多半是管道不够大。比如参数是400CFM的抽油烟机意味着每分钟排出400立方英尺的空气。你还会看到一个参数,比如1.2sones。% @. u* D5 m) f* N
sone是排风的噪音评级,和分贝不同,更侧重主观感受,是线性的。0.9是比较静,如同洗手间顶的排风扇,工作中的冰箱。0.3是超静音,一般吸尘器则有50sones。5 {8 h2 a- ^0 X5 k/ l. D3 t
- q; D" ~# g, j7 Q: J) _; s有的抽油烟机标称在最大300 CFM是只有0.9sones就非常不错,有的在 200 CFM是已达到4.5sones。按你描述,估计超过了5sones,很可能是排风管是瓶颈。3 n n) x( h$ @8 h
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I bought the same model and update to 7" tube(?). I think the noise problem is normal just because you have higher expectation since we paid more. I usually use level 3-4 and that is enough.