Outstanding air circulation with the Lasko Power Plus 20 in. 3-Speed Box Fan. The fan includes our innovative Wind Ring system for 20% more air velocity. The wider body allows for greater stability while the easy to carry handle makes portability a breeze. The patented Weather-Shield motor allows for easy free use in your window.Innovative Wind Ring20% More Air VelocityWider Body for Greater StabilityDurable Steel BodyEnergy EfficientEasy-Carry HandleTop-Mounted Speed Control KnobPatented Weather-Shield motorETL ListedPatented Safety Plug