The Panasonic FV-10VSL3 Bathroom Fan, 100 CFM WhisperValueLite Super Low Profile Ventilation w/ Light - for 4" Oval Duct continues the mighty legacy of Panasonic in the bathroom ventilation market. The WhisperValue-Lite Series fans are designed to outperform other bathroom fans in efficiency and energy savings, all while making sure it operates as quietly as possible. The powerful 100 CFM fan motor will add superior ventilation to any standard or large sized bathroom. The Panasonic FV-10VSL3 Bathroom Fan, 100 CFM WhisperValueLite Super Low Profile Ventilation w/ Light - for 4" Oval Duct is easy to install, and comes equipped with an integrated light. The 4” duct is oval shaped and will connect to an existing 4” flexible duct work. The low profile design of the FV-10VSL2 makes this fan visually more appealing. Bridging the gap between Quiet Operation and Convenience The aerodynamically designed fan technology provides outstanding performance without the sacrifice of generating a lot of noise. The super tight housing construction ensures that your fan will not rattle or buzz due to poor manufacturing. The slim design makes retrofitting your bathroom with a WhisperValue-lite model quick, easy, and most of all, affordable. This fan is Energy Star Certified for energy efficiency!