Any length max on horiz. vent branch (to get to main stack)?
First, is there an exact name for the horizontal piece that multiple secondary vent stacks terminate in, that then runs over to the main vent stack?
As depicted in the bottom, rightmost picture titled "Terminating into header" on this page:
Is it called a "vent header"?
(Asking because when I Google search on "vent header", I get pages that don't match in their descriptions. :-)
And my main question: Does the code put a restriction on how long that horizontal piece can be?
If I have a secondary stack vent running up to the attic, can I terminate it in a horizontal piece that might run 25 feet over to the main stack?
Or would I have to split up that horizontal distance with another stack vent in some way?
If it makes a difference, I'm in MA and I think we're under the UPC. I'm trying to learn enough that I have the right terminology to even see what might be feasible to do in my old house.
Thanks in advance!