![]() ![]() The door opens or closes to let extra air into the flue to assure that the draft in the flue remains constant at the proper setting needed for proper heating system operation. The key difference between a barometric draft control or flue damper and an automatic flue damper is that the barometric damper operates by barometric pressure or natural draft while an automatic flue damper is operated by an electric motor. ![]() When the heating system has turned off at the end of an "on" cycle of burning fuel, the automatic flue damper electric (see sketch above and photo at left) motor turns a baffle inside of the flue vent connector pipe to a position "across" the pipe so that the airflow inside the pipe is blocked or stopped.ĭon't confuse an automatic flue vent damper with other "damper" devices: a heating system automatic duct damper or a duct fire damper or a heating zone damper.ĭefinition of Barometric Draft Control (also called Flue Damper) and they workĪ barometric draft control, also called a "damper" or barometric damper, is a hinged, weighted door on an opening at a heating flue. See DIRECT VENTS / SIDE WALL VENTS Definition of automatic flue damperĪn automatic flue damper is a device (shown below) that closes the heating flue when the furnace or boiler is "off" so that we won't continue to lose building heat up the chimney - it's a device to reduce heating costs and save on heating oil consumption. These vents don't use a barometric damper for draft regulation.
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