Unverified88% confidenceDecision RuleTime unknown
排烟管总长度控制在3米以内、弯头不超过2个，每增加一个90度弯头相当于增加约1.5米直管阻力，超过则需选大风量油烟机（≥18m³/min）补偿
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88%
Confidence
Long-term
Relevance
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Unverified排烟管每增加一个90度直角弯头，相当于增加约1.5-2米直管的阻力损失；实际排烟距离（直管+弯头折算）建议控制在3米内91% similarUnverified国标公共烟道预留孔径多为160mm或180mm，家用油烟机出风口常见150mm，需配150转160/180变径圈或止逆阀法兰盘实现密封过渡76% similarUnverified手动气吹的喷嘴内径应≤4mm且喷嘴长度≥5cm，才能精准伸入键帽间隙定向吹气；内径过大会导致气流分散，无法冲出缝隙深处灰尘74% similarUnverified顶吸机型的吊柜安装高度应保证机体底部距灶面65-75cm，过高（＞80cm）显著降低吸烟效果；侧吸则一般距灶面35-45cm安装72% similarUnverified挡风屏展开长度应达到炉具直径的2.5-3倍，包围角度覆盖约270度（三面包围），既能有效挡风又能保留一面散热排气防止燃气聚集72% similar
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