When it comes to duct cleaning, there is no evidence that it can prevent health problems. Studies have not been able to conclusively prove that particles in the air ducts can enter the living space. It is important to note that dirty air ducts are just one of many possible sources of pollutants in homes. Pollutants from both outdoor and indoor activities, such as cooking, cleaning, smoking, or just moving, can cause greater exposure to pollutants than dirty air ducts.
There is no evidence that a small amount of dust or household waste in air ducts poses any health risk. Most people don't realize that the air they breathe in their homes can be just as bad, if not worse, than outdoor air. Ducts filled with dust, dirt, and other debris can cause respiratory problems. Duct cleaning methods vary, although industry associations that deal with air duct cleaning have established standards. While a significant amount of dust in air ducts sticks to the sides and never enters the indoor air of a home, dirty air ducts can contain more than just dirt. If no one in your home has allergies or unexplained symptoms or illnesses and if, after a visual inspection of the inside of the ducts, you see no evidence that the air ducts are contaminated with large deposits of dust or mold (there is no musty smell or visible mold growth), it is probably not necessary to clean them.
If you think that cleaning the ducts might be a good idea for your home, but you're not sure, talk to a professional. Most organizations that deal with duct cleaning, including the EPA, NADCA, NAIMA, and the National Association of Metal Plate Contractors and Air Conditioning (SMACNA), do not currently recommend the routine use of sealants to encapsulate contaminants in any type of duct. Local air conditioning companies or service providers often promote the idea of cleaning air ducts as another way to prevent indoor air pollution and improve air quality. The key to avoiding duct contamination is to create a solid preventive maintenance routine, regardless of whether you choose to clean your home's air ducts. On the other hand, if a service provider doesn't follow proper duct cleaning procedures, it can cause problems with indoor air.
Some service providers may also suggest applying chemical treatments (sealants or other encapsulants) to encapsulate or cover the inner surfaces of air ducts and equipment housings because they believe this will control mold growth or prevent the release of dirt particles or fibers from the ducts. In most cases, the dust is harmless and, in fact, cleaning the air ducts could lead to bigger problems, such as duct damage. One of the best things you can do to preserve optimal indoor air quality in your home or workplace is to schedule routine duct cleaning. Cases in which the use of sealants to encapsulate duct surfaces may be appropriate include repairing damaged fiberglass insulation or combating damage caused by duct fires. You can also contact professional duct cleaning service providers and ask them about the services they offer.
