ID, FD Fan Manufacturer, FD Fan supplies the required amount of hot air into the furnace for smooth and uniform combustion of fuel and also handles air at normal temperatures. The capacity/power rating of Induced Draft Fan will be more than the Forced Draft Fan. Essar Air Systems is a trusted name in manufacturing high-performance Boiler Induced Draft Fans, Boiler ID Fans, and I.D. Fans for industrial applications.