Air admittance valve in wall.


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Old 07-12-16, 08:32 PM
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Air admittance valve in wall.

Hi.
I have a project requiring washer outlet box installation. However, bringing vent pipe over to it is a big hassle (plaster ceiling + cast iron stack ).

Easiest way out will be installing a air admittance valve, but I would need to put in in the wall since I will be using washer outlet box instead of standpipe. I know there are special air admittance valve set with a recessed box and louvered cover, but my local hardware or plumbing supply store don't stock them.
Can I just install air admittance valve in the wall with return air grill on the wall?
 
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Old 07-13-16, 08:22 AM
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Yes, you can install the AAV in just about anything. It just has to be accessible for servicing. So, you can cover it with a panel screwed in place, install a cabinet door over it or just leave it open. The key is that you cannot permanently cover it (don't sheet rock over it).
 
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Old 07-13-16, 04:54 PM
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Thanks.

you can cover it with a panel screwed in place, install a cabinet door over it
But, doesn't it need to be open to air for it to work?
 
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Old 07-13-16, 05:01 PM
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But, doesn't it need to be open to air for it to work?
Most wall spaces aren't air tight.
 
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Old 07-13-16, 07:16 PM
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I do mostly finish plumbing and am not a venting expert. I have used the AAV's though.

I would recommend you check locally to see if they are allowed in the wall. I have never seen one in the wall in California and would be hesitant to install one in a wall.

There are also restrictions on how high the AAV must be or is allowed to be above the trap arm.

That said I trust them, they work good. They are designed for a single fixture only, which is what you have.
 
 

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