Adjustable sleeve damper assembly for a coal-fired furnace

Apparatus for discharging exhaust gas at high velocity

Auxiliary exhaust system

Barometric draft regulator

Blower for generating static pressure

Blower housing with maximized interior spacing

Blower housing with maximized interior spacing

Common vent device for positive vent pressure and draft hood equ

Curved blade by-pass damper with flow control

Flue restrictor

Furnace blower housing with integrally formed exhaust...

Furnace damper and support

High temperature damper

In-line power venter

Induced draft fan control for use with gas furnaces

Induced draft fan control for use with gas furnaces

Induced stack draft apparatus

Method and apparatus for controlling gas flow

Method and apparatus for powered flue products exhaust and prehe

Method for controlling an induced draft fan for use with gas fur