Commercial kitchen exhaust outlets that terminate above the roof must locate the discharge opening at least how many inches above the roof surface?

In commercial kitchen setups, proper ventilation is crucial for maintaining air quality and safety. The requirement for exhaust outlets to be positioned a specific height above the roof surface is primarily aimed at minimizing the possibility of exhaust re-entering the building and ensuring effective dispersion of grease-laden vapors and odors.

The code requires that the discharge opening must be located at least 40 inches above the roof surface. This height is determined to be adequate for preventing the exhaust from being drawn back into any air intake systems on the building, such as those used for heating, ventilation, or air conditioning. By maintaining this height, it helps to prevent cross-contamination of air quality and ensures that the cooking and chemical fumes are discharged effectively into the atmosphere without posing a risk to occupants or nearby structures.

This specific requirement is critical for compliance with safety regulations and best practices in commercial kitchen design.