Why is a 2" line needed for a WC vent? I thought it could be 1/2 of the dia. of the drain line being vented.
So if a WC is on a 3" line, wouldn't the vent only be 1-1/2"?
Note: IPC code in my area.
So if a WC is on a 3" line, wouldn't the vent only be 1-1/2"?
Note: IPC code in my area.