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 maximum fixtures on a vent
Author: roundrightfarm (WV)

Do fixture units matter when connecting vents?

I have two 2" vents that I could combine to make a single roof penetration. The two of them together would be venting a total of 24 fixture units. If I split them it will be 10 on one and 14 on the other.

I'm not sure if this is even relevant, but it is in a tall house. Only 1 fixture unit will be venting more than 3 stories distance. About half the other fixtures will vent from 2 stories below, and the other half will vent from one story below.

So my question is- Should I combine these and just make one roof penetration, or should I keep them separate and make 2 roof penetrations?

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 Re: maximum fixtures on a vent
Author: hj (AZ)

One LARGER roof penetration.

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 Re: maximum fixtures on a vent
Author: roundrightfarm (WV)

combine them into a 3"?

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 Re: maximum fixtures on a vent
Author: steve (CA)

Under the Uniform Plumbing Code, a 2" vent can handle 24 fixture units and be 120'long. Do you have snow closure issues for vents at your location?

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 Re: maximum fixtures on a vent
Author: packy (MA)

even if you were over by a few DFU's, it is a single family house so what is the big deal?? you are NEVER going to have them all draining at the same time..

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