Design Duct Extension Accessory Kit Available for 9' to 11.5' Ceilings Bright LED lighting shines throughout the cooking surface Performance 8" round duct at discharge. Efficiency Blower will automatically turn on at high speed if excessive heat is sensed in the control area. Absorb odors with charcoal filters. Convenience Convenient timer built into control from 1-60 minutes. Signal on LCD display will illuminate as a reminder to check filters for cleaning. Audible tone when select controls are pressed.