Ductwork
Apr 13, 2007 · Galvanized steel shall be in accordance with ASTM 5261; black or galvanized as herein after specified. DUCTWORK. Ductwork shall be galvanized steel, except as noted, in accordance with SMACNA HVAC Duct Construction Standard, except as noted. Provide gauges, construction and reinforcement as follows: Pressure class 2 inch. w.g. ................
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