Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number B550-225S CW found under Impeller Fan Axial by Revcor Inc. The National Stock Number assigned to this part is 4140014116666, and the Federal Supply Class is 4140 Fans Air Circulators And Blower Equipment. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like B550-225S CW.