Abstract: A method and an arrangement for reducing emissions of nitrogen oxides in a combustion apparatus provided with a tubular furnace. The method comprises burning odor gases at first sub-stoichiometrically, and subsequently supplying additional air to the furnace (3) in the transverse direction thereof in such a manner that the final air ratio is over 1. The arrangement comprises an additional air duct (7) which extends to the furnace of the boiler and from which additional air is supplied to the furnace (3) in the transverse direction of the furnace (3).

Abstract: A portable space heater in which a fuel discharge nozzle discharges fuel into a combustion chamber from a fuel tank. A rigid non-flexible metal tube extends between the nozzle and tank. The tank includes an opening with a closure member in the opening. The closure member includes an opening into which a tube compression fitting can be secured for securely affixing one end of the tubing. In the preferred embodiment, the tank is plastic and the closure member is an insert which is insert molded into the top of the tank. In another embodiment, the tank can be metal with the closure member welded to the top wall thereof. In still another embodiment, the closure member is a cap threaded on a threaded opening. In all embodiments, the fuel filter is located inside the tank and is accessible by withdrawing it from the tank through an opening in the insert.

Abstract: A multi oil furnace is disclosed wherein the external cabinet shell houses a central burner chamber, an upper bank of conduits and a lower bank of conduits. Headers operably coupling the burner chamber, the upper and lower banks of conduits and a discharge opening define a flow path for the combustion gases created by the ignition of the used oil within the burner chamber. A ventilation chamber positioned between forward and rearward headers allows the passage of ambient ventilation air around the conduits and the burner chamber to effect a transfer of heat from the exhaust gases to the ventilation air while maintaining isolation therebetween.

Abstract: A heat exchanger for a multi oil furnace is disclosed wherein the external cabinet shell houses a central ventilation chamber divided into inlet and outlet sides by a generally vertical barrier. Combustion gases flow from the burner chamber into an upper bank of conduits and a lower bank of conduits, all of which pass horizontally through the ventilation chamber. Headers operably coupling the burner chamber, the upper and lower banks of conduits and a discharge opening define a flow path for the combustion gases created by the ignition of the used oil within the burner chamber. By positioning the burner chamber vertically between the upper and lower banks of conduits, the ambient ventilation air must pass over the burner chamber and the upper and lower banks of conduits twice while passing through the ventilation chamber, thereby providing a 360 degree loop of heat exchange.

Abstract: A multi oil furnace is disclosed wherein the front door is sealable against the burner chamber and against a lip extending around the circumference of a front header formed in the cabinet shell to operatively interconnect an upper bank of heat exchanger conduits with a lower bank of heat exchanger conduits. The exhaust gases flow from the burner chamber into the upper bank of conduits to the front header where the exhaust gases must flow around the burner chamber to the lower bank of heat exchanger conduits. The lip extending around the periphery of the front header is recessed below the lower bank of conduits to permit an accumulation of ash precipitated from the exhaust gases. The front door carries longitudinally offset sealing surfaces to seal against both the burner chamber and the header lip. Both the upper and lower banks of conduits, the burner chamber and the front header are accessible through the opening corresponding to the front door when moved to its opened position.

Abstract: A belled orifice inlet plate is provided for an induced draft combustion furnace heat exchanger of the type in which an inshot burner produces a hot gaseous combustion that is injected through an opening in the inlet plate into a combustion zone in the heat exchanger. The inlet plate has a flared collar that surrounds the opening at its periphery, and which extends a predetermined distance into the combustion zone. Preferably, the collar should have a depth on the order of one-quarter inch to one-half inch, and the flared portion should have a radius of curvature on the order of about one-quarter inch.

Abstract: This invention provides improved gas-fired heater means for supplying heat to a space, such as a room, house, building, vehicle, or the like.

Abstract: A self-contained, free standing, on-demand, woodburning furnace including a firebox (52), including means to force combustion gases through a manifold (68), a hot air gathering plenum and means to selectively force feed the fire (34, 36, 38, 40, 68) and draw heated air from the furnace (8, 10, 12, 14).

