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Author:
bootlogic100 (IL)
I'm a little unclear on how far a vent can go horizontally. According to Illinois code it says.
e) Size of Vent Piping. The size of vent piping shall be determined based upon its length and the total number of drainage fixture units connected to the vent pipe as provided in Appendix A.Table K. No more than 20 percent of the maximum developed length as determined from Table K may be installed in the horizontal position. Vent piping serving floor drains shall be installed so as to minimize horizontal vent distances.
(ftp://www.ilga.gov/JCAR/AdminCode/077/077008900K15800R.html)
At first I was thrown and thought it could only be 20% of length of vent. But that almost seems impossible as you would have a vent poking out of the roof at drain location in the house and I'm pretty sure that is not how professional plumbers do it. Then I did some googling and I saw where someone said the 20% is based on the max length in Appendix A Table K, not on actual length of vent pipe. That seemed to make more sense.
(ftp://www.ilga.gov/JCAR/AdminCode/077/07700890ZZ9996akR.html)
Everything seemed fine until just now my brother said that a plumber at a large university where he works told him it is the actual vent pipe length as I had at first read the code. This plumber has been around for quite a while and works in a commercial setting (so I would think he would know). Can someone confirm what is actually right? In a 1 story house your vent pipes would approximately 7 ft to attic and then another 7-9 ft out the roof being a total of about 15 ft in developed length. This would allow for maximum 3 ft horizontal vent. Is this right?
Where we live, there is actually no plumbing inspection but I want to do things right. Thanks!
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Author:
packy (MA)
"as determined from Table K may be installed in the horizontal position"..
this says it all...
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Author:
bootlogic100 (IL)
That is what I thought but I needed confirmation from a pro.
Before I posted this, I called my brother and said I really don't know much about plumbing and I probably will look like an @#$%& but I've read the code multiple times and I think the licensed commercial plumber is wrong. The code seems clear. If it was meant for the actual vent pipe length it would say Developed Length not Maximum Developed Length and they wouldn't reference Table K. Thanks
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Author:
chicago plumber (IL)
it depends on how many fixtures units are on the vent to determine vent size and length. if you are venting a bathroom a 2in vent will most likely work. if you are venting a kitchen sink or something similar and have to go a long distance just increase to 2in vent instead of 1 1/12in.
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