| 摘要 |
In a fan-operated suction device for intermittently occurring exhaust gases, in which channels connected to a suction device have orifice slits directed at the location at which the exhaust gases are produced, the slits are designed as suction nozzles (1, 2, 4), the orifices of which can be closed in the periods in which no exhaust gases occur by means of closure elements (flaps 3) mounted in the orifice region, while the fan continues to operate. <IMAGE>
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