The Frigidaire Undercabinet 36" Ventilation Hood Feature A Filter Indicator Light That Reminds You When It'S Time To Replace Your Carbon Charcoal Filter To Continue Capturing Odors And Circulating Fresher Air. Also Offers Led Lighting That Illuminates The Cooktop, Capacitive Touch Controls That Make Selecting Fan And Lighting Options Easier, And A Three Speed Fan That Recirculates Air At 330 Cfm.