Must bathroom vents terminate at the home's exterior?

Bathroom vents must indeed terminate at the home's exterior to ensure proper ventilation and moisture control. By directing moist air outside, it prevents the accumulation of humidity and potential water damage within the attic or other areas of the home. Termination at the exterior helps to eliminate the risk of mold growth, wood decay, and other issues related to excessive moisture buildup, which can occur if vents simply exhaust into the attic space or other interior areas.

Proper exterior venting is a standard practice that enhances the overall air quality and structural integrity of the home. This practice is applicable regardless of climate, as humidity and moisture are concerns in both humid and dry environments. Therefore, the requirement for bathroom vents to extend externally remains constant to promote healthy airflow and effective moisture management throughout the dwelling.