Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number D12722B found under Fan Centrifugal by Blowers Llc. The National Stock Number assigned to this part is 4140005678489, 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 D12722B.