HIGH-QUALITY FAN: Quiet, energy efficient exhaust fan operates at 80 CFM and 0.7 sones to help control air quality EFFICIENT: Powerful ventilation removes moisture, so your surroundings will always be comfortable EASY INSTALLATION: Easy to install new/replace existing product with retrofit installations that can be done entirely from roomside – no attic access required RELIABLE PERFORMANCE: Reduces air leakage by up to 50% compared to competitive models, resulting in better home performance IDEAL SIZE: Measures 9.25" x 10" x 5.75" and fits 2" x 6" ceiling construction with 4" duct connector with damper