| 摘要 |
PROBLEM TO BE SOLVED: To reduce the cost of a ventilator, and also to simplify the drive control. SOLUTION: A ventilator is provided with a ventilation part 16 provided with a ventilation fan to be operated by driving a drive source a cylindrical body 51 which is extended outdoors from the ventilation part 16, provided with a ventilating opening 26 on its forward end, and divided into an indoor air exhaust part K4 and outdoor air suction part K5 by a partitioning plate 52, and a control valve 71 which is oscillatingly arranged on the cylindrical body 51, and opened/closed by the differential pressure to be formed between the indoor air exhaust part K4 and the outdoor air suction part K5. When the ventilation fan is stopped, no differential pressure is formed between the indoor air exhaust part K4 and the outdoor air suction part K5, and the ventilating opening 26 is in the closed condition. When the ventilation fan is operated, the differential pressure is formed, and the ventilating opening 26 is in the opened condition. |
