Thermofin of Florida, Inc.       Service with a personal touch    Air Friction Loss in Straight Runs Duct Materials and Specifications: Duct: Type 3003, all aluminum, air and water tight. One end crimped for male/female assembly. Insulation: One wrap of 1.5" thick .075 lb density fiberglass. Vapor Barrier: .003 thick seamless Vinyl Film. Moisture resistant to 0.2 Perms. Universal Application for Low to High Pressure Maximum Velocity: 5000 F.P.M. Maximum Working Pressure: Inches of water: 12"W.G. Maximum Vacuum: Inches of water: 12"W.G. Temperature Range: -100F to 435F.