The QuietCool QC-2250 (U. S. Patent #7497774) will help you slash your A/C related electricity costs by up to 90%*and pays for itself faster than any other "green energy" product on the market today. The QC-2250 moves 2,285 CFM on High and 1,829 CFM on Low and is the perfect fan for homes that may feature additional fans in bedrooms; instead of a larger central unit, combine a QC-2250 with smaller individual bedroom fans for private, zoned control and watch your electricity bills go down even more! For vertical wall installations, order vertical wall adapter (part number : QC-60092)