How to Prevent Air Duct Contamination

To minimize duct contamination, it is essential to commit to a great preventative maintenance program.

Here are a few ways to prevent dirt from entering the system:

  • Use filters that are recommended by the manufacturers of your HVAC system.
  • Regularly change the air filters.
  • Change the filters more frequently if the filters become clogged.
  • Replace any missing filters and make sure there isn’t any gaps in between the filter and its holder.
  • During maintenance, be sure the service technician clean the pans and coils.
  • Seal off the supply and return registers and grilles during renovation and construction. Do not operate until all dusts in the area have been cleaned.
  • Vacuum your home regularly and use high efficiency vacuum (HEPA) cleaner and filter.

Along with dirt, moisture should not be present in ducts whatsoever. Moisture brings in biological growth in air ducts and should be prevented at all costs. Some steps you can take that can help prevent ducts from becoming wet:

  • Repair any leaks and/or water damage
  • Make sure the condensate pan drains properly; drain pan slopes toward the drain.
  • Make sure the ducts are properly sealed and insulated in all non-conditioned spaces.
  • if you are to replace your AC system, be sure to get a unit that is proper for your needs.
  • Be sure all ducts are sealed at the joints.
  • Avoid cleaning methods that requires moisture.


Here at California Air, we provide you with not only HVAC services but also up-to-date information about trending topics and helpful HVAC articles. We try to keep the community updated with what we do and what we hear. The more our community knows about our field and the world, the more we can relate.

Having problems with your air conditioning or heating systems?
Need repairs, replacements, installations, or maintenance?
No problem! We can help. Contact us today and we can help with your HVAC problems. We can help with your business or home; commercial or residential. We provide services to both. Our service area is within the Los Angeles County and surrounding areas.

Call us at (310) 530-0504 or visit our website at www.californiaac.com.

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