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