VENTILATION SYSTEM

To control a balance of air volume between a supply air stream by a ventilation device and a first exhaust stream by the ventilation device which merges with a second exhaust stream by an exhaust device from becoming uneven by reducing the supply air stream by the ventilation device when the first exhaust stream reduces on the basis of a pressure loss due to influence from the second exhaust stream.SOLUTION: A ventilation system 50 includes: a ventilation device 1; an exhaust device 2; an air stream merging part 3 for causing a first exhaust stream from the ventilation device 1 to merge with a second exhaust stream from the exhaust device 2; and a control unit 4 for reducing a supply air volume of a supply air stream from the ventilation device 1 in accordance with an exhaust air volume of the first exhaust stream which reduces on the basis of a pressure loss due to influence from the second exhaust stream in the air stream merging part 3.SELECTED DRAWING: Figure 1 【課題】排気装置による第二排気流と合流した換気装置による第一排気流が、第二排気流の影響による圧力損失に基づいて減少した場合、換気装置による給気流を減少させ、換気装置による給気流と第一排気流との風量のバランスが不均一になることを抑制する。【解決手段】換気装置１と、排気装置２と、換気装置１からの第一排気流と排気装置２からの第二排気流とを合流させる気流合流部３と、気流合流部３における第二排気流の影響による圧力損失に基づいて減少した第一排気流の排気風量に応じて、換気装置１からの給気流の給気風量を減少する制御部４と、を備えた換気システム５０。【選択図】図１