Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number FSD-212-20 IN DIA found under Terminal Ventilation Duct by Greenheck Fan Corp. The National Stock Number assigned to this part is 2040015609374, and the Federal Supply Class is 2040 Marine Hardware And Hull Items. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like FSD-212-20 IN DIA.