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Southern Human Services Center Smith Sinnett /2020072 <br />HVAC and Roof Renovations Orange County,North Carolina <br />Air Duct Accessories 23 33 00 - 3 <br />B.Mesh:1/2 inch square pattern,1/16 inch galvanized wire,interwoven,welded at wire intersections <br />and to the frame to prevent rattles. <br />C.Frames:Minimum of 1 inch by 1 inch by 1/8 inch galvanized steel angles for duct sizes through 24 <br />inches,1-1/2 inch by 1-1/2 inch by 3/16 inch for duct sizes between 25 inches and 48 inches,and <br />2 inches by 2 inches for ducts larger than 48 inches continuous around perimeter of screen. <br />Provide intermediate supports to limit screen deflection to 1/16 inch at maximum design airflow. <br />2.05 FLEXIBLE DUCT 90°ELBOW SUPPORT <br />A.Manufacturers: <br />1.Build Right Products <br />2.Hart and Cooley <br />3.Thermaflex <br />4.Or Approved Equal <br />B.Pre-manufactured support to form any brand flexible duct into a smooth 90 degree elbow. <br />1.One size shall fit 4"to 16"flexible ducts <br />2.No additional tools shall be required for installation <br />3.UL listed for use in Return Air Plenums <br />2.06 DUCT ACCESS DOORS <br />A.Manufacturers: <br />1.Acudor Products Inc,a Division of Nelson Industrial Inc <br />2.Ductmate Industries,Inc,a DMI Company <br />3.Durodyne <br />4.Elgen Manufacturing <br />5.MKT Metal Manufacturing <br />6.Nailor Industries Inc <br />7.Ruskin Company <br />8.SEMCO LLC <br />9.Or Approved Equal <br />B.Fabrication: Rigid and close-fitting of galvanized steel with sealing gaskets and quick fastening <br />locking devices. For insulated ducts,install minimum 1 inch thick insulation with sheet metal <br />cover. <br />1.Up to 18 inches Square: Provide two hinges and two sash locks. <br />2.Up to 24 by 48 inches: Three hinges and two compression latches with outside and inside <br />handles. <br />C.Access doors with sheet metal screw fasteners are not acceptable. <br />D.Provide access doors of adequate size to allow easy access to the equipment that will require <br />maintenance.Provide insulated or acoustically lined doors to prevent condensation where <br />applicable. <br />E.Manufacturer shall provide a neoprene gasket around perimeter of access door for airtight seal. <br />F.Systems 2"w.g.or less shall use a hinged,cam,or hinged &cam square framed access door. <br />G.Systems 3"w.g.and above shall use a sandwich type access door.Construct doors in accordance <br />with Figure 7-3 of the 2005 SMACNA Manual,"HVAC Duct Construction Standards,Metal & <br />Flexible,"Third Edition.Doors shall be rated for +/-10"w.g. <br />2.07 DUCT TEST HOLES <br />A.Temporary Test Holes: Cut or drill in ducts as required. Cap with neat patches,neoprene plugs, <br />threaded plugs,or threaded or twist-on metal caps. <br />B.Permanent Test Holes: Factory fabricated,air tight flanged fittings with screw cap. Provide <br />extended neck fittings to clear insulation. <br />2.08 FLEXIBLE DUCT CONNECTORS <br />A.Manufacturers: <br />1.Carlisle HVAC Products <br />DocuSign Envelope ID: 94E7997D-4F29-42F6-A9B4-0A160438D2A6