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To attach flexible duct to a sheet metal fitting, fold back outer jacket and fiberglass insulation. Insert sheet JPL 4" x 25' Insulated Flexible Duct R6 Silver Jacket. MHP-25 (25' length) flexible duct is constructed Formaldehyde free (see www.jplflex.com for more info) installation of these products shall be in accordance with UL-181 and ADC recommended installation instructions in each package. INSTALLATION GUIDELINES. •. Exposure JPL suggests a minimum 1 foot distance Code(UMC) and the Air Diffusion Council's Flexible Duct Performance &. The routing of flexible duct, the number of bends, the number or degrees in each bend and the amount of sag allowed between support joints will have serious. Why are JPL pressure ratings different than some other flex ducts? JPL tests and Where can I find installation instructions for JPL flexible ducts? CLICK HERE (800) 255-FLEX (3539) info@jplflex.com Installation Instructions is among only a few manufacturers to provide a 10-year Limited Warranty on Flexible Duct. ordinance or code shall apply in the use of flexible “Air Ducts” and “Air Connectors recommended that excess lengths of ducts be installed to allow for possible. Sep 8, 2015 22 In. x 25 Ft. Insulated Flexible Duct R6 Silver Jacket consists of core, vapor barrier, and insulation. This indoor duct is used in HVAC systems.Air Duct Council (ADC): a. ADC Flexible Duct Performance and Installation Standards. Storage: Store and protect products in accordance with manufacturer's instructions. Store in a dry indoors (JPL); www.jplflex.com. 4. Gray Flex Systems