Kelvinator KV-28F900 36" kitchen hood has auto start function by hood built-in heat sensor, blue LED, electromechanical push button, timer function, vertical air discharge, dual-centrifugal blower type, 8" round duct diameter, washable stainless steel two filter, 4 hood fan speed, depth 19-11/16", height 42-9/16", and width 35-7/8".