Re: Stack Vent Requirements


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Posted by Vic PlumbingSupply.com on December 12, 1997 at 13:13:15:

In Reply to: Stack Vent Requirements posted by Jodi on December 12, 1997 at 08:33:53:

All that you need do is multiply the areas of the vents together and the TOTAL area needs to be at least as large as your main drain going to the sewer.

To make life easier don't even us the pie r square method. Simply ignore it as when you multiply it you also divide by it.

Example is a that 4 ea of 2" would equal a 4" line.

Check this: 4ea times 2 x 2=16 and 4 x 4=16. You could also do the 3.14 times the radius, etc etc and that works also.

IF you have a 4" line then a 3" vent (9) plus two 2" (8)=17 and that is larger than 16 so that work work.

If you didn't catch or understand my shortened method it means I failed to explain in this short message and so feel free to e-mail me and I'll go over it again.

Happy holidays and happy plumbing,

Vic



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