What is the requirement for bathroom with no windows?

Building codes vary by location, but generally require a bathroom to have ventilation. The ventilation is to remove moist air, which can damage the building structure over time as well as to remove odors. For a bathroom with no windows, this requirement is usually met with a ventilation fan. The fan should vent directly to the outdoors (not just into the attic - this can ruin your roof).

First answer by ID415165653. Last edit by ID415165653. Question popularity: 7 [recommend question]