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。6 a6 Q! u2 h0 g# X2 R) z
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。$ ]) W$ u* C) L; u
7 v0 r1 l% d; V* e4 h) R. V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。 ( ?& c( p3 C0 e% {( k* g$ y6 D% P9 N9 \! j9 f* @! S
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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.