Abstract: A draft inducer blower assembly includes a blower having a fan, a dilution air intake passage, an exhaust gas intake passage, and a discharge passage. The blower is configured to operatively connect to a heater system in a manner to facilitate flow of combustion air into a combustion chamber and to draw dilution air into the blower and to mix the dilution air with the exhaust gases and to facilitate flow of the mixed air and exhaust gases through the vent. The dilution air intake passage is positionable in at least a low flow configuration and a high flow configuration. The dilution air intake passage is more restrictive of intake of dilution air in the low flow configuration than in the high flow configuration.

Abstract: A sealed chimney damper is provided for preventing flow of air between an interior and exterior of a structure through a chimney. The sealed damper includes a damper body having an inlet aperture and an outlet aperture; an upper flange formed around the outlet aperture of the damper body; a valve plate hingedly secured to the damper body adjacent the outlet aperture, the valve plate sized to substantially cover the outlet aperture when the valve plate is in a closed position; and a gasket secured to the upper flange of the damper body and surrounding the outlet aperture, wherein the gasket is positioned between the valve plate and damper body when the valve plate is in a closed position.

Abstract: The present subject matter provides a damper valve. The damper valve includes an outer sleeve and an inner sleeve. The inner sleeve is positioned within the outer sleeve and is pivotable between a first position and a second position within the outer sleeve. Radial openings of the inner sleeve align with radial openings of the outer sleeve when the inner sleeve is in the first position, and axial openings of the inner sleeve align with axial openings of the outer sleeve when the inner sleeve is in the second position. A related heat pump water heater appliance is also provided.

Abstract: A cooking oven structure of conventional construction having a top vent provided thru an upper portion of the oven wall forming a cooking cavity, a bottom vent formed thru a lower portion of the wall, a chimney mounted on an exterior portion of the wall and exiting adjacent a top portion of the oven structure and communicating with the top and bottom cavity vents, and a damper mounted in the chimney and having a right angle configuration and pivotal about its apex to (a) a first position blocking gas flow both thru the top cavity vent and the chimney, (b) a second position blocking gas flow only thru the top cavity vent, and (c) a third position blocking gas flow only thru the chimney.

Abstract: An air flow modulating device comprising a flapper, a mount and a conduit. The conduit may be T-shaped and may be attached to an intake conduit of a sealed combustion condensing appliance, or other appliance having an air intake conduit, through a first portion of T-shaped conduit. The mount may be connected to a second portion of T-shaped conduit and the flapper may rotate between an open position and a closed position about an axle of the mount. The device operates to allow for a sealed combustion condensing appliance to immediately intake interior air when an exterior air source is obstructed, limited or reduced, or in response to changes in air pressure due to uncontrollable natural forces.

Abstract: The present invention relates generally to 90% Annual Fuel Utilization Efficiency gas or oil burning devices that depend on external air for combustion. More particularly it discloses an alternate intake apparatus for air for combustion that opens automatically when the inlet air conduit from outside is blocked or severely restricted.

Abstract: A candle fuel element includes a wick-holder assembly having a longitudinally disposed wick spaced from a heat-conductive element and a first solid fuel charge disposed between the wick and the heat-conductive element. A second solid fuel charge slidably engages and at least partly surrounds the wick-holder assembly. The heat-conductive element is disposed between the first solid fuel charge and the second solid fuel charge. The heat-conductive element defines a lateral opening adapted to allow fluid communication between the first solid fuel charge and the second solid fuel charge.

Abstract: A device for arresting spark and ash issuing from, and precisely controlling the ventilation of and temperature inside, a heat source-containing vessel such as a cooking grill, stove, oven, cooker, fireplace, heater, or firebox. The device comprises a spark arrestor assembly including a base plate, a cover plate, and a spark arrestor. The base plate defines an opening. The cover plate and spark arrestor are slidably mated in two channels formed in the base plate around the opening. The cover plate and spark arrestor may be adjusted to extend across or only partway across the opening as selected by a user of the device. Tabs are provided on the cover plate and spark arrestor for easy adjustment thereof. Tabs in the base plate are positioned to define a range of slidable motion of the cover plate and spark arrestor.

