barometric damper

barometric damper

An automatic adjustable device for regulating the draft through a fuel-burning appliance, thereby making operation of the appliance nearly independent of the chimney draft over its normal range of operation.
References in periodicals archive ?
The only way to safely vent one of these gas hot water heaters is to modify the appliance by connecting the chimney to the appliance and incorporating a barometric damper.
A round duct with barometric damper was discussed during construction and is still being tossed around, although the owner is not yet toasted, and 350[degrees], the Schalls would attest, is a gross exaggeration.
Causes of a low percentage of carbon dioxide include too much combustion air being supplied to the burner, a broken damper (or one that is open too wide), too much chimney draft, air leaks into the boiler or furnace, or improper setting of the barometric damper.
Gravity type barometric dampers are also an option.