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Old 04-02-2013, 09:23 PM   #1
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Toilet Venting


Is it ok to vent a toilet as in the attached image? Specifically, can I use a san-t here? Or do I need to use a wye or combo?
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Old 04-03-2013, 05:54 AM   #2
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Toilet Venting


3rd photo top row. Wye--stub--45

Photo is from Bert Polks plumbing handout Lincoln County.

Im curious also to see if your photo would be OK or if that would be considered a flat vent. Do you have an issue with height before you get to a wall for venting is that why you want to vent vertically first
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Last edited by hammerlane; 04-03-2013 at 06:04 AM.
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Old 04-03-2013, 08:56 AM   #3
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Toilet Venting


Ok, I can do that too (use wye). I had seen a similar image to that as well. I was just curious if the san-t was ok, in my situation it was less fittings and takes up less vertical space.

I need to actually rotate that 90 to point at the stack and I was going to run the vent in the wall behind the toilet. There is a vent there that I can tap into. I've got plenty of vertical space below though, this is a first floor bathroom, so lots of room.
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Old 04-03-2013, 10:54 AM   #4
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Toilet Venting


Only if your picking up a lavatory sink with that vent. What you have then is a wet vent. If you are not doing that then it would be illegal per IPC. You are not allowed a dry flat vent below the fixture it would tend to clog then you will have no vent.
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Old 04-03-2013, 11:54 AM   #5
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Toilet Venting


Got it, that makes sense. I could potentially redirect the lav down that.

If I don't connect the lav though, would the layout attached be considered a dry flat vent as well?
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Old 04-03-2013, 02:08 PM   #6
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Toilet Venting


Put a lav on it it is legal. No Lav it is no longer legal.

The lav acts as a wash out of the vent. It will also stop working if the vent becomes blocked. You will then snake the lav to re open the vent.

IPC code only I cannot speak for other areas of the country.

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