... -anticorrosion,anti-swing safety CWZ Series Maritime fanner---Smaller type fan 1.GeneralCWZ series marine or navy small-sized ... fans also have the features of good-anticorrosion, anti-swing, vibration resistance, shock resistance, shock resistance, stable running and safety ... be made into two structure types, type I (tube type), type II (porthole type): I tube type for ventilation of short tubes or ...