Fixer- upper house I bought has a recently installed Nat. gas furnace installed in the attic . The installer seemed to do an okay job with the flue which is 3″ dbl insulated pipe thru roof. But studying the manual I saw wherethe installation calls for 4″ pipe after it leaves the 3″ stem on furnace.
I wonder why they ask you to throttle up to a larger pipe size and not just stub out the finished size at the furnace and how important is it for me to replace the 3″ with 4″?
They also put the return in the hallway cieling and altho its not near any of the cieling registers in the other rooms i wonder how effciently thats going to work.Its only a 1000′ sq. ft house and it heated mostly with wood and few times Ive used furnace seemed to alright job heating house altho im never a big fan of fan forced heat.Boy its noisey compared to a wood stove!
Replies
Good idea to talk directly to the company tech rep on this one. The company that made the unit, not the install company. A wrong guess can be dangerous.
What I do know about exhaust flows makes me curious about this. Qs come to mind.
It is possible that for a short run with atic install, you are fine, but do find out!
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