... , Centrifugal fan, Ventilation, Ventilating Fan, Blower, Industrial Fan, Ventilation, Ventilator Fan, Ventilation, Ventilator Fan, Air Mover, Air Moving Application: To adjust airflow direction and air status ... .Specification: Square from 100X100mm to 800X2, 000mm or diameter from129mm to 508mm. Shutter, Exhaust Fan, Ventilation