... -10 Industrial Centrifugal Draught Fan is mainly used for the smoke drafting of boilers. 2. Product Characteristics-Driving mode: coupling-Optional ... Product PartsCoupling Mode: case, impeller, air inlet, motor, system base, main shaft, driving system (bearing house, bearing), coupling4. Parameters of Product Performance ... and Density5) Altitude of Operation Place Centrifugal draught fan for boilers