PERFORMANCE: DC motor fan is tested to run continuously for 70,000 hours (8 years) LOW NOISE: Shower in peace with a noise level of 1.0 sone EFFICIENT: Energy savings of up to 85% makes it easy on your wallet RETROFIT-READY: Slim profile is perfect for retrofit, ceiling or wall-mount installation POWERFUL: 50 CFM circulates fresh air up to 50 sq. ft.