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.
NSN 5905-01-253-4574
NSN 6320-00-646-3311
NSN 6685-01-397-0117
NSN 6150-01-073-7525
NSN 4140-01-152-2672
NSN 6135-01-607-5478
NSN 6320-01-108-5933
NSN 5835-00-957-3565
NSN 5835-01-064-6024
NSN 6145-01-512-7972
NSN 5835-00-789-1454
NSN 6620-01-445-4295