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Also called the flow reversal, the backdrafting is the reverse flow of the outdoor air into a building trough the barometric damper, draft hood or burner unit as result of chimney blockage or a pressure diifferential greater than can be drawn by the chimney. Backdrafting causes smell, smoke or toxic gases to escape into the interior of building. Cold backdrafting occurs when the chimney is acting as an air inlet but there is no burner operation. Hot backdrafting occurs when the hot flue gas products are prevented from exhausting by flue reversal.

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