Venting a walk-in shower question

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David74

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Hi guys, can i use 1.5 inch size diameter pipe to vent 2 inch drain pipe for walk-in shower?
I would use a 2 inch pipe for venting if i could but space is very limited and 1.5 inch would do the trick.
Thank you so much
 
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That's fine, I've done the same when space was a contraint.

Most folks just drop in a AAV, the cross section of a 1.5" DWV is much larger than the cfm that any AAV allows.
 
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