My neighbour has only one pipe sticking out of his house and I have two pipes, what’s up with that?
Your Neighbour’s furnace is using the air within their home for combustion. This is robbing their home of air which has already been heated, used for combustion then exhausted to the outside. Your two pipe system brings cold air from outside for combustion then exhausts it back outside without using any heated air from within the home. Some manufacturers will not honour the lifetime heat exchanger warranty unless a 2 pipe system is used. Often furnace and laundry facilities are located in the same room. In a single pipe system the air being used for combustion is bringing with it fabric softeners and detergents that give off gases that are very corrosive to the internals of the furnace. Insist on a two pipe system where the intake and exhaust are piped to the outside.
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