Unverified75% confidenceTradeoffTime unknown
止逆阀密封性越好（弹簧越紧）越能防倒灌，但同时增加排烟背压、降低烟机实际排风量；小风量烟机（≤17m³/min）搭配过紧止逆阀会明显影响吸烟效果
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75%
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Long-term
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