Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number SW4-1236 found under Impeller Fan Axial by Brookside Corp. The National Stock Number assigned to this part is 4140004939627, 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 SW4-1236.