The WhisperFit DC FV-0511VFL1 with dimmable LED Lighting and Night Light is an ENERGY STAR rated ventilation fan that is super quiet and energy efficient. The Pick-A-Flow Speed Selector gives you the option to choose either 50, 80 or 110 CFM making this fan customizable to your needs. The single hinged Flex-Z Fast Installation Bracket provides flexible, fast and easy ceiling installation in 3 steps. This fan is ready for a 4 in. duct and includes a 3 in. duct adapter if needed. This is your perfect choice for remodeling and/or new construction or renovation from below the ceiling.. Powerful: the ECM DC motor with SmartFlow technology ensures optimal CFM output and desired airflow. Sound: extremely quiet less than 0.3 sones at 50 CFM, 0.3 sones at 80 CFM and 1.0 sones at 110 CFM when using 4 in. duct. LED lighting: includes 1-Watt - 10-Watt dimmable LED chip panel with 1 less than 1-Watt LED night light (night light must be wired separately), the LED lamp offers a warm white illumination with 3000K) and 700 Lumens (70 lumens/watt) for a long-life energy efficient operation and 50,000 hours rated average life, it is ENERGY STAR 2.0 certified and JA-9 compliant for CA title 24. Construction: low profile housing design at 5-5/8 in. deep, fits in 2 in. x 6 in. construction. Installation: alignment guide slides housing in place for a tight fit temporary clip holds fan in place, so installer has 2 hands free to insert motor templet to assure hole size and protect parts from dust and slide and snap-in junction box and duct collar. Certifications: UL Listed for tub/shower enclosure when GFCI protected, and Home Ventilating Institute (HVI) certified. Code compliant: can be used to comply with ASHRAE 62.2, LEED, IAP, and California title 24. Warranty: 6 year warranty on ECM motor 3 year warranty on parts and 5 year warranty on LED chip panel. <a href=https://www.homedepot.com/c/electronics_recycling_programs style=color:#F96302 target=_blank>Click here for more information on Electronic Recycling Programs</a>. Air Volume (CFM): 110,50,80. Fan Sound Level (Sones): 0.3,1.0. Installation Type: Ceiling. Features: Light. Max Room Size (sq. ft.): 110. Features: Nightlight. Grill Shape: Square. Housing Length (in.): 10.25