DIYbanter - View Single Post

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wrote:
Positive. The gas furnace return vents are in the floor of the hallway and
the basement main room.

I know it sounds weird, but I mapped it today and they do not go anywhere.

try causing some smoke around the vents with the furnace on and see if
air moves

And if they do go nowhere, I'd still make sure they were blocked off in
the winter. Leaving them open will still lose a good deal of heat,
especially if they are uninsulated, which I suspect they are.