21.000 in.Lg, 2.000 in.Id;
An item composed of one or more materials, molded, compressed, and/or baked into a rigid covering of irregular shapes and sizes. it is designed to cover air ducts and/or air duct fittings used in air conditioning, heating, cooling, pressurizing and de-icing systems to restrict the dissipation of heat. it may completely or partially encase the item for which designed. it may be furnished with or without fillers, cement, and/or separate or attached accessories for installation, (excluding flexible air duct covering and rigid pipe and pipe fitting coverings used in construction and building materials). Excludes insulation blanket, thermal, aircraft; insulation pipe fitting covering, thermal; and insulation sleeving, thermal.
Classification: Other parts of airplanes or helicopters for use in military aircraft (excludes propellers, rotors, undercarriages, and parts thereof)
NSN 6650-00-557-5482
NSN 6105-01-370-2574
NSN 6620-01-031-3989
NSN 6150-01-472-4124
NSN 5925-01-352-0657
NSN 6105-00-242-6835
NSN 6610-01-575-2406
NSN 4140-01-206-4981
NSN 5975-00-125-2347
NSN 5915-01-359-4847
NSN 5855-00-198-3197
NSN 5855-01-464-3152