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There are mold spores everywhere in our indoor and outdoor environments.

In order for mold to grow, it needs three things:

  1. Moisture
  2. Something for the mold to feed on, like carpeting or food remnants.
  3. A temperature in the right range to support mold growth (from 40°F to 100°F)

So yes, if there is something in the air ducts for mold to feed on, and if the temperature is right, mold can grow in air ducts. Mold needs 24 to 48 hours of the right conditions to start growing, so there is a time element also.

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Q: Can moisture in air conditioner ducts cause mold?
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