Useful in a small equipment closet to avoid air stratification. Hang it from the ceiling, pointing downward, without worry of the "blades" hitting you on the head should you come in contact with them. Doesn't move a tremendous amount of air (even on high) but it does the intended job. So far, one of two failed after a year of being on 24/7. Not a bad deal, protecting telecom equipment for a year for twenty bucks.