NuTone QT200 High Capacity Twin Ventilator, 200 CFM 2.0 Sones 200 CFM 2.0 Sones Quietest twin ventilator blower Powerful and quiet ventilation for large baths-rec rooms-offices and conference rooms up to 375 square feet Adjustable hanger brackets provide mounting between 16-inch on-center joists Gracefully curved rounded grilles so slim they project a scant 5/8-Inch from the ceiling