Adjustable heat recovery system for flue stacks
Air filtering system and method of operation
Apparatus for increasing the efficiency of heating systems for b
Apparatus for recirculating heated air
Automatic fireplace heating system
Automatic fireplace heating system
Auxiliary air heater for fireplaces
Auxiliary heating equipment
Building heating system
Chimney heat capturing system
Chimney heat economizer
Chimney heat reclaimer
Chimney waste heat collector requiring no building renovation
Circulating air building heating system
Circulating fireplace with adjustable controls for selectively h
Combination weathervane heat exchanger
Combined heat-exchanger and supplemental air circulator for hot-
Control unit for make-up and combustion air circulation
Control unit with separate dampers for make-up and combustion ai
Convection lock-vent