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F. Reinforcement Shapes and Plates: Unless otherwise indicated,provide galvanized steel reinforcing where installed <br /> on galvanized sheet metal ducts. For stainless steel ducts provide reinforcing of compatible materials. <br /> G. Aluminum Sheet: Where indicated,provide aluminum sheet complying with ASTM B 209, Alloy 3003, Temper <br /> H14. <br /> H. Tie Rods: Galvanized steel, 1/4-inch minimum diameter for 36-inch length or less;3/8-inch minimum diameter for <br /> lengths longer than 36 inches. <br /> I. Flexible Ducts: Spiral-wound spring steel with flameproof vinyl sheathing, or corrugated aluminum; complying <br /> with Ul 181. Class I. <br /> 1. Where installed in unconditioned spaces other than return air plenums, provide 1" thick continuous flexible <br /> fiberglass sheath with vinyl vapor barrier jacket. <br /> 2. Ducts in air return plenums must comply with Code flame and smoke requirements. <br /> 3. Manufacturers: Subject to compliance with requirements,provide flexible ductwork of one of the following: <br /> Wiremold 86A <br /> Wiremold 57LF <br /> Wiremold 57LFK <br /> Wiremold WC <br /> Wiremold WCK <br /> Thermaflex S.LP.10 <br /> Thermaflex M-K <br /> 2.02 DUCT LINER <br /> A. General: Comply with NFPA Standard 90A and TRVIA Standard AHC-101. <br /> B. Materials: ASTM C 1071,Type H,with coated surface exposed to airstream to prevent erosion of glass fibers. <br /> 1. Thickness: 1 inch. <br /> 2. Density. 1-1/2 pounds. <br /> 3. Thermal Performance: "K-Factor"equal to 0.28 or better,at a mean temperature of 75 deg F. <br /> 4. Fire Hazard Classification: Flame spread rating of not more than 25 without evidence of continued <br /> progressive combustion and a smoke developed rating of no higher than 50, when tested in accordance with <br /> ASTM C 411. <br /> 5. Liner Adhesive: Comply with NFPA Standard 90A and ASTM C 916. <br /> 6. Mechanical Fasteners: Galvanized steel,suitable for adhesive attachment,mechanical attachment,or welding <br /> attachment to duct. Provide fasteners that do not damage the liner when applied as recommended by the <br /> manufacturer,that do not cause leakage in the duct,and will indefinitely sustain a 50-pound tensile dead load <br /> test perpendicular to the duct wall. <br /> a. Fastener Pin Length: As required for thickness of insulation, and without projecting more than 1/8 inch <br /> into the airstream <br /> b. Adhesive For Attachment of Mechanical Fasteners: Comply with the "Fire Hazard Classification" of <br /> duct liner system <br /> 15891-4 No.99132-CP2 <br />