Abstract: A gas-exhausting module structure includes a casing having a first open end and a second open end. An air-exhausting channel is defined within the casing. The air-exhausting channel has an upper opening that is lower than the second open end of the casing. A blower comprising a chamber, an air outlet, and an air inlet is provided. The blower is in communication with the air-exhausting channel. The air inlet of the blower is connected to an air-sucking box. When power of the blower is turned on, it sucks air into the air-exhausting channel and expels high-pressure air through the upper opening of the air-exhausting channel.

Abstract: A device is shown for transporting asphalt repair materials for use in repairing potholes in asphalt pavements. The device has a body with a hopper compartment for transporting and dispensing asphalt mix materials. A dry, radiant heat source is located in a heating chamber below the hopper compartment and heats the asphalt mix. Exhaust stacks in communication with the dry heat means have a damper system for retaining heat within the heating chamber, the damper system being electronically controlled in response to the temperature within the body of the device.

Abstract: The invention is directed to a thermodynamically activated flue damper for a gas water heater that includes a flue damper for controlling the passage of exhaust gases through the flue; and a thermally sensitive member that is capable of contracting when the exhaust gasses in the flue heat the thermally sensitive member to its transition temperature and expanding when the temperature of the thermally sensitive material falls below its transition temperature. The thermally sensitive member is connected between the flue damper and a support member in the flue to control the pivoting of the flue damper as the thermally sensitive metal expands or contracts at the transition temperature. The flue damper system may also include a counter-balancing member to provide a counter-balancing force to the said thermally sensitive metal, such as a coil spring. The thermally sensitive member may be formed in the shape such as a rod, a wire, and an elongated bar, and may be made from Nytinol or other similar metals.

Abstract: A woodstove emission controller for conveniently drawing emissions from the wood-stove so that the emissions do not enter the room where the wood-stove is located. The woodstove emission controller includes a tubular member having an inlet end, an outlet end and a bore extending therethrough; and also includes a closure member securely disposed in the bore near the outlet end for preventing a back-draft of emissions; and further includes a fan member securely and rotatably disposed in the bore for drawing emissions in through the inlet end and out through the outlet end of the tubular member; and also includes a motor mounted to the exterior of the tubular member, a belt member carried by the motor and the fan member, and a switch for energizing the motor.

Abstract: A flue heater is detachably secured to the flue of a chimney. The flue heater uses an electrical power source to create heat and direct the heated air into the lower portion of a flue. The device can be attached to the flue before igniting a fire and removed immediately prior to lighting a fire. The device can be used with any pre-existing chimney without the need for any large expense in retrofitting a permanent flue heater.

Abstract: The present invention is directed to a sealed vent terminal assembly intended for use in association with high-efficiency oil fired furnaces or boilers. The terminal assembly of the present invention is designed to simultaneously flow outside combustion air to the furnace or boiler and eject combustion gases discharged from the furnace or boiler.

Abstract: A method of connecting a heat exchanger to a forced air furnace is described. Firstly, connect a valve to the hot exhaust gas outlet of a furnace. The valve has a generally "L" shaped valve body. The valve body includes a primary passage. A diversion passage intersects the primary passage. A diversion return port intersects the primary passage downstream of the diversion passage. A butterfly valve member is pivotally mounted at the intersection of the primary passage and the diversion passage. The valve member has a first wing and a second wing. The valve has an open position and a closed position. The valve member is normally in the open position. Secondly, connect a fresh air outlet of a heat exchanger to a fresh air inlet on the furnace.

