Providing adequate ventilation to rooms subject to humidity and moisture is vital especially for a bathroom, kitchen and laundry. To exhaust this humid air is to help eliminate moisture, mould and mildew which can cause structural rot and health risks.
If you have an existing hole, make sure you choose an exhaust fan with a hole size big enough to fit this existing hole, or one with a larger hole size if you are able to extend the size of the holes.
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