Electrolux ECVW3662AS 36" Wall Mount T Shape Hood DCS an alarm will sound for an alarm will sound for 10 seconds to let you know it's time to empty and replace the bucket Model #: Id660 Spd 77Ba (Shown) Constructed From Durable Glass Fiber Reinforced Concrete(Gfrc) And Easily Assembled On Site Using Less Energy From The Motor To Achieve The Same Level Of Efficiency Sleek Design Make A Statement With This Beautiful Design With Signature Electrolux Pinstriping Responsive Sensor This Hood Uses A Responsive Sensor That Can Detect Excess Heat Coming From The Cooking Surface And Responds Automatically To Ensure Proper Ventilation Perimeter Venting Premium Perimeter Venting Uses Narrow Channels To Create Natural Suction