Gas pipe vent sizing...

Started by cedarglen, July 15, 2008, 10:42:32 PM

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cedarglen

July 15, 2008, 10:42:32 PM
I want to merge my 3" water heater vent and my 4" furnace vent together with a Y before exiting through the roof. What size pipe should the output side of the Y be? 5"???

Thank you,
Chuck

glenn kangiser

#1
July 16, 2008, 12:01:47 AM
That works out to about the same cross sectional area.  I don't know if there are any other things to worry about there or not.
"Always work from the general to the specific." J. Raabe

Glenn's Underground Cabin  http://countryplans.com/smf/index.php?topic=151.0

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glenn kangiser

#2
July 16, 2008, 12:06:37 AM
Looks like there may be issues if either are powered.  I read on one posting that if one was power assisted that it was not legal.
"Always work from the general to the specific." J. Raabe

Glenn's Underground Cabin  http://countryplans.com/smf/index.php?topic=151.0

Please put your area in your sig line so we can assist with location specific answers.

ScottA

#3
July 16, 2008, 07:16:45 AM
Bad idea, don't tie them together. The furnace will have a blower on it and can't legaly be tied to another vent. Most places no longer allow vents to be combined at all. Problem is the blower can force the fumes out of the draft diverter on the water heater back into the room.
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