Abstract: A smokestack addition to a conventional outdoor type of domestic grill is shown that provides a suction at the outlet from the cooking zone of the grill to pull the products of combustion arising from the operation of the grill which suction of the gasses is effective to minimize the circulation of carcinogens in such gasses from flowing over the food being cooked and directs the these effluent gasses over an afterburner associated with the stack that functions to initiate the oxidation of substantially all of the pollutants that flow away from the cooking zone and through the stack to be to be discharged into the atmosphere.

Abstract: A smokestack addition to a conventional outdoor type of domestic grill is shown that provides a suction at the outlet from the cooking zone of the grill to pull the products of combustion arising from the operation of the grill which suction of the gasses is effective to minimize the circulation of carcinogens in such gasses from flowing over the food being cooked and directs the these effluent gasses over an afterburner associated with the stack that functions to initiate the oxidation of substantially all of the pollutants that flow away from the cooking zone and through the stack to be to be discharged into the atmosphere.

Abstract: A fireplace and top wall assembly is disclosed. The top wall assembly includes primary and secondary aligned flue outlet assemblies that form between them a primary air conduit and a secondary flue gas conduit. Both of the conduits are designed to be mounted in fluid communication with the inlet opening of a chimney flue of a fireplace. Flue gases are drawn from the combustion chamber of the fireplace through the secondary flue gas conduit to mix air drawn in by the primary air conduit to promote cooling of the top wall assembly and surrounding fireplace structure.

Abstract: A power vented direct vent system for a fuel-burning appliance wherein a power venter is associated with a vent pipe to create adequate draft for combustion. Outside air is supplied to the appliance for combustion and also communicates through a regulator with the vent pipe for addition to the flue gases. The draft regulator assures adequate draft and can be a barometric draft control. The power vented direct vent system is directly connected to the fuel-burning appliance with complete isolation of the combustion system from the space in which the appliance is located.

Abstract: The apparatus for heating and generating infrared rays has a heating apparatus for indirectly heating a heat medium such as air and water, by a combustion heat and a radiator, wherein a branch combustion gas passage is provided for a combustion gas passage through which the combustion gas in said heating apparatus flows at temperatures of 400.degree. C. or more and 800.degree. C. or less, and said branch combustion gas passage and said radiator are connected.

Abstract: A vent cap for a heat treating furnace provides bidirectional pressure relief. The cap is weighted and balanced over the furnace vent such that the vent is closed as long as the furnace has a slightly positive internal pressure. If the internal pressure exceeds a preselected upper limit the cap opens the vent to relieve the overpressure. The vent cap has a controlled inlet which opens to equalize the pressure differential if the internal pressure falls below a preselected lower limit below the ambient pressure outside the furnace. Such controlled equalization prevents the formation of undesirable combustible mixtures of air and treating gas in the furnace.

Abstract: A heat exchanger comprising a burner in a vertical heating chamber, having openings along its upper end to horizontally extending coils which pass through a plurality of heat transfer fins, the coils opening near the bottom edge of the assembly to a horizontally extending collector tube, open at one end and closed at the other. The open end of the collector tube opens to a vertical tubular stack through which outside air is blown past the opening to the collector tube thus creating a vacuum at that point to draw heated air from the heating chamber and through the coils where the heat is taken up by the heat transfer fins and transferred to air flowing through a hot air duct of a heating system in which the heat exchanger is placed. A blower connected in the bottom portion of the vertical stack draws outside air into the stack through an intake conduit at the bottom end and out through an exhaust conduit at the upper end of the stack.

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 self-tapping duct fitting (10) in the form of a hollow sleeve having an interrupted cutting edge (20) at a one end (14) so that a hole (68) can be cut in a wall (66) of the duct by a rotative motion of the fitting. Preferably, the interrupted cutting edge (20) includes a plurality of teeth (22) which can form tabs bendable against the inner surface (72) of the duct wall (66) once a hole (68) has been cut in order to retain fitting (10) in place.

