In-House Vent??

My cousin just bought a house and wants to do some remodeling.. They want to move the bathroom vanity from one wall to the other. In doing so, I can eliminate about 6 feet of supply pipe.. I can also eliminate about 6 feet of drain pipe along with a lot of joints if I can use an "in-house" vent..

This is my question:

Are the in-house vents any good and can they be trusted??

I have never heard of them, but my uncle (their dad) suggested the vent to me.. I would show a picture but I'm not driving 45 minutes for that. Sorry

Any ideas or comments would be greatly appreciated!!

Thanks in advance!

It is called an AAV...air admittance valve. They are not popular among many plumbers, because they are not foolproof, and cannot be expected to last the life of the house. They have been widely used. They are allowed by code SOMETIMES, and some areas prohibit, so that is your first question.

A proper AAV cost more then $20

10 feet of ABS pipe and a few fittings will be less then that.
Pipe doesn't fail.

Just a thought.

Aav

When everything is working properly an AAV will work to the extent that you do not even know it is there. BUT when certain common conditions occur the AAV can have serious problems such as the sink not draining, even though ITS drain is not plugged. When that happens you might spend time trying to unplug its drain and not know about the condition which is actually causing the problem.

Hey Thanks for the comments.. I've never put one in before and didn't know if they're any good or not.. This helps.. Thanks!

Still Corious

So after reading some other posts, I read that the AAV's shouldn't be used in a toilet application..

In my application, I will be using an AAV to vent a kitchen sink, bathroom sink, vanity, and a shower...

Is this too much for an AAV?

SoInBoy said:

So after reading some other posts, I read that the AAV's shouldn't be used in a toilet application..

In my application, I will be using an AAV to vent a kitchen sink, bathroom sink, vanity, and a shower...

Is this too much for an AAV?

Click to expand...

Its unlikely that anyone will be using any 2 of those fixtures at the same time ,The likelyhood of anything bad happening are minimal, BUT, if any one of those fixtures is went venting the existing toilet, then you can add the toilet to your list (which means you will be venting kitchen sink, bathroom sink, vanity, and a shower... AND A TOILET

With all the fixtures on your list, I would strongly suggest the fullproof way, that way you will not give an oppurtunity for MUrphy's law to take affect. Do yourselves a favour and run the extra vent pipe ( You will all be able to sleep at night without any regrets)

You can not use AAVs for the whole house venting. You must have a vent to the outside somewhere in the system. Because they are mechanical and subject to failure, they must be accessible for replacement. They can not be buried in walls. I would suggest you use they only if an outside vent would be very difficult to install, and of course only if permitted by local code.

Aight.. Thanks for the help!