同样PANASONIC抽汽扇, 为何其中一个更响?

我最近请人装了两个一样的PANASONIC抽汽扇, 却一个比另一个响不少. 我发现响的扇的屋顶 VENT 是 新装的 4" T-TOP ROOF JACK, 轻的是原来的 4" ROOF CODE CAP. Roof code cap is taller than t-top.

My roof is flat. I don't know if the difference in the roof vent for the exhaust fan contributes to the difference in noise. The fan is supposed to be only 0.3 sone.

Thank you.

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