Delta BreezSlim VFB050B3A1 50 CFM Exhaust Bath Fan, White, 1 Sone Energy star certified with dc motor technology 1 sone - the quietest ever in a 7.5-Inch x 7.25-Inch bath fan model Annual energy cost for 24/7 operation is approximately 6.73 Ultra low power consumption at 6.4-Watt with an energy effciency rating approximately 8.9 cfm/watt at 0.1-Inch static pressure Ships in Certified Frustration-Free Packaging The only 7.5-Inch x 7.25-Inch small size energy star certified bath fan in the market