I am in the middle of a remodel in seattle and have a six 6 diameter exhaust vent for my furnace that currently runs up through the roof. My question is can I re-route the vent through the floor to vent out the side of the house instead of through the roof?
You could do this, if you absolutely must, but you would need a double wall galvanised vent pipe and an exterior power venter. Unless you positively, absolutely, must go this direction, I would avoid it as the external power venters are expensive and unreliable.
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