View Full Version : How long can toilet vent be?

07-26-2012, 02:08 PM
I need to vent my toilet drain pipe. I would like to run it out the side of my house, which is about a 30ft run. Would that work?

07-26-2012, 02:25 PM
As long as it doesn't run horizontal below the flood rim of the fixture.


07-26-2012, 02:28 PM
AFTER you run it out the side of the house, you still have to run it up the side of the building to the roof line or above it.

07-29-2012, 11:36 AM
I was going to run it horizontal below the toilet. Since that is out of the question, I'll have to go through the wall. What is the maximum angle I can have on it before it gets above the flood rim? Can I put 45s on it?

07-30-2012, 01:20 PM
Anyone? There is already a 3" pipe running vertically off the drain pipe, but it's a few feet from the wall. If I'm going to go through the wall, I'm going to have to go diagonally first. Can I run a 45 off that pipe, then another 45 to get it back to vertical?