Multi-speed slide control allows you to choose the perfect speed to keep up with whatever you are cooking Four 20 watt halogen lights (included) provide unparalleled lighting over and around the cooktop Dishwasher-safe aluminum filters ensure your hood will capture grease at optimum levels with regular cleaning Telescopic flue accommodates 8' to 9' ceilings -- optional flue extension available for ducted (FX54SS) and non-ducted (FXN54SS) applications Internal blower delivers 480 CFM (less than 300 CFM when using ARP6 reducer) Non-ducted kit RK54 for indoor recirculation (purchased separately); order replacement filter FILTERSQUARE to keep the kitchen fresh Heat Sentry™ detects excessive heat and adjusts blower speed to high automatically to prolong product life