Where should dryer exhaust ducts for clothes dryers terminate?

Dryer exhaust ducts for clothes dryers should terminate outside the building. This is crucial for safety and efficiency. When dryer vents exhaust air outside, it allows the moisture and heat generated during the drying process to escape, preventing the accumulation of lint and heat within the structure. Proper ventilation helps mitigate fire hazards associated with lint buildup and promotes better airflow in the dryer system, which can enhance drying performance and energy efficiency.

Terminating the duct inside the building, in the attic, or on the roof would create potential issues, including moisture problems, increased fire risk, and decreased dryer efficiency due to possible obstructions. Therefore, outside termination is the only method that adheres to both safety standards and efficiency practices outlined in mechanical codes.