Panasonic FV-05-11VKS1 Whisper Green Select Fan Customizable, all in one dc motor fan, less than 0.3 sconce Pick-a-flow speed selector switch 50-80-110 CFM. Built in multi- speed 0, 30-110 CFM with time delay Duct Diameter-4 & 6 inches. Mounting Opening (in sq.)- 10-1/2 inch. Grille Size (in sq.)- 13 inch Select up to 2 additional Plug n play modules (condensation sensor, motion sensor or niteglo LED night light) Flex-z-fast bracket provides flexible, fast and easy installation Customizable, all in one DC motor fan, less than 0.3 sone Pick-A-Flow speed selector switch 50-80-110 CFM Built in Multi- Speed 0, 30-110 CFM with Time Delay Select up to 2 additional plug n play modules (Condensation Sensor, Motion Sensor or NiteGlo LED Night Light) Flex-Z-Fast bracket provides flexible, fast and easy installation