How to Clean Mildew in Air Vents

The circulation of air throughout a house also causes the circulation of other things. Dust, dirt and mold spores get pulled through the ventilation system when the heat or air conditioning is running. Mold growth in the ventilation system is likely to cause odors and health problems. When mold grows in a ventilation system, it is difficult to reach but may not always require a professional duct cleaning service.

  1. Clean the area around any vent grates or ducts. Use a vacuum to go over the flooring around the vent grates, and use the vacuum hose to go over the grate itself.

  2. Remove the vent grates. If they are not held in place by screws, remove them by hand; if they are held in place by screws, unscrew those first.

  3. Soak the vent grates in de-greaser for approximately 15 minutes. If you are concerned about damaging paint, use a mild detergent instead.

  4. While the vent grates are soaking, use the vacuum hose to clean as much of the inside of the vents as you can reach. This will help to keep air flow unobstructed.

  5. Perform an ozone shock treatment on the ventilation system. Set up an ozone generator near where the system intakes air. Intake vents are usually somewhere in the house. (These vents wouldn't be pushing out air when the furnace is running). Disconnect the duct connected to your furnace by unscrewing the screws that hold it to the furnace unit.

    Once the ozone generator is set up, put it on the highest setting and run it for several hours. While you are performing an ozone shock treatment, keep people, plants and pets out of the house. After several hours, shut the generator off.

  6. Vent the house for a couple hours before returning to the home. Open windows and doors, run the furnace or central air conditioning to vent the house and clear the system dead mold.