Abstract: A solid fuel furnace having an oscillating grate plate solid fuel burner therein wherein the grate plates are in a stepped arrangement and every other plate moves together, in an opposite direction from the adjacent plates so that the solid fuel is kept moving down the step grate positively. Additionally, the solid fuel burner is mounted in a furnace housing which is designed to utilize the hot combustion gases to preheat incoming or makeup air for a blower used for supply air flow for heating. Baffles are used to provide a substantially elongated path for the combustion gases to ensure adequate heat exchange in a compact space.

Abstract: A jacketed wood burning stove of the type having an inner firebox door and an outer jacket door in front of the firebox door and wherein a flash inhibitor is provided consisting of a relatively small auxiliary firebox door which is manually biased open but is held closed by an engaging bracket on the outer jacket door when the outer jacket door is closed.

Abstract: The disclosure is directed to a furnace having an elongate, cylindrical, combustion chamber surrounded by a water jacket. Air is blown into the combustion chamber through a loop-shaped distributor having a front bight and a rear bight and parallel horizontal side members. Axially-oriented jet ports are disposed in said bights which direct jets of air toward each other into the center portion of the combustion chamber and chord-oriented jet ports in the side members which direct jets of air downwardly toward the bottom center of the combustion chamber. Fire-tubes are located in the top portion of the water jacket through which the combustion products flow in heat exchange with the water introduced into the water jacket and second fire-tubes in heat exchange with the outlet water lead the combustion gases to a stack. A special band of scraper-deflectors is provided on at least some of the fire-tubes.

Abstract: The present invention relates to a parabolic shaped heater comprising a parabolically shaped lower wall structure enclosed by a horizontal heat collector panel, and wherein this enclosure defines a generally closed firebox for supporting fuel in the form of wood, coal and the like. Further, there is provided a hood that is suspended about an upper portion of the firebox and extends generally downwardly therearound, and is spaced outwardly therefrom such that air may be induced upwardly between the parabolic firebox and the hood, and over the heat collector panel so as to effectuate an efficient heat transferred between the firebox and the passing air. Finally, a central heat distributing system may be operatively associated with said hood for directing air therefrom to other parts of the structure housing said parabolic heater.

Abstract: An improved combustion chamber comprises a shell having a circular array of integral teeth formed at one end thereof. Shrunkfit onto said shell end at or near the roots of the teeth is a ring. The toothed end of the shell is received in an opening in a sheet header so that the ring engages against the header sheet and a continuous weld bead is formed between the ring and the header sheet all around the shell. The shell teeth are bent radially outward and engage the header sheet on the opposite side thereof from the ring so as to be in intimate thermal heat exchange contact with the sheet and these teeth are also welded to the header sheet. The aforesaid engagement between the chamber and rear head minimizes stresses on hot end of the chamber and prolong its useful life. Means engaged around the opposite end of the shell supports, and yet permits lengthwise movement of, that end of the shell.

Abstract: Fireplace furnace apparatus includes separate air systems for combustion and for heating and the combustion gases flow from a primary combustion chamber into a secondary combustion chamber and into additional settling chambers for particulate matter and the heated air flows through finned chambers adjacent the chambers through which the combustion air flows.

Abstract: A high efficiency furnace is provided for a forced air heating system having a furnace housing which is open at its lower end to cold air return means for the heating system and is open near its top to hot air exhaust means for the heating system. The furnace includes a burner housing contained within the furnace housing and adapted to receive and to burn a combustible fuel. A heat exchanger housing is positioned on top of the burner housing and the interiors of the burner and heat exchanger housings communicate with each other by means of a pipe. An exhaust means is provided for exhausting combustion products from the interior of the heat exchanger housing and comprises a substantially horizontal tube extending through the interior of the heat exchanger housing. The tube is open at one end to a flue outside the furnace housing and at the other end includes an opening open to the interior of the heat exchanger housing.

Abstract: This invention is a device for use in increasing the efficiency of existing heating units. This heat exchanger consists of conduits for channeling the furnace or wood stove exhausts in an extended pattern. Cold air is pumped into the heat exchanger at a point at which the exhaust smoke is released up the chimney. The cold air is channeled around the smoke containing flues by a thermostatically-controlled fan and baffles found in the heat exchanger. This air exits the heat exchanger at a point at which the smoke enters it. This heat exchanger puts out temperatures in excess of 450.degree. F. As depicted in the preferred embodiment, only by way of example, the heat exchanger is extremely lightweight and made of galvanized steel with caps at either end to facilitate cleaning.