I would suggest that you simply increase the size of the vent to 2.5" if you can find it. If not, 3" pipe on the horizontal will work just fine as well. Be sure to pitch the vent at about 1/4" to the foot back toward the drain.

Finally, you could combine the vents and use a 2" AAV... if they are allowed in your area! The AAV must be "readily accessible" for change out in the future should the AAV fail.

Mark

Are you better off going with a regular vent? Should AAVs be avoided if possible? This horizontal vent pipe will be installed in a 2x4 wall so the smaller the pipe the better. Will a 2.5" pipe fit in a 2x4 OK?

I suppose I could go straight up and put in another vent through the roof for these fixtures only. I am going to be opening up the wall on the first floor for a window anyway.

Regular vents are always best... no mechanical parts to fail!

If you can even find 2.5" pipe/fittings then a 2.5" pipe would just barely fit inside a 2"x4" wall and wouldn't leave much wood behind.

Most likely you'll need to pipe this up 3" and in that case fir the studs out 1.5" using 1.5" studs or maybe that vent straight up and through the roof will put this all to rest for you... :)

Back to you...


Mark

Going the route of a regular vent through the roof. Should I use 2" PVC for the whole vent, including through the roof?

2" all the way and through the roof 18"-24" if you have snowy winters or 6"-12" through the roof if you are from sunny areas like Florida or California... ;)

Mark

Quote:

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I was thinking of putting the PVC under the footing in a cast iron/steel sleeve, what do you think about this? I can't see how this method could be rejected because its seems like a good solution, at least to me.

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NOT NECESSARY!
Most of the big box guys aren't plumbers. Yours was assuming you were going THROUGH the foundation. But you're not are you? You're going UNDER it.
Run PVC all the way with no cast iron sleeve. Good luck, Tom

When I run the 2" vent pipe, is it OK to use the short radius 90s? Is there a limit to how many 90s I can use when installing the vent pipe?

There are a few tight 90s I need to install to get it up the wall.

Use 2" regular 90s where needed.

In terms of limiting the number of elbows you are definitely looking to use the fewest elbows possible.

If needed, they also sell short pattern vent 90s... ;)

Mark

Here is a quick and dirty sketch of what I am intending on doing... does this look good or would you vent it differently?

The arrow indicates where it will penetrate the floor and go into the 1st floor wall. The pipe in the wall can be arranged any way.

Here's how I'd do it... ;)

As always, pitch the vent as previously mentioned and connect the horizontal vents together at 42-48" off finish floor.

Mark