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Orange County Health Department Improvements Smith Sinnett /2024008 <br />Hillsborough,NC Orange County Asset Management Services <br />AIR DUCT ACCESSORIES 23 33 00 - 3 <br />7.SEMCO LLC​​ <br />8.Or Approved Equal <br />B Fabrication: Rigid and close fitting of galvanized steel with sealing gaskets and quick-fastening locking <br />devices.For insulated ducts,install minimum 1-inch thick insulation with sheet metal 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 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 maintenance. <br />Provide insulated or acoustically lined doors to prevent condensation where 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 with Figure <br />7-3 of the 2005 SMACNA Manual,"HVAC Duct Construction Standards,Metal &Flexible,"Third Edition. <br />Doors shall be rated for +/-10"w.g. <br />2.06 DUCT TEST HOLES <br />A Temporary Test Holes: Cut or drill in ducts as required.Cap with neat patches,neoprene plugs,threaded <br />plugs,or threaded or twist-on metal caps. <br />B Permanent Test Holes: Factory fabricated,air tight flanged fittings with screw cap. Provide extended neck <br />fittings to clear insulation. <br />2.07 VOLUME CONTROL DAMPERS <br />A Manufacturers: <br />1.MKT Metal Manufacturing​​ <br />2.Nailor Industries Inc​​ <br />3.NCA,a brand of Metal Industries Inc​​ <br />4.Ruskin Company​​: <br />5.United Enertech​​ <br />6.Greenheck <br />7.Pottorff <br />8.Johnson Controls <br />9.Air Balance,Inc. <br />10.Or Approved Equal <br />B Fabricate in accordance with SMACNA (DCS)and as indicated. <br />C Round Control Damper -1 in w.g.and below: <br />1.Velocity:Up to 2,000 fpm <br />2.Temperature:180°F <br />3.Construction: <br />a.Frame Material -Galvanized Steel <br />b.Frame Thickness:20 gauge <br />c.Blade Material:Galvanized Steel <br />d.Axle Bearings:Bronze​​ <br />e.Axle Material:Plated Steel <br />f.Operaror:3/8 inch sq.locking manual quandrant. <br />1)On insulated ducts,provide 2 inch standoff bracket <br />g.Manufacturers: <br />1)Greenheck MBDR-50 <br />2)Ruskin <br />3)Nailor <br />D Round Control Damper -4 in w.g.and below: <br />1.Velocity:Up to 3,000 fpm <br />Docusign Envelope ID: 2D852F9B-A7CF-462A-9536-444A53AA848A