NFPA-96 Section 5.1.2 requires that all seams, joints and penetrations of the hood enclosure that direct and capture grease-laden vapors and exhaust gases shall have a liquidtight continuous external weld to the hood’s lower outermost perimeter. This helps to contain a fire within the hood where it can be extinguished by the exhaust hood’s fire suppression system.

Posted in: Fire Suppression System Questions