This Rubber-Cal HVAC Insulated-Flex ducting is a 4-inch diameter, 25-foot long ventilation hose designed for both residential and industrial air movement applications. Constructed with double-ply aluminum foil and PET film layers, it features glass wool insulation that provides both thermal and acoustical benefits. The metallic silver duct is highly compressible for easy transport and is ideal for permanent or mobile air conditioning units, operating effectively in temperatures ranging from -20 to 160 degrees Fahrenheit

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