A bathroom in a dwelling unit must have a minimum intermittent exhaust of how many CFM?

The minimum intermittent exhaust requirement for a bathroom in a dwelling unit is set at 50 cubic feet per minute (CFM). This standard is established to ensure adequate ventilation to remove excess moisture, odors, and harmful indoor air pollutants that can accumulate in enclosed spaces, especially in areas with high humidity like bathrooms.

Proper ventilation is crucial in preventing mold growth and maintaining air quality. An exhaust fan providing 50 CFM is generally recognized as sufficient to effectively ventilate a typical bathroom, which usually features plumbing fixtures that produce steam and moisture.

Higher values, such as 75 CFM or 100 CFM, may be applicable in situations involving larger bathrooms or in specific local building codes, but the standard minimum requirement set by most building codes is 50 CFM. Thus, ensuring that the exhaust system meets or exceeds this standard is essential for both health and safety in residential settings.