Bathroom Vent Installation

[sgregg003]

I recently purchased a 40 year old home, and both bathrooms are vented into the attic. Unfortunately these bathrooms are back to back, with the stack going right up through the middle of them. Both vents will be fed by 4 inch pipe, is there any type of code that states what kind of clearance the bath vents need in relation to other vent that go through the roof? In the attic they are roughly about 3.5 to 4 feet apart from each other, but with the stack in the middle.

Thanks

Scott G.

[Brandon Whitmore]

is there any type of code that states what kind of clearance the bath vents need in relation to other vent that go through the roof?

Not that I am aware of.

In the attic they are roughly about 3.5 to 4 feet apart from each other, but with the stack in the middle.

What could possibly be of concern with venting a bathroom exhaust near a plumbing vent pipe?