3 inch single to 4 inch B pipe?
#1
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3 inch single to 4 inch B pipe?
I have a floor gas heater in my garage. 3" vent. I am wondering if I can convert to 4" vent anywhere along the venting? For example. Can I run the 3" single pipe then put on an increaser (3" single to 4" single) and attach the increaser to a 4" B vent?
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#2
Yes, as long as your local code allows it. The only concern with increasing vent size is the condensation of flue gasses in the larger diameter flue. a 3 to 4 inch increase should not be a problem.