The present invention concerns a ventilation system (1),with a fluid channel system (2),with a sliding device (12) to provide mixing fluid (11) from cold flux (5) and/or hot fluid (8),where the slider arrangement (12) has a slider (13) which, in the context of a sliding motion (14), is between a hot position (15),a cold position (16) and at least an intermediate position (17) can be operated from time to time; where the slider arrangement (12) has a sliding shaft (18) in a circumferential direction (19) around its longitudinal axis (20) rotationally propelled on the slider (13) touching the slider (13) in the context of sliding motion (14) and where the ventilation device (1) has a locking device (21), defined between the slider (13) and the shaft (18) a bypass current (22) of mixed fluid (11) and/or cold flux (5) and/or hot fluid (8) a density gap (23),to reduce acoustic disturbances caused by bypass flow (22) during operation of the ventilation system (1).
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