Dealing with a bathroom that has a tall chimney-like skylight that goes up about 15 feet above the ceiling of the bathroom. The problem is that moisture gets past the bathroom exhaust fan and collects up by the skylight. As a result the paint and drywall texture are peeling near the skylight. A drywall contractor friend of mine suggested putting a separate exhaust fan up there. I’m looking at having a separate exhaust fan up there with built in moisture sensing. But can you have a second fan by code? Would they have to be vented separately? Any ideas? —Thx!
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There's nothing in the International Residential code that I'm aware of that limits the number of fans in a bathroom. The code does say it must vent to the outside, and not recirculate, so if you combine the 2 fans to one duct you need to make sure one does not push air back through the other fan. Also, if you run a duct through a space that can be cold it's best no to run the duct uphill or the moist air that condenses in the duct will run back into, and out of, the fan.