Covertible Ventilation provides more installation options, Install your hood without needing to vent outside, Equipped for cooktop outputs up to 44.5K BTUs, Regulate air in your chimney with the included 6" round damper, Help trap unwanted grease and remove odors, Three fan speeds let you choose the right amount of ventilation, Easily see what you re cooking with LED task lighting, Extends chimney height for ceilings from 8'4" to 12'4"