What is the minimum continuous bathroom ventilation requirement in cubic feet per minute (CFM)?

The minimum continuous bathroom ventilation requirement is 20 cubic feet per minute (CFM), which is established to ensure that bathrooms have adequate ventilation to control moisture and odors effectively. This standard is important because bathrooms are areas that can experience high humidity levels due to activities such as bathing and showering. Proper ventilation helps to prevent mold growth and maintains indoor air quality.

The 20 CFM requirement is designed to provide enough air exchange to dilute and remove airborne contaminants, keeping the space comfortable and safe for occupants. This ventilation rate is aligned with building codes and standards aimed at promoting health and safety in residential buildings. Adequate ventilation also assists in energy efficiency by reducing the likelihood of moisture-related damage in the structure.