MNI-25 is a UL-181 listed and labeled Class 1 non-insulated Air Connector. MNI25 is widely used in the HVAC industry as a supply, return, and exhaust duct in low to medium pressure air conditioning systems, and exhaust applications. The Connector is constructed with a spring steel wire helix, encapsulated in a polyester, aluminum foil, and polyester tri-laminate
JPL® 3-Ply Non-Insulated Flexible Air Duct, MNI-25 Series, Round Vent Duct, 25 ft Length, 4 in Diameter, 0.5 to 10 in-WG, Aluminum Foil/Polyester/Steel, Silver, 5000 fpm Velocity Rating, -20 to 200 deg F, 0.13 perm Vapor Transmission