Q: While reviewing plans for a 180 sq. ft. room containing a 2 hour oor-ceiling assembly, the UL design (L502) indicat- ed that the total area of a duct open- ing in the suspended ceiling cannot exceed 198 sq. in., and the aggregate duct openings cannot exceed_____. per 100 sq. ft. of ceiling area. What size damper can be used in this application?
99 square inches aggregate duct opening per 100 sq. Ft of ceiling.