From the fan, a single exhaust duct exits through the roof. Each bathroom has its own switch and operates independently.

Some have electric vent fans, and one house has a fan powered ... This from a man whose byline was on “A Crash Course in Roof Ventilation,” a story in Fine Homebuilding magazine in 2011 ...

All six floors have restrooms exhausted by one central rooftop-mounted exhaust fan, interlocked with the building's control system. Other supporting systems include: an elevator machine room ...

Installing a roof vent for proper ventilation of your attic is a relatively straightforward task, but you’ll need to collect the right tools. Below are the items you’ll absolutely need.