Originally Posted by jagans
Why not just put another hole in the roof. It will be more Holy. Its a church after all.
Agree with Eplumber.
Upsizing the vent from the fixture being served eliminates the ruling on length.
That said, you CAN upsize the line at the end of it's maximum distance, but doing so will limit the second run of piping.
For example, if you run 1-1/2" vent to it's max distance, upsize to 2" pipe, you are then limited to the maximum lengths of a 2" vent. If your fixture requires a 1-1/2" vent, and you run 2" from the fixture, there are no max distance limits.