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 5835-01-115-6067
NSN 5998-00-375-4259
NSN 5965-01-254-6527
NSN 6220-00-165-1509
NSN 5965-00-529-0602
NSN 5998-01-503-0401
NSN 5945-00-308-2612
NSN 6240-01-004-9634
NSN 5930-01-609-6023
NSN 5965-01-098-1306
NSN 6685-01-356-8177
NSN 6650-01-540-3865