Unverified82% confidenceDecision RuleTime unknown
排烟管每增加一个90度直角弯头，相当于损失约1-1.5米有效排烟距离；直角弯头总数≤2个、总长≤4米时烟机排烟才不明显衰减，超过应改用45度弯头或增大管径
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