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Old 07-19-2012, 10:02 AM   #1
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Pros and cons of AAVs


I am in the process of installing a 1/2 bath. I need to install a vent but don't want to go through the roof. Are there any down sides to using an AAV or would a loop vent be best?

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Old 07-19-2012, 10:49 AM   #2
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Pros and cons of AAVs


I have 3 of them. The only downside I can see is they ARE mechanical, and as such could wear out over time. If I have to replace them every 20 years or so though, that's a fair price to pay for not having to run vents, as long as they're approved in your area. I added only the tiniest drop of glue so when they need to be replaced, they should come off relatively easily. They passed the inspection just fine that way.

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Old 07-19-2012, 12:12 PM   #3
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Pros and cons of AAVs


Are asking about an island loop vent? They are labor intensive and take up a lot of room when you stack the fittings. They also require a foot vent through the roof. At least the ones I'm familiar with.
Can you pull a normal vent back to your existing vent stack in the attic?
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Last edited by TheEplumber; 07-19-2012 at 12:14 PM. Reason: added question
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Old 07-19-2012, 01:46 PM   #4
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Pros and cons of AAVs


There is a vent about a foot from the sink but it is a heavy galvanized pipe that is screwed into a PVC pipe which only sticks through the floor about 5 inches or so. There is a stud within 2 or 3 inches on either side of the pipe and it would sure be hard to cut that pipe unless you think a sawzall would cut it.

I was asking about a loop vent like is used in an island sink. I installed one in a house I had several years ago and it wasn't tied into an outside vent and it worked good, I didn't know they had to be tied into a vent that went through the roof.

How far from the main vent can I be to tie into the main vent?

DM, that is a good idea about a drop of glue so it could be taken back off.
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