37 Tex. Admin. Code § 263.20 - Duct Dampers
Air conditioning and ventilation duct work in new facilities and new additions shall contain dampers to resist the passage of smoke at each point a duct penetrates a smoke partition or floor level; such ducts shall close automatically upon the detection of smoke. (Exception: this rule does not apply for duct work which is part of a smoke detection or smoke management system.)
Notes
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