The iLIVING 20 inch Variable Speed Wall Mounted Shutter Exhaust Fan is designed to effectively ventilate spaces up to 825 square feet with an impressive airflow of 3,300 cubic feet per minute (CFM). Ideal for barns, warehouses, and greenhouses, this exhaust fan features a durable wall-mounted design and variable speed control to meet your ventilation needs. Enhance air circulation and maintain optimal conditions in your agricultural or industrial environments with this powerful 20-inch exhaust fan.