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Fri, Sep 24, 10 at 12:48
| Hello,
I have a Gas furnace and a Gas water heater that each have a 4" flue pipe from them. These two are then connected into a single 8" pipe that goes up through my chimney. I was told that 8" is too large and it has probably been there for years and no one bothered chnaging it when they installed the new furnace.
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Follow-Up Postings:
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| Look in the flue sizing tables in the gas code. Depends on your total BTU output. |
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| And since your furnace is 4" it sounds like a fan assist so you should be looking at the NAT + Fan total BTU chart with correct vent connector length and chimney height. Heres a link why there needed and sizing charts, assuming its gas appliances http://www.mtlfab.com/media/L1238.pdf |
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