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DUCT ACCESSORIES <br />Section 15910 <br />15-1207 <br />D. Construction: <br />1. Frame: Maximum 5 inch (127 mm) roll formed, galvanized steel channel. <br />2. Sleeves: Damper shall be supplied as a single assembly with an integral factory <br />sleeve. <br />3. Retaining Angles: Damper shall be supplied with factory retaining angles sized to <br />provide installation overlap in accordance with manufacturer's UL listing. <br />4. Blades: Galvanized curtain type. <br />5. Closure Springs: Type 301 stainless steel, constant force or spring clip type. <br />6. Temperature Release Device: 165 degrees F fusible link unless noted otherwise. <br />E. Damper to be capable of being mounted in either a vertical or horizontal orientation. <br />F. Duct Transition Connection, Damper Style to be provided as required. <br />2.05 TURNING VANES <br />A. Fabricated Turning Vanes: Provide fabricated turning vanes and vane runners, constructed <br />in accordance with SMACNA "HVAC Duct Construction Standards," latest edition. <br />B. Acceptable Manufacturers: <br />1. Dura -Dyne Corporation <br />2. Ductmate <br />3. Or equal <br />2.06 DUCT ACCESS DOORS <br />A. Acceptable Manufacturers: <br />1. Nailor <br />2. Ductmate <br />3. Vent Fabrics <br />B. General: <br />Provide airtight access doors in ducts and plenums for cleaning and repairs for <br />volume and fire dampers for control devices within such ductwork and where shown <br />on the Drawings. <br />2. Access doors into 2" w.g. pressure class ductwork shall be made of No. 24 gauge <br />galvanized steel minimum, reinforced with angle iron stiffeners. Doors shall be <br />hinged and provided with latches and gasket around entire edge to provide an <br />airtight fit. Reinforce openings for doors with structural steel. <br />3. Access doors into ductwork greater than 2" w.g. pressure class shall be <br />side -mounted equal to Nailor Series 0800 for rectangular ducts and Nailor Series <br />0895 for round ducts. Access doors shall be tested at 8 -inch static pressure. Access <br />door height shall not be less than 75% of duct height. <br />4. Access doors shall be sandwich -type construction, consisting of three layers of .030" <br />galvanized steel. The inside door shall combine two layers of metal spot welded <br />together at rim and encapsulating high density fiberglass insulation —UL classified <br />F <br />