Section 23 31 00 - HVAC DUCTS AND CASINGS
B. Openings shall be as large as feasible in small ducts, 300mm by 300mm (12 inch by 12 inch) minimum where possible. Access sections in insulated ducts shall be double-wall, insulated. 1. Refer to SMACNA HVAC Duct Construction Standards. 2.5 FIRE DAMPERS ................
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