07-18-2007, 07:05 AM
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Deity
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Join Date: Jul 2004
Location: Saint Regis Falls, NY, USA.
Posts: 3,837
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the air conditioner is creating a negative pressure in the ducting system in the house to circulate conditioned air. its pushing the colder air into the house and "sucking" the heat laden air into the a/c system. any air leaks in the house will be in this "convected" air of which the chimney is a direct source to outside air. any odors within the chimney are picked up and re-circulated in this air loop. other than the stink I wouldn't worry about any "gases" that are harmful. there's no combustion in the fireplace.
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