The sharp r1871t 1.1 cu. Ft. 850w over the range convection microwave oven provides added room. The simple installation includes a built-in exhaust system that offers three convenient venting options - horizontal, vertical or ductless recirculation - to provide convenience for range-top cooking. The oven has an interactive cooking system with custom help key for easy-to-follow cooking and programming instructions. It is also equipped with a 4-way convection system that browns, bakes, broils and crisps.