and runs into a drain at the lower end of the heat exchanger.

Abstract: A radiant heater for burning firewood and the like to heat a living space such as a mobile home or house including an enclosure with a combustion compartment for the burning of the firewood placed in the combustion compartment, a flue pipe positioned outside the living space, an exhaust pipe extending through a wall of the living space and connecting the combustion compartment with the flue pipe, an outside air inlet having an opening to the outside wall surrounding the portion of the exhaust pipe extending through the wall to permit the exterior air coming through the inlet to cool the exhaust pipe and prevent overheating of the wall adjacent the exhaust pipe, an air passageway connecting the air inlet compartment with the combustion chamber, a thermostatically controlled damper in the passageway to control the rate of flow of air to the combustion compartment to achieve a desired heat output thereby providing a thermostatically controlled wood burning radiant heater which utilizes only outside air and autom

Abstract: This invention provides a device for use with oil or gas fired furnaces in buildings and more particularly homes to enchance heat efficiency, the device being adapted for installation in an air supply leading from outside the building to the furnace cold air return so that outside air passes through the device, the device including a cylindrical inlet portion, means of defining a chamber attached to the downstream end of the inlet portion and having an internal cross section larger than that of the inlet portion, a frustro-conical section coupled to the chamber means remote from the inlet portion for carrying air from the chamber towards the furnace and converging towards the furnace, a valve assembly to adjust air flow and a baffle plate fixedly positioned at the junction of the chamber means and the frustro-conical section to combine with the valve assembly to inhibit sudden air flow changes caused by pressure fluctuations.

Abstract: A heat exchanger assembly for an undercounter furnace includes first and second complementary, flanged sidewalls shaped to provide a fire chamber. Integral lower combustion air intake and upper exhaust flue are formed from the same sheet metal as the sidewalls. The width of the fire chamber is less than its height and length. A circulating fan is located behind the fire chamber and between the intake and flue ducts, taking room air from the rear of the casing and forcing it forwardly to sweep over both sidewalls and into the room to be heated. The heat exchanger is mounted to a removable chassis.

Abstract: A kit for converting presently used household or light commercial furnaces of the oil or gas type which inefficiently consume unnecessarily large quantities of fuel, to a more efficient mode of operation wherein smaller quantities of fuel are consumed. The kit comprises prefabricated components which can be easily attached to the furnace in such a way that fresh air is brought in from the outside to support the combustion process, and meet the needs of the draft diverter, rather than using already heated and/or humidified air as is done in presently existing systems.

Abstract: A heat operated refrigerator having a gas burner and a flue pipe, a fresh air intake conduit and a combustion gas conduit connected to the flue pipe, with the gas burner, flue pipe, and conduits forming a sealed combustion system that is separated from the space to be cooled. The fresh air intake conduit and the combustion gas conduit are so constructed and arranged to pass through a wall or roof whereby upon movements of the air about the ends of the conduits adjacent to the atmosphere a higher static pressure prevails in the opening of the fresh air conduit than in the opening of the combustion gas conduit. Thus, the ambient air variations in pressure do not affect the air flow through the sealed combustion system to such an extent that the burner flame is extinguished.

Abstract: A fireplace having means for the injection of combustion and necessary dilution air consisting of a pair of louvered chambers positioned on each side of the front of the fireplace. Deflectors associated with the louvers direct the air inward and upward, whereby streams of air from the two louvered chambers combine in the central upper region of the fireplace opening and enter the fireplace. The supplemental air is obtained from outside the building housing the fireplace through a cased inlet or inlets on the outside wall of the building, the casing having an air entrance face which is outward of the wall by a dimension of approximately 1/4 to 3/4 inch.

Abstract: A heating system having a furnace which intakes air for combustion purposes, and produces exhaust gases which are emitted through a flue pipe. One coupling device interconnects a draft opening in the flue pipe with the exterior of the building for allowing air outside of the building to provide the draft for the flue pipe. A second coupling device interconnects the air intake with the outside of the building for allowing use of air outside of the building as the air supply for the furnace.

Abstract: Apparatus and method for reducing the flow of convection currents into and throughout the interior of a building during and after the time hot exhaust gases from the furnace are discharged through the chimney by utilizing a passage means to bring in outside air directly to the chimney without mixing it with air in the interior of the building.

Abstract: An improvement in refrigerators of the absorber type in which heat from a flame circulates the refrigerant in the refrigerating cycle, particularly for use in caravans. To prevent the flame being extinguished in draughty conditions there is provided shielding means for protecting the flame, a flue extending from above the flame upwardly to an exit into ambient air, and means at the flue exit such as a venturi device adapted to provide a reduction of pressure from ambient air to the interior of the flue in draughty conditions of the ambient air. Preferably, the shielding means totally encloses the flame and is provided with an inlet connection pipe adapted to provide access for ambient air to the interior of the shielding means, the entrance to the inlet connection pipe having baffles and foils adapted to prevent any reduction of pressure from ambient air to the inlet connection pipe interior in draughty conditions of the ambient air.

Abstract: An air terminal for a horizontal vent of a sealed combustion furnace includes a faceplate for mounting to an exterior vertical wall. A horizontal flue pipe extension, receiving the combustion products, is surrounded by an oval sleeve. Fresh air is communicated to the furnace through the space between the flue pipe and the sleeve. The outlet of the flue pipe is at least about 3/4 in. outside the faceplate. An enlarged fresh air intake opening exists about the flue pipe, and a pocket-shaped rain shield is located beneath the flue pipe extending upwardly and inwardly. A horizontal wind deflector vane is located beneath the flue pipe and extends across the width of the fresh air intake opening for directing incident wind downwardly along the wall. The terminal improves operation of the furnace under all wind conditions, whether the furnace is operating on pilot or main burner modes.

Abstract: A gas-fired, infrared space-heater which is compact and has "sealed combustion", and which is particularly suited for small recreational vehicles and for boating and camping installations. A vent for the products of combustion is provided through a flue which is surrounded by a concentric fresh air inlet pipe which provides a heat-exchange relationship to heat the incoming air by the gases being exhausted.