sewer vent size??

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sewer vent size??

Postby jahyde » Fri Feb 05, 2016 11:56 am

So I know in general home construction 1.5" vents are mandated for a 3" drain.... But trying to keep vent sizes slim in my trailer, how many people have used 1 1/4 on the black tank?
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Re: sewer vent size??

Postby Redneck Teepee » Fri Feb 05, 2016 3:25 pm

Your not getting it inspected so use what will fit in your space and call it good. 1-1/4" is plenty big :thumbsup:
Not sure what the I.D. of your wall or chase is but a 1-1/2" ABS/PVC vent pipe will measure 1-7/8" +/- O.D....1-1/4 will be 1-5/8" +/- O.D.
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Re: sewer vent size??

Postby MtnDon » Fri Feb 05, 2016 4:11 pm

I used a 1" line from holding tank up to the roof vent where I adapted up to whatever size the RV roof vent needed. The tank fills and drains fine.
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Re: sewer vent size??

Postby satch » Fri Feb 05, 2016 5:40 pm

Redneck Teepee wrote:Your not getting it inspected so use what will fit in your space and call it good. 1-1/4" is plenty big :thumbsup:
Not sure what the I.D. of your wall or chase is but a 1-1/2" ABS/PVC vent pipe will measure 1-7/8" +/- O.D....1-1/4 will be 1-5/8" +/- O.D.

Agreed, The vent pipe is meant to equalize the pressure of flow, so using a smaller vent just means draining might take a little longer. No big deal.
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Re: sewer vent size??

Postby jahyde » Sat Feb 06, 2016 3:05 am

thanks... that makes me feel a bit better, I have worked a lot in home construction, and some associates even said "has to be 1.5", but I had a feeling it would breath just as well on 1".
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Re: sewer vent size??

Postby Dale M. » Sat Feb 06, 2016 11:18 am

Its just air and if there is very little resistance to flow, might get away with as little as 1/2 id tubing/pipe...

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Re: sewer vent size??

Postby Pleiades » Sat Feb 06, 2016 8:28 pm

Plumber here. . I have witnessed 3/8 inch copper line give enough air to flush a house toilet. So 1inch or probably be sufficient
Better to bring it and not need it...that whole thing.
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