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In the event of a vent fan failure, an alarm is initiated.
出现排气扇故障情况时，将出现报警。
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An optional backup vent fan operates in the event of a primary vent fan failure.
如果主排气扇出现故障，则备用排气扇将启动。
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An optional backup vent fan operates in the event of a primary vent fan failure.
如果主排气扇出现故障，则备用排气扇将启动。
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