Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number MDL F 1 found under Fan Centrifugal by Hill Ross Controls Corp. The National Stock Number assigned to this part is 4140013686968, 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 MDL F 1.