Air control system for a burner

Air intake for furnace

Apparatus and method for modulating the firing rate of furnace b

Apparatus for supplying heated air to an air system

Appliance combustion chamber

Arrangement of burner and heat exchanger, and air-heating...

Burner unit

Chambered gas fired convection heater

Coaxial dual primary heat exchanger

Condensate pan with condensate trap

Condensing furnace

Control for heat pipe central furnace

Control methods and apparatus for gas-fired combustors

Controlled labyrinth heat exchanging oil nozzle assembly

Differential pressure modulated gas valve for single stage combu

Direct fired unit heater

Dual fuel heater

Dual fuel heater

Fan control arrangement for a two stage furnace

Far-infrared radiating system