All winter long, a furnace heats and circulates air. A properly maintained filter will prevent most particulate matter from getting inside the machine. However, some very micro-sized stuff and fumes can get in. My home has a cigarette smoker and a cigar smoker. Twice a year (fall and spring), I ope...By: vicvelcro
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Source: http://www.instructables.com/id/Furnace-cleaning-quick-and-easy/
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