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Orange County Health Department Improvements Smith Sinnett /2024008 <br />Hillsborough,NC Orange County Asset Management Services <br />HVAC DUCTS AND CASINGS 23 31 00 - 4 <br />1.Hook or loop. <br />2.Nailed pin fasteners. <br />3.Expansion nails without washers. <br />4.Powder charged or mechanically driven fasteners (forced entry anchors). <br />5.Beam or "C"clamps without retaining clips or friction clamps (provide retaining clips <br />6.for "C"clamps). <br />7.Friction clamps for ductwork over 12". <br />8.Non-factory manufactured upper attachments for metal pan deck including wire coil and double circle <br />(Items 16 and 17 of Fig 4-3 of SMACNA HVAC Duct Construction Standards 95). <br />9.Wire hanger. <br />10.Trapeze hangers supported by wires or straps. <br />11.Rods,straps or welded studs directly attached to metal deck. <br />12.Drilled hole with attachment to structural steel. <br />13.Lag screw expansion anchor. <br />14.Rivets. <br />G Supporting devices shall be standard products of manufacturers having published load ratings. <br />H Unless drawings indicate the required framing,provide angle iron framing around roof opening where duct <br />penetrates through roof decking,to maintain roof decking structural integrity in accordance with roof <br />decking manufacturer's recommendations. This is not required for concrete decking. For concrete decking, <br />consult with Structural Engineer for location and size of opening prior to execution of Work. <br />I For welded ducts,soldered ducts or ducts with water tight joints,do not use supports utilizing screws or <br />other penetrations into ductwork. <br />J All hangers and supports shall be fully galvanized. <br />2.05 METAL DUCTS <br />A Material Requirements: <br />1.Galvanized Steel: Hot-dipped galvanized steel sheet,ASTM A653/A653M FS Type B,with <br />​G90/Z275​coating. <br />B Spiral Ducts: Round spiral lockseam duct with galvanized steel outer wall."Paint grip"finish if exposed to <br />view. <br />1.Manufacture in accordance with SMACNA (DCS). <br />2.Manufacturers: <br />a.EHG,a DMI Company​​ <br />b.GSI,a DMI Company​​ <br />c.Linx Industries,Inc,a DMI Company <br />d.MKT Metal Manufacturing <br />e.Or Approved Equal <br />2.06 FLEXIBLE DUCTS <br />A Flexible Air Ducts: <br />1.UL 181,Class 0,interlocking spiral of aluminum foil. <br />2.Insulation: Fiberglass insulation with ​aluminized​vapor barrier film. <br />3.Pressure Rating: 8 in-wc positive or negative. <br />4.Maximum Velocity: 5,000 fpm. <br />5.Temperature Range: Minus 20 to 250 degrees F. <br />2.07 LONGITUDINAL SEAM: <br />A Rectangular Duct: <br />1.Unless otherwise indicated,use Pittsburgh lock seam construction. <br />2.Seal longitudinal seams with approved sealant or provide pre-sealed from factory with encapsulated <br />mastic. <br />Docusign Envelope ID: 2D852F9B-A7CF-462A-9536-444A53AA848A