Abstract: A self-regulating forced-air heater includes a housing in which is located an air passageway. A blower forces air through the air passageway, including into and out of a combustion chamber. A burner disposed within the combustion chamber combusts a fuel and air mixture to heat the air exiting of the combustion chamber. A venturi effect is used to draw the fuel and air mixture through the burner and into the combustion chamber. An adjustable venturi plate assembly is positioned between the blower and the burner, and expands or contracts in surface area to increasingly or decreasingly block the center of the air passageway. A control assembly includes an electronically controlled valve, an electronic controller, an electrical actuator, and a temperature sensor. The electronic controller monitors the temperature sensor, determines if an adjustment is needed in heat output, and in response thereto, adjusts the temperature of the air exiting the self-regulating forced-air heater.

Abstract: A gas radiant tube heater and method of operating the heater. The heater has a housing and a radiant tube mounted within the housing. The heater further has a modular control box mounted within the housing in which serviceable parts can be easily removed as a unit and replaced. The housing and control box are sealed against the elements for outdoor as well as indoor use. The control box is divided into two chambers, with the inlet air flowing from a first chamber into a second chamber. The first chamber is subjected to a vacuum pressure, in which the heat sensitive equipment is mounted, and the second chamber is subjected to a positive pressure, in which the combustible gas and air mix prior to combustion. The heater further has a pressure switch to shut off the gas supply if the air flow through the heater is blocked, and a flame sensor to shut off the gas supply if the ignition element fails to ignite the air/gas mixture.

Abstract: The elbow between the discharge end of the draft inducer and a horizontal vent pipe is provided with a well structure on the lower side of its discharge end such that condensate forming in the vent pipe is prevented from passing through the elbow into the draft inducer housing. The well structure, in addition to restraining the flow of the condensate, provides for the draining off thereof, and presents a minimal restriction to the flow of flue gases flowing to the elbow. Provision is also made for maintaining a tight seal between a rectangularly shaped inlet lip of the elbow and a rectangularly shaped discharge end of the inducer housing by making the inlet lip of varying thicknesses, with the lip being thinnest at its corners and thickest at its side midpoints.

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 compact, high efficiency condensing furnace includes a combustion chamber and a pair of radiators. The temperature of the combustion gases is reduced in one of the radiators to the point at which combustion products condense, thereby extracting the latent heat of vaporization from these combustion products. Each of the radiators has an inlet and an outlet and a baffle between the inlet and outlet to prevent combustion gases from passing directly from the inlet to the outlet. Additional turbulence-providing baffles can be provided within the radiators if desired. A combustion air inlet pipe extends through a recess in the bottom of each radiator to the combustion chamber, and a gas burner tube extends generally concentrically within the combustion air inlet pipe to provide a gas flame within the combustion chamber. A flame spreader plate directs the flame toward the bottom of the combustion chamber.

Abstract: Portable air heating apparatus for supplying heated air to a plenum chamber including a partitioned housing with at least two chambers, one of which is sound-conditioned to contain a power member, the housing having therein a blower and radiator connected to the sound-conditioned power member, a heat exchanger communicating with the blower, heated air passing from the heat exchanger in the housing to the plenum chamber and recirculated therefrom back to the housing over the radiator before returning to the blower.

Abstract: An apparatus for controlling the speed of a combustion blower motor includes first means for generating an output signal representative of a differential pressure. A second means provides a second signal representative of a desired airflow output of the blower and a summation circuit receives the first signal and the second signal and generates a command signal in response thereto. A power output circuit receives the command signal and responsively provides a regulated level of power to the motor for controlling the speed thereof. The first means may be embodied as a diaphragm-type differential pressure transmitter while the second means may be embodied as an adjustable voltage source or as a source which provides an output signal representative of a temperature.

Abstract: An improved solid fuel burning stove arrangement to heat a selected space including a housing defining a combustion chamber, with an access door thereto for providing fuel to the chamber, a tubular combustion air sparger located longitudinally in the bottom of the chamber and having a multiplicity of generally radially directed air flow apertures, an air supply for the sparger to supply combustion air to the combustion chamber, a plenum chamber disposed in heat contact relation with the housing to receive heat generated in the combustion chamber, an air inlet to the plenum chamber and air outlet from the plenum chamber to the space to be heated, an exhaust stack communicating with the combustion chamber, a stack plenum chamber surrounding a portion of the exhaust stack to receive heat from the combustion gases passing therethrough and having an air inlet and a heated air outlet from the exhaust stack plenum chamber and further including first control device to initiate operation of the combustion air supply w

Abstract: A furnace for firing with optional fuels and where the substantial heat transfer takes place from air to air, whereby the furnace (1) is provided with double shells, which in the space therebetween present partition members (10) which subdivide the space in at least two zones (2,3) through which air is forced by at least one blower (6) from an inlet at one end of the furnace, via a first one of said zones and thereupon via the second one of said zones to an outlet (5) at the same one end of the furnace, whereby the air is brought carefully to flow around the combustion chamber shell.