Product HighlightsFlex-Vent KM is a thermally insulated, fully lined, UL 181 Class 1 flexible air duct designed for low to medium pressure cooling and heating HVAC systems. It can be used in either supply or return sections and provides economical means for handling misalignment between systems components and ducting around obstacles where fabricated and fitted ducts are difficult and costly to use. It is equally suitable for new jobs or retrofit work and is especially useful whenmaking system extensions or for changing conditioned zones, now or in the future. Compliance to NFPA Standards allows you to install lengths longer than the 14' limitation applying to connectors. It is a highly efficient part of the total duct system because the smooth liner, the ample insulation and tough outer vapor barrier provide good airflow, thermal insulation and a double air seal.
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Weight 13.35 Pounds Length 15.13 Inches Width 24.88 Inches Height 15.13 Inches Country of Origin USA Brand Thermaflex Tier KM R-Value R6 Jacket Material Vapor Barrior Vapor Transmission 0.1 Certifications Yes NFPA 90 A and 90 B Color Silver, Pink Composition Fiberglass Construction Strong Polyester film laminated and encapsulating a heavy corrosion resistant steel wire helix, forms the inner core and supports a thick blanket of fiberglass insulation over a fiberglass scrim. The outer vapor barrier is a bidirectional reinforced metal Core Material Corrosion Resistant Steel Wire Helix Fire Rating Meets UL 181 & NFPA 90A-90B Fire Codes Inside Diameter 9" Insulated Yes Maximum Air Flow 5000 FPM Maximum Pressure Positive 4''-16'' - 10wg, 18''-20'' - 6''wg Negative 4''-12'' -1wg 15''-20'' - 1/2 wg Maximum Temperature 250°F (121.1°C) Operating Temperature -20°F to 250°F (-28.8°C to 121.1°C) Pressure Rating WG - Positive 10 inches (4"-16" ID), 6 inches (18"-20" ID) - Negative: 1/2 inch (4"-20" ID) Size 9" x 25' Warranty Offered Yes Compliance NFPA 90 A and 90 B UL Listed Yes UL Recognized Yes
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