Where should a bathroom vent exhaust?

A bathroom vent should exhaust to the exterior of the building. This is important for several reasons. When moisture from showering or bathing is expelled into an attic, interior space, or basement, it can lead to mold growth, structural damage, and poor indoor air quality. Venting to the exterior helps to effectively remove humid air and odors, contributing to a healthier environment within the home.

By venting directly outside, the system prevents excess moisture from accumulating within the walls or in the attic space, where it could cause wood rot or encourage pest infestations. Additionally, allowing steam and odors to escape completely helps to maintain a comfortable atmosphere in the bathroom and throughout the house. Therefore, exhausting the bathroom vent to the exterior is essential for proper ventilation and moisture control in residential spaces.