The Windows Type Ventilation Fan --Plastic materials --Good design --No noise voice, very silent --Cheaper, longer life The Windows Stype Ventilation FanModelWR-15, Rating power : 16W, Size: diameter 186mmWR-20, Rating power: 22W, Size: diameter 248mmProducts FeatureThe Windows Type Ventilation Fans are usually set up on the windowpane, which are appreciate for air conditioning in the place with ...