how much horizontal pipe allowed? | Forums Home
WEBJan 28, 2014 · I have a 6' horizontal run under the stairs and then a 6' vertical on the outside above the clean out tee. I went with 4" Pellet Vent Pro, which has o ring gaskets and do not need to be siliconed at each joint. The vertical rise will help create a draft in the event of a power failure.