draft hood (draft hood)

a device placed in, and made a part of, the vent connector from an appliance or in the appliance itself, which is designed to: (a) assure the ready escape of the products of combustion in the event of backdraft; (b) prevent a back draft from entering the appliance; and c. neutralize the effect of stack action of the chimney or gas vent upon the operation of the appliance.
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