Vent Question

What is the maximum distance a vent can run horizontally from the main vent stack. I have a kitchen sink vent and a washer stand pipe that are both about 25 feet away from the main vent stack. I'm trying to avoid drilling another hole in the roof.
Thanks

It needs to have a slope to it in case any moisture gets in there - condensation or rainwater from the part sticking out of the roof. If you can provide that slope, I think you should be okay.

As long as the take off is correct, and the tie in is at the proper minimum level, then you are ok, but you must provide slope back towards the drain as already mentioned.