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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 - 4 <br />2.Ductmate Industries,Inc,a DMI Company <br />3.Elgen Manufacturing,Inc <br />4.Durodyne <br />5.Or Approved Equal <br />B.Flexible duct connector shall be used where ductwork connects to fan apparatus or fan casings to <br />isolate vibration transfer. Connectors shall be attached in such a manner as to provide an airtight <br />and waterproof seal. <br />C.Connectors will comply with NFPA 90A,“Installation of Air Conditioning &Ventilation Systems”and <br />NFPA 90B,“Installation of Warm Air Heating &Air Conditioning Systems”. <br />D.Connector fabrics shall meet NFPA 701 (formerly UL 214.) <br />E.Connector fabrics shall be mildew resistant per ASTM G21. <br />F.Indoor installations shall be NFPA 701 listed,fire retardant Vinyl coated woven nylon or Neoprene <br />coated woven fiberglass fabric. Minimum density of Vinyl is 20 oz./sq.yd.and rated to 200F. <br />Minimum density of Neoprene 30 oz./sq.yard and rated to 200F. <br />G.Outdoor installations shall be NFPA 701 listed UV-resistant Hypalon coated woven fiberglass <br />fabric. Minimum density 24 oz./sq.yd.and rated to 250F. <br />H.High temperature applications shall be NFPA 701 listed,Silicone coated satin weave <br /> fiberglass fabric.Minimum density 17.5 oz./sq.yd.and rated to 500 F. <br />I.Chemical resistant applications shall be of Teflon coated woven fiberglass fabric.Minimum density <br />18 oz./sq.yd.and rated to 500 F. <br />J.Fabricate in accordance with SMACNA (DCS)and as indicated. <br />K.Flexible Duct Connections: Fabric crimped into metal edging strip. <br />2.09 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.Single Blade Dampers: <br />1.Fabricate for duct sizes up to 6 by 30 inch. <br />2.Blade: 24 gage,0.0239 inch,minimum. <br />D.Multi-Blade Damper: Fabricate of opposed blade pattern with maximum blade sizes 8 by 72 inch. <br /> Assemble center and edge crimped blades in prime coated or galvanized channel frame with <br />suitable hardware. <br />1.Blade: 18 gage,0.0478 inch,minimum. <br />E.End Bearings: Except in round ducts 12 inches and smaller,provide end bearings. On multiple <br />blade dampers,provide oil-impregnated nylon,thermoplastic elastomer,or sintered bronze <br />bearings. <br />F.Quadrants: <br />1.Provide locking,indicating quadrant regulators on single and multi-blade dampers. <br />2.On insulated ducts mount quadrant regulators on stand-off mounting brackets,bases,or <br />adapters. <br />3.Where rod lengths exceed 30 inches provide regulator at both ends. <br />DocuSign Envelope ID: 94E7997D-4F29-42F6-A9B4-0A160438D2A6