Sonya 30" Powerful Under Cabinet Stainless Steel Range Hood Kitchen Fan 1000cfm-2013 new top model Air Flow - This Range Hood has Maximum 1000 4 choices: CFM385CFM/575CM/785CFM/1000CFM Two motors, 2x15W LED lights which will illuminate all your cooking activities and more durable and energy saving. It also comes with easy-to-remove, dishwasher safe stainless steel baffle filters that will keep maintenance to a easier and quicker way. Gas Sensor - the rangehood will turn on automatically with 4 dynamic air flow settings changing from highest speed(F4), then decreasing the speed level at Medium Speed(F3), Low Speed(F2), Quiet Speed(F1)(20 seconds between each speed), and then stops after it sense the gas or smoke start to dissipate. Delay Function- While range hood is on, touch time delay button to active delay off timer, adjust to desired period of delay time. It counts down to "0" minute, then the blower will shut off automatically Non-return Air Flap keeps heat from escaping when hood is not in use.