11/02/2026
A spot near an air vent can look alarming, but it doesn’t automatically mean mold is growing inside your ducts. The bigger clue may be moisture that keeps coming back—think leaks, condensation, or a damp filter. Learn how humidity control and simple HVAC checks can help prevent mold, plus which signs suggest the problem may need a closer look. What should you watch for beyond the vent cover?
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