The 18 deep design provides 20% more coverage over the cooktop than the standard over-the-range microwave combination units, Optional 7 in. round BP87Q damper sold separately, The 4-way convertibility of this hood provides flexible installation for use in either ducted or non-ducted applications. Discrete recirculation louvers are hidden at the top of the hood, which helps to provide a smooth, clean appearance, Non-duct capable with use of charcoal filter (HPFX1), sold separately. Hidden ductless louvers on top of hood exhaust away from cabinetry, Range hood is installed as hardwired or with an optional power cord kit (SHCK44; sold separately), With a powerful 2-speed fan offering 270 Max Blower CFM, this range hood provides adequate capture for electric and most gas ranges, One-level lighting system includes a bright LED bulb to illuminate the cooking surface (bulb included), Perfect for replacement as well as new installations, this powerful 4-way convertible range hood will fit into most all applications. The enclosed light and fan/filter assembly makes for easier cleaning, Dishwasher-safe aluminum mesh filter provides highly efficient grease removal, ADA compliant, remote operation is possible using a standard UL approved wall switch