Duct from Commercial hood - Clearance NFPA 96

Discussion created by gbogatyrevich on Feb 9, 2017

The duct from the commercial hood runs in the ceiling space. What minimum clearance shall we provide between the duct and combustible ceiling above (the ceiling has 2-hour fire rating though), and between the duct and T-bar ceiling? What minimum clearance is required to the combustible wall, considering reduction measures? Is ceiling space considered enclosure?