Kitchenaid KXW9748YSS 48-Inch Commercial-Style Series Wall-Mount Canopy Hood requires a powerful 600 or 1200 CFM 3-speed motor for internal or inline (attic or crawl space) installation. Ventilation system may be placed over a cooking surface with a maximum heat output up to 108K BTUs. Hidden 3-speed control makes it easy to select fan speed and operate lights without detracting from overall design. Food warming lamps may be turned on to help keep food warm until it's ready for serving. Premium dishwasher-safe commercial-style baffle filters offer durability and capture more steam, grease, and odors.