Lifeplus high-speed drum fans is an ideal choice for industrial, commercial, covered courtyards, warehouses, and factories. The 24 inch high-speed drum fan is designed specifically for industrial use and can effectively move dust. It has 3 types of wind speeds: low, medium, and high, which can meet your needs and cool down every corner. The maximum air supply distance is 5620 CFM per minute and 35 feet.