Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number MU2A1OR028021 found under Fan Tubeaxial by Comair Rotron. The National Stock Number assigned to this part is 4140001130989, 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 MU2A1OR028021.