The Broan Custom Power Module PM390 is a fully integrated range hood system designed to fit flush with the bottom of a cabinet or custom hood installation; Built-in mounting system; Minimum height above cook top: 24 IN; Durable, powder coated silver finish and a fully enclosed bottom ensure this hood is easy to clean and will not discolor; One-piece, washable aluminum mesh filter; Optional non-ducted filter kit model 357NDK for indoor exhaust recirculation (includes duct accessories and charcoal filter), sold separately, replacement charcoal filter is B08999040; Optional 30 IN and 36 IN liners (LB30, LB36, LT30 and LT36) allows to create a custom enclosure and protects the cabinetry (sold separately); Heat Sentry detects excessive heat and adjusts blower to high speed automatically; Damper included