Step up to Lasko's 3-Speed Weather Shield Performance Box Fan and enjoy the benefits of the Wind Ring system, featuring an exclusive grill design that focuses the air movement to increase its velocity. This high-performance fan runs on three quiet speeds and includes the exclusive Weather-Shield motor, making it safe to use in windows. Lightweight and easy to carry, it costs just two cents an hour to operate, helping you save on energy costs without sacrificing power.

Lasko #3720 20" Weather-Shield Performance Box Fan 2-Pack - B0747JWJS2