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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).

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16y ago
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Q: What is the requirement for bathroom with no windows?
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