Slim 20 inch box fan provides high volume air movement •Energy-efficient fan helps keep you feeling cooler while spending less than 2¢ per hour to operate •Top-mounted manual controls are easy to reach •3 high-performance fan speeds •Weather-resistant motor for worry-free window use •Durable steel frame •Safe, rounded corners •Equipped with Lasko's trusted, fused safety plug •Use in conjunction with an air conditioner to boost cooling airflow