1)16" 20" 24",three different size 2)Large air volume, low noise 3)Air volume:2800-7500 m3/h PuTuo Industric Axial Flow Exhause Fan(FAT-I) axial fans are widely used to transport air in factories, workshops, warehouse and other relevant places for Petroleum refining, and production of various alcohols painting, spray drying, rubber production, food processing and medicine production