Signature Exhaust Fan: Exhaust fan provides a quiet operation with a brushless DC motor technology that continuously runs for a minimum of 70,000 hours, producing less than 0.3 Sones for a peaceful environment Adjustable Airflow: Easily switch between 80 and 110 CFM to meet your ventilation needs, ensuring optimal air quality and comfort in your bathroom Energy Efficient Design: Achieve superior energy efficiency with 15.4 CFM per watt, reducing your energy consumption and lowering your utility bills Easy Installation: Includes a 6" to 4" duct reducer, making it simple to install in a variety of setups, ensuring compatibility with your existing ductwork LED Indicators: Operates at user-preset levels (0, 30, 50, 60, or 80 CFM) with delay time presets (0.5, 5, 15, 30, 45, or 60 minutes); Green and Amber LED lights show continuous low-speed and full-speed modes