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r <br />|i * » <br />i / <br />[ <br />£ <br />C <br />C <br />c <br />c <br />I <br />c <br />i <br />I <br />I <br />I <br />I <br />c. <br />ceilings. The Contractor shall be responsible for the <br />Sleeves and preapred openings. <br />and sleeve for insulated ducts, except at grilles# registers and diffusers. ^ ^ lies. <br />Allow one-inch clearance between <br />opening or one-inch clearance between insula- <br />tion and opening for insulated ducts, except at <br />Sallies, registers and diffusers. <br />c. Collars: Provide of not less than four inches wide <br />on each side of walls or floors where sleeves or <br />prepared openings are installed. Fit collars snuolv <br />of°enM insulation. Ground smooth edges^ <br />tion iiy preclude tearing or puncturing insula- <br />Supports: Unless otherwise indicated, provide not less <br />than two one-inch by 1/16" galvanized strap-iron h!nSers <br />spaced one on each side of duct. Anchor risers in Shl^enter <br />of the vertical run, to allow ends of riser free vertical <br />i.ductwork shall be securely anchored <br />4?^"® construction in a manner to be free <br />tioJ ^Slnairfo? conditions of operation. Hanger for ducts smaller than 60" x 24" shall <br />duct with a minimum of two 92) screws <br />the accordance with <br />Duct Size Strao Size inn <br />Up to 17" X 11" <br />18" X 12" to 18 ga. X 1"w C D1O3o•o•30" X 15" <br />31" X 16" to 18 ga. X 1"w 6'-0" o.c. <br />60" X 24"1/8" X 1" W 6'-0" o.c. <br />Ducts larger than 60" x 24" shall <br />trapeze hangers consisting of rods be supported with <br />and angles. <br />2.ino^inaies risers pass through floors, support <br />?e?s i tidiir/ii f;rd*Cc?.‘2i?rj?.%\e, <br />maSSJJ!®** adjoining floor construction in an approved <br />15840-8 <br />1 a