I am putting in a new laundry/bath. It has a shower, sink, toilet, washer. It is right next to my other bath, which has a sink, shower, and toilet. The original bath has a 3" vent in the roof. By code, will I be able to tie in my new laundry/bath to the 3" vent and save a hole in the roof? The farthest fixture is approximately 10' from the current vent. Thanks for your help!