How high above the roof should an exhaust (Type 1) outlet terminate?

The requirement for the height of an exhaust (Type 1) outlet is crucial for ensuring proper ventilation and preventing issues such as backdraft or re-entrainment of exhaust gases. An exhaust outlet typically needs to terminate at least 40 inches above the roof surface. This height is designed to minimize the risk of exhaust fumes entering the building’s air intake or surrounding areas, facilitating better airflow and promoting safety.

The specified 40 inches height helps ensure that the exhaust is effectively directed away from the roof, avoiding any potential air quality problems or interference with building ventilation systems. Compliance with this height standard is essential for meeting building codes and ensuring optimal system performance.