Convertible range hood - this unit can be externally vented or recirculated (ductless) with charcoal filters (not included, model number CF1) to reduce harmful odors Easy-to-use push button controls let you easily control fan speed and lighting 4-Speed Fan Control (120/240/320/400 CFM) lets you choose the appropriate air flow for your cooking situation 400 CFM Air Flow (highest speed setting) efficiently moves large amounts of air away from your cooking area Ductwork easily connects to the top of the range hood for external venting Dishwasher-safe stainless steel baffle filters LED lighting illuminates the cooktop beneath the hood