# When are Air Admittance Valves (AAVs) acceptable substitutes for vent stacks under local adoptions of IPC/UPC/CEC, and …

**URL:** <https://home.renovation.reviews/t/when-are-air-admittance-valves-aavs-acceptable-substitutes-for-vent-stacks-under-local-adoptions-of-ipc-upc-cec-and/20090>\
**Category:** Trade Talk\
**Created:** [August 4, 2025, 3:43pm UTC](https://home.renovation.reviews/t/when-are-air-admittance-valves-aavs-acceptable-substitutes-for-vent-stacks-under-local-adoptions-of-ipc-upc-cec-and/20090 "2025-08-04T15:43:14Z")\
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**Author:** ![reno\_questions](https://home.renovation.reviews/user_avatar/home.renovation.reviews/reno_questions/32/2758_2.png) [@reno\_questions](https://home.renovation.reviews/u/reno_questions)\
**Post date:** [August 4, 2025, 3:43pm UTC](https://home.renovation.reviews/t/when-are-air-admittance-valves-aavs-acceptable-substitutes-for-vent-stacks-under-local-adoptions-of-ipc-upc-cec-and/20090/1 "2025-08-04T15:43:14Z")

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When are Air Admittance Valves (AAVs) acceptable substitutes for vent stacks under local adoptions of IPC/UPC/CEC, and what failure modes inspectors flag most?

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**Author:** ![Tim\_Michael1](https://home.renovation.reviews/user_avatar/home.renovation.reviews/tim_michael1/32/6294_2.png) [@Tim\_Michael1](https://home.renovation.reviews/u/Tim_Michael1)\
**Post date:** [August 7, 2025, 11:48am UTC](https://home.renovation.reviews/t/when-are-air-admittance-valves-aavs-acceptable-substitutes-for-vent-stacks-under-local-adoptions-of-ipc-upc-cec-and/20090/2 "2025-08-07T11:48:17Z")

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Okay, so AAVs are pretty handy, especially when you’re fixing up a place or dealing with tricky spots where it’s tough to vent things the usual way. Just remember these things:

Make sure you’re following all the rules,

Only use parts that are okayed for the job, and

Get them installed the right way.

It’s always a good call to check with your local inspector first because what’s okay can be different depending on where you live.

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**Author:** ![Lexi\_Carter1](https://home.renovation.reviews/user_avatar/home.renovation.reviews/lexi_carter1/32/2767_2.png) [@Lexi\_Carter1](https://home.renovation.reviews/u/Lexi_Carter1)\
**Post date:** [August 10, 2025, 11:54pm UTC](https://home.renovation.reviews/t/when-are-air-admittance-valves-aavs-acceptable-substitutes-for-vent-stacks-under-local-adoptions-of-ipc-upc-cec-and/20090/3 "2025-08-10T23:54:08Z")

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AAVs are allowed under most IPC and some UPC/CEC rules when vent stacks aren’t practical, like in remodels or island sinks.

Inspectors mainly flag them for poor placement, inaccessibility, or wear that risks sewer gas leaks.