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 safety stovepipe damper assembly designed for use with a conventional type stovepipe and damper as used on coal, wood, or waste burning stoves. Provisions are made for presetting the damper to a specific low fire or closed position. A latch is also provided to hold the damper at an open position when desired. A heat activated means of releasing the damper from an open damper position is contained within the safety assembly. When activated by abnormally high stovepipe temperatures, the damper returns by gravity to its preset or closed position. The safety assembly can be used on vertically or horizontally installed stovepipe and damper assemblies in all sizes.

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: A mechanical draft controller integrated in the draft hood of a furnace and coupled to a flue damper is responsive to the draft in the flue for controlling exhaust stack heat loss and eliminating heated room air loss via the draft hood under normal operating conditions. The pressure-sensitive controller is variably positioned as a face damper on a surface of the draft hood and is coupled to the flue damper by means of mechanical linkage. Increasing pressure in the draft hood caused by a reduction in the draft value due to partial flue blockage, large down draft, etc., displaces the pivoted controller resulting in a corresponding opening of the flue damper to re-establish the desired draft value. Similarly, excessive draft causes the displacement of the controller in an opposite direction resulting in flue damper displacement so as to reduce the draft value and exhaust stack heat loss.

Abstract: Method and apparatus for regulating the flue draft in heating systems including a combustion volume, a flue communicating with the combustion volume, and a vent opening between heated ambient air and the flue, the regulation being accomplished by sensing the flow of air through the vent into the flue, and modulating the setting of a downstream damper to maintain such flow at a predetermined, positive but minimal value. A particularly preferred embodiment includes a temperature sensor positioned at the flue side of the vent and connected to a control system to maintain the damper at such a position that the temperature at such location is at a predetermined value above that of the ambient air temperature, and thus indicative of flow of ambient air into the flue at minimal values approaching incipient spillage of combustion gases at the vent.

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 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 damper type control for furnace flues which opens with commencement of oil burner operation and closes when combustion ceases. The damper is operated solely by the presence of draft created by the oil burner blower, and closes in the absence of such draft under the influence of a counterweight. With the occurrence of wind passing the open end of the flue, the pressure differential on either side of the damper also assists in maintaining the damper in closed condition.

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 housing structure with a single pivoted damper member is provided as a replacement for the draft hood associated respectively with the flue outlet and vent pipe inlet in a gas heater system. The normal flue outlet for the gas system connects to a first passage in the housing and the normal overhead vent inlet connects to a second passage in the housing above the first passage. First ends of the passages adjacent to their connections to the flue outlet and vent pipe inlet are closed off and second ends open out in a common plane. Communicating with the second ends is an ambient atmosphere opening so that under conditions where the second ends of the passages are open, proper exhausting of gases passing up through the flue to the vent takes place. The single damper itself is mounted to swing in a manner to close off both passages simultaneously when in a first position and also isolate these passages from the ambient atmosphere inlet. In this first position, heat is retained in the heater as well as the room.

Abstract: This is a new fireplace, which is either constructed in place or is totally prefabricated in advance and placed within a building where desired. The fireplace is particularly characterized by a pair of overlapping hollow members placed within the throat of the fireplace above the combustion chamber, which hollow members are interconnected on each side to ducts, one side of which receives cool air and the other side of which expels hot air. Blowers are provided in the duct lines in order to force the hot air into the areas desired for maximum heating.

Abstract: Automatic damper having pivotal semi-circular vanes which are moved to open position by pivotal movement of a longitudinal element disposed along the central gap between the vanes. The movement of the longitudinal element is controlled by a temperature responsive element. Retraction of the longitudinal element causes closing of the vanes. A J-slot arrangement locks the vanes in open position.

Abstract: A wood burning fireplace in which exterior air is heated during flow through a chimney hood. Recirculated air from the room is drawn in and mixed with the heated fresh air in a zone formed between the chimney hood and a decorative hood casing. A linked damper arrangement is provided with one damper on the chimney pipe to control the fire draught and one on the fresh air inlet so that the amount of fresh air admitted is proportional to the amount of air extracted from the room.