The Vornado 633DC Circulator is the latest medium-sized whole-room circulator in the Energy Smart™ family. With the simple variable speed that ensures precise control of the air flow, you can easily adjust from a whisper breeze to a thundering rush of air. The 633DC features classic Vornado Vortex Action for whole-room circulation, keeping the entire room cool and comfortable. Complete with our 5-year satisfaction guarantee, these DC circulators will keep you comfortable for years (and years) to come.