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Same question as this — but for bathroom ventilation fans now.

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  • These are pictures of indoor grilles. It is the outdoor ones that you need to look at and they should be configured to auto-close and/or prevent pests. Animals do build nests in them and they should be setup to prevent that.
    – Nelson
    Jul 20 at 7:08
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Yes…see my answer for kitchen exhaust fan.

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