Z Line 698-40 1200 CFM Range Hood Insert, 40" Powerful air flow requires ducted, external venting Easy-to-use push button controls let's you easily control fan speed and lighting 4-Speed Fan Control (280/460/670/1200 CFM) let's you choose the appropriate air flow for your cooking situation 1200 CFM Air Flow (highest speed setting) efficiently moves large amounts of air away from your cooking area while maintaining a relatively quiet kitchen environment (56 decibals) Ductwork easily connects to the top of the range hood