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Apparent Backdraft

Posted by The Insulator on November 20th, 2000 11:58 AM
In reply to Cold air coming down chimney by Jeff H on November 18th, 2000 11:35 AM [Go to top of thread]

Air being sucked down the chimney may be a sign of air being sucked out in another area. Probably the first thing to check is your air management system (Heating & A/C). If the system is out of balence, it could be creating a negative pressure by the fireplace, thus creating a downdraft. If there is sufficient air leakage out of your thermal envelope, this could also be creating such a downdraft. If there is insufficient allowance for make-up air for all exhaust appliances (Bath & kitchen fans; dryer; furnace & waterheater drawing it's combustion air from the house), the same situation can exist.

Be mindful of any other barametric venting appliances (waterheater; furnace). If a backdraft can be created in one place, it can happen in another.

The Insulator

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