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� <br /> ; <br /> � <br /> • � D. Non-critical piping and conduit sha11 give way to ducts. <br /> � <br /> PART 2i-PRODUCTS <br /> i <br /> 2Jl MATERIAL <br /> I <br /> � A. Galvanized Sheet Steel: Lock-forming quality, ASTM A 527, <br /> � Coating Designation G 90. Provide mill phosphatized finish for <br /> � exposed surfaces of ducts exposed to view. <br /> � <br /> I B. Aluminum Sheets: ASTM B 209, Alloy 3003, Temper H14, sheet <br /> � form with standard, one-side bright finish for ducts exposed to <br /> ; view and with mill finish for concealed ducts. <br /> � <br /> I <br /> � C. Sheet metal, angles,bar slips, hangers, and straps: Galvanized steel <br /> for galvanized duct, aluminum for aluminum duct. <br />' D. Screws: Cadmium plated galvanized duct, aluminum for aluminum <br /> duct. <br /> E. Joint Sealers: Mineral impregnated woven fiber tape and plastic <br /> • type activator/adhesive manufactured by Hardcast, Inc., 3M, <br /> Benjamin Foster, or approved equal. <br /> 2.2 FABRICATION <br /> i A. Provide rectanb lar or round duct where required on drawings of <br /> ! prime quality galvanized steel or aluminum sheets,thickness and <br /> � reinforcement as required by the following schedule, SMACNA, or <br /> local and state codes, whichever is more stringent. When <br /> fabricating low pressure ductwork, largest duct dimension governs <br /> the entire duct and complete joint. <br /> B. DUCTWORK GAUGE AND REINFORCEMENT SCHEDULE <br /> MAXI� M DUCT SLIP STANDING <br /> DIMENSION GAUGE GAUGE SEAM REINFORCEMENT <br /> � (1N.) <br /> � Up th�u 18 24 24 -- -- <br /> � 19 - 30 24 24 1 x 24 ga. No <br /> 31 -4� 22 22 1 x 24 ga. No <br /> 43 - 54 22 22 1-1/2 x 20 ga. 1-3/8 x 1/8 Band Iron <br /> • 5� - 60 20 20 1-1/2 x 20 ga. 1-3/8 x 1/8 Band Iron <br /> ICT 9� 184 <br /> 15890 - 3 <br />