My bathrooms each have a loud exhaust fan in the ceiling. I plan to replace these with very quiet ones. The residential building codes all require that these be ventilated to the outside, either through the wall or the roof. Ideally, that vent is solid metal going straight up from the fan, not plastic hose or corrugated metal pipe. However, when I look at my roof, I don’t see any openings for these vent pipes. I see the attic ventilators near the peak of the roof, and a dryer vent, and the small air vents required for the plumbing. That’s all.
Do you know where the air goes from these bathroom fans? Blowing this air into attics has been against the building code for decades. It’s a great way to soak the plywood above the vent, leading to rot.
Bathroom Vent Fan Codes, Installation, Inspection, Repairs