Posted by brian on June 05, 2001 at 12:10:30:
I am having my boiler moved to the other side of the room. I am also installing a new class B chimney for the boiler (Boiler built by National some 30 years ago).
The question is: What size vent does it need? 5 or 6 inch? There are no other utilities being attached to the chimney. The unit has a five inch vent coming off of it.
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