How To

How to Prevent Mold Growth in Air Ducts

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By LynnKeller
eHow Community Member
(2 Ratings)

Molds can produce allergens, irritants or potentially toxic substances so prohibiting their growth is a good way to protect your health. Moisture in your air ducts can lead to the growth of mold. This article addresses ways to prevent air ducts from becoming wet.

Difficulty: Moderate
Instructions

Things You'll Need:

  • Mastic
  1. Step 1

    Repair any water leaks in your home as soon as possible after you notice them.

  2. Step 2

    Prevent water from condensing in the ducts by insulating the heating and cooling system. The air ducts in the attic or crawl space should be insulated and sealed also. Call a professional for evaluation if you are uncertain if the systems are insulated. This should have been done when the system was installed. If you have an older system this may be something that should be checked.

  3. Step 3

    Make sure the air ducts for the heating and cooling system are sealed; this will help eliminate condensation. By looking at the joints, some leaks may be spotted. A professional can test the system for the appropriate pressure to find small leaks also.

  4. Step 4

    In many homes the joints for the ducts are not sealed when the heating and cooling system is installed. If duct tape was used to seal the joints, make sure the adhesive has not dried out. Mastic can be used to create a permanent seal on the seams of the ducts and should be available at a local hardware store.

Tips & Warnings
  • Remember that controlling moisture is the most effective way to prevent mold growth.
  • If you are replacing your central air conditioning system all ducts must be sealed at the joints. Make sure the unit is the appropriate size for your house. If the unit is too big, moisture may be removed poorly due to frequent cycling of the air conditioning system.
  • If your air ducts are in the heated and cooled area of your home leaky duct problems are less likely than if the air ducts are in the basement or crawl space. Attics and exterior walls are the worst place for air duct leakage.

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