... AND LOWER NOISE -. LIGH WEIGHT AND COMPACT SIZE -. EXTERNAL MOTOR O. SIROCCO FAN APPLICATIONS-. Fan filter unit, Clean room, Air cleaner-. Humidifier, dehumidifier ... range hood, heat recovery exchangerO. MOTOR-. External motor-. 115-120V 60Hz, 220V 50Hz, 220V 60Hz-. 100% Speed controllable-. Protection class of enclosure : IP44 ...