I have a propane furnace that sits in my attached garage. I have a crawl space under the house and this is where the duct work is located. My return duct work is in the attic. In the winter when the furnace is not running I feel cold air coming through the vents. I have looked for a leak in the duct work but have not found any. Any ideas where the air is coming from or ideas for checking the duct work? Thanks.
By KC from KY
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