I have a Carrier 8000 mid efficiency gas furnace and it is working fine, replaced the blower motor couple of months ago and I would like to keep it for a now. The problem I have, it burns the oxygen from the basement for combustion and the basement is a living space. Because of this I have to open basement windows every day which results in heat loss.
I want to modify it to bring air from outside for combustion, similar with the high efficiency ones. The idea is simple, bring a PVC pipe from outside into the furnace and cover the openings in the front panel (grille) so the air is drown from outside instead of the basement. Would that be a violation of any safety rules? The furnace is 7 years old, no longer under warranty.
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