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Old 01-16-2009, 12:41 PM   #16
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Venting


Dumb question here... Any reason the OP couldn't just vent the kitchen sink out the sidewall by the sink? (Might be aesthetic reasons, I'm looking for a plumbing one) Must the vent go vertically through the roof? I don't see why.

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Old 01-16-2009, 01:38 PM   #17
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The vent is on the drain side of the trap so it would let out any/all sewer gases which i don't think anyone would want to walk by their house and smell sewer gases or open the window and have the house smell like a sewer.
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Old 01-16-2009, 03:10 PM   #18
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Originally Posted by Nestor_Kelebay View Post
Your drawing shows a 22 1/2 degree elbow on a 1 1/2 inch drain line.

I understand that you might need a 45 to get the vent vertical. My point is that I've never seen a 22 1/2 degree elbow in the smaller plastic pipe sizes like 1 1/2 inch. Do they exist?
Look again Nestor, it takes a 180 degrees to reverse direction. There's one 90 at the the top, so the other two must be 45's!
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Old 01-16-2009, 03:16 PM   #19
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Thanks for all the help guys. I think i understand most of it now. I made a little drawing(I'm definitely not an artist!) of a two story house with a toilet on each level by the main stack. Then the kitchen sink on the other side. When i vent the kitchen sink can i tie into the main stack in between the 1st floor and 2nd floor or is this considered wet venting and not good? Should i just run the sink vent up to the attic and tie into the main stack above all the drains? Also if i have a sink in the 1st floor bathroom how would i vent that? Can i tie it into the main stack on the 1st floor or would this also be wet venting? Or do i have to run this all the way up to the attic and tie into the main stack above the drains for the 2nd floor fixtures? Thanks again for your knowledge
A vent should not connect to the main stack, where excrement passes by! Some will find its way into the vent and eventually the vent will plug!
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Old 01-16-2009, 04:15 PM   #20
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Thanks wildie..Is that considered wet venting? So my best option would be to run the vent to the attic and then tie into the main stack or use a mechanical vent?
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Old 01-16-2009, 04:40 PM   #21
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Thanks wildie..Is that considered wet venting? So my best option would be to run the vent to the attic and then tie into the main stack or use a mechanical vent?
Yes! annnd Yes! I have used mechanical venting, and they work well also!
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Old 01-16-2009, 05:56 PM   #22
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Thanks everyone. Think i have a good grasp on this venting stuff!
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Old 03-02-2012, 01:38 PM   #23
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I realize that this post is well beyond the time in which to help anyone who was involved with it previously....but felt the need to join the forum to post a few things that may help future readers.

I was simply doing a search to re-familiarize myself with some plumbing codes and when I saw the answers here I could not just let well meaning but definitely somewhat misleading information be stated without at least making sure that more research would have to done before applying anything learned here. As one user pointed out the first thing to do is check out your local codes on plumbing!!! These vary so much from city to city and especially from state to state. I am from Wisconsin and most larger municipalities follow the UDC (Uniform Dwelling Code) which is pretty strict in its guidelines. Many other state's codes would not pass here....in fact most plumbers from other states cannot plumb here without getting recertified!

What I have seen posted may be adequate for some places but virtually everything I have read here would NOT satisfy the UDC code!!

For one thing the mechanical vents are no longer allowed....at all! (recent code change...unsure of if this thread was before it happened).
And the diagrams/images shown with the mechanical vent below the sink's bottom would not pass inspection even when they were allowed (has to be above).

Everything must be vented!

Vents must always be either level or be slanted upward....and be a minimum of 30 inches above the floor height before changing from vertical.

Wet venting, although allowed, needs special consideration...limits on how many per size of drain and also the drain size from each fixture usually have to be increased (for instance a sink drain would have to be 2 inches instead of the standard 1.5 inch). A 3 inch drain can only accommodate just so many fixtures (fixture types are figured as well when determining this).

Again....I just want to make sure that people are not taking what has been stated here in this thread as gospel....that it is a must to find out from your local codes what is required.

Last edited by Mike_C; 03-02-2012 at 01:47 PM.
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Old 03-03-2012, 07:06 AM   #24
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darn right, studer vents are great, never had a probrlem with drainage, and compare the cost and time it will take to run the vent and i bet you'll go with a mechanical vent
I agree. But I have lived in ten different states in the USA, and AAVs were illegal in most of them. The IRC allows them but the UPC does not.
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Old 03-03-2012, 07:19 AM   #25
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yes and so do 60's
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Old 02-21-2013, 08:33 PM   #26
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Can having an oversize vent effect the way a low flow toilet flushes? One story condo built in 1955 in North Carolina. If this is the case can I try closing off half or a third or the vent on the roof to see if it makes the toilets flush better.

I replaced two toilets that are back to back but they never flushed right. The association said it was problem with my toilets I bought but how can two toilets be bad at the same time,,,, I think it might be the venting.
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Last edited by peterbrooks; 02-21-2013 at 08:35 PM. Reason: better explain and correct spelling mistake
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Old 02-21-2013, 08:46 PM   #27
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No ,, vents are for pressure Equilibrium in the system.
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Old 02-21-2013, 09:05 PM   #28
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I thought they were for venting gasses.
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Old 02-21-2013, 09:13 PM   #29
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I thought they were for venting gasses.
secondary purpose, third purpose access in to a line. etc,
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Old 02-21-2013, 09:24 PM   #30
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Somewhere in the thread above there was a hint to an astm specification for venting but I could not fully understand what they wrote, sounded like 3" was too big.

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