Lasko 20 Weather-Shield Premium Box Fan Plus with Patented, isolated Weather-Shield motor for worry-free window use; High performance grill for ultimate air flow; Three quiet speeds; Save-Smart Less than 2 per hour; Top-mounted controls; Easy-carry handle; Includes a patented, fused safety plug; E.T.L. listed; 21-1/2 L x 4-1/2 W x 22-1/2 H