My mask is making a whistling noise

Most masks have exhalation ports (look for a tiny cluster of holes) that allow the escape of our CO2 (carbon dioxide). When routinely cleaning your mask parts, these tiny holes must be checked to make sure they are not soiled and clogged by body oil or bedding lint. When clogged, they can cause the mask to make a whistling noise. Use a sewing needle or toothpick to keep the holes free flowing.

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