>> Search results for: BT4001 NSN Search Results National Stock Number (NSN) Description 4520-00-024-0198, 4520000240198 HEATER,DUCT TYPE,PORTABLE 4520-00-589-8451 , 4520005898451 HEATER,DUCT TYPE,PORTABLE 4520-00-620-4055, 4520006204055 Cancelled -> Replaced by 4520008591393 4520-21-898-0753 , 4520218980753 HEATER,DUCT TYPE,PO 4520-21-840-2144, 4520218402144 HEATER,DUCT TYPE,PO 1 Related Inventory Search You can use this search box to continue searching. Search parameters can include any combination of characteristics, specifications, description, partial part numbers, NSN or other stocking number. Special characters are not needed and are automatically stripped before searching. Do you sell this part? Become part of our growing pool of certified suppliers. Send Information