GDF series centrifugal fan is widely used for ventilation in enterprises, civil buildings, hotels, stores, hospitals, theaters, halls, colleges and research institutes. Environmental temperature range-----20°C~80 °c Particles contain in the air shall not exceed 120mg/m The air transferred shall not contain any toxic, corrosive and adhesive materials Rectangular Duct Ventilation Fan Strong body, durable Supper strong structure design with the single bearing outer rotor motor Sirocco front forward impeller design, high pressure, large air volume Eversion motor installation design, easy to maintain.