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Thread: toilet vent

  1. #1
    DIY Junior Member 69gtocv's Avatar
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    Default toilet vent

    I think I know the answer to this but I thought I'd ask anyway. Having problems finding a long sweep 90 w/low heel inlet 3x3x2 locally. I'm wanting to use this to transition from horizontal toilet drain to vertical toilet drain and use the low heel part for the toilet vent. There are plenty of the 3x3x2 regular 90's w/low heel inlet but I thought it would be better to find the one with the long sweep to better help with the "logs", right? I'm thinking this is not to code, but what about using a 3x3x2 combo wye with the vent coming off the top of the 2" straight leg of the wye? I'm guessing not because the vent opening in the wye would be starting below the upper most part of the horizontal drain. Also guessing that's why the low heel inlet was invented, to start the vent higher up in the elbow?

    Thanks, Jeff

  2. #2
    DIY Senior Member speede541's Avatar
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    I just used a low heel 90 in my installation, and at the three local suppliers I use, I haven't run into a long sweep. My understanding has been that the sweep is only necessary at a vertical to horizontal transition, to ease the fast fall into a slower-moving slide, but has no benefit or necessity in a horizontal to vertical change in flow.

  3. #3
    In the Trades Wally Hays's Avatar
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    That fitting is basically a sanitary tee. The heel inlet, either high or low can not be used for venting in the horizontal position.
    Perception is 3/4 of reality

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    DIY Junior Member 69gtocv's Avatar
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    Quote Originally Posted by speede541 View Post
    I just used a low heel 90 in my installation, and at the three local suppliers I use, I haven't run into a long sweep. My understanding has been that the sweep is only necessary at a vertical to horizontal transition, to ease the fast fall into a slower-moving slide, but has no benefit or necessity in a horizontal to vertical change in flow.
    Thanks, I will go with the regular sweep with the low heel 90 then. I knew there was the issue with horizontal to vertical or vice versa, I just couldn't remember it at the box store and the employee was of no help

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    DIY Junior Member 69gtocv's Avatar
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    Quote Originally Posted by Wally Hays View Post
    That fitting is basically a sanitary tee. The heel inlet, either high or low can not be used for venting in the horizontal position.
    Wally, I didn't describe what I was trying to do very well, that 90 w/heel will be used in the vertical position, what I was wondering about was if a long sweep 90 could have been used instead of the 90 w/heel, turning it vertical and running the vent off the top part of the straight portion of the long sweep wye. I'm sure it's not ok so I will go with the 90 w/heel.

  6. #6
    Forum Admin, Expert Plumber Terry's Avatar
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    They only make the Santee bend in the lo-heel, which is what is always used for venting.
    It it was a shower or lav, it would have to be a santee bend going from horizontal to vertical.

    As far as the function of the toilet goes, you have a 2" trapway dumping into a 3" pipe. It's gone at that point.
    If the waste can navigate through all the bends in your little trapway, it's free sailing after it hits the 3".

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