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[BF] SMOKE DAMPER. A listed device installed in ducts and air transfer openings designed to resist the passage of smoke. The device is installed to operate automatically, controlled by a smoke detection system, and where required, is capable of being positioned from a fire command center.
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Related Code Sections

717.5.7 Fire and Smoke Protection Features, Smoke Partitions
A listed smoke damper designed to resist the passage of smoke shall be provided at each point that an air transfer opening penetrates a smoke ...