Low speed interlock for a two stage two speed furnace

Method and apparatus for controlling a liquid fuel space heater

Method for providing variable output gas-fired furnace with a co

Method of operating a natural gas furnace with propane

Modulating furnace having a low stage with an improved fuel...

Modulating furnace with two-speed draft inducer

Modulating gas valve furnace control method

Multistage warm air furnace with single stage thermostat and...

Oil stove

Pilot pressure switch and method for controlling the operation o

Pressure sensing device in gas furnace and method for...

Restricted intake compensation method for a two stage furnace

Safeguard for furnace draft system

Safeguard for furnace draft system

Safety circuit for furnace

Space heater

Space heater

System for reclaiming heat in a furnace arrangement

Thermal energy storage to increase furnace efficiency

Tube arrangement for heat exchanger