Flue control device

Flue control device

Flue damper and draft regulator

Flue restrictor

Flue throttle

Fuel economizer

Fuel saving device

Furnace with draft-limiter and ventilation

Fusible link assembly

Guillotine damper

Guillotine dampers with blade sealing means accommodative of the

Heating apparatus

Heating device

Isolating damper for closing a duct

Jacketed combustion type heater with blowback prevention feature

Latch for a butterfly damper

Mechanical draft controller

Mechanical draft controller with vent damper

Method for fuel economy

Motorized insulated damper assembly for furnace systems