


Most people are now aware that indoor air pollution is an issue of growing concern and increased visibility. Many companies are marketing products and services intended to improve the quality of your indoor air. You have probably seen an advertisement, received a coupon in the mail, or been approached directly by a company offering to clean your air ducts as a means of improving your home's indoor air quality. These services typically — but not always — range in cost from $450 to $1,000 per heating and cooling system, depending on the services offered, the size of the system to be cleaned, system accessibility, climatic region, and level of contamination.
If you decide to have your heating and cooling system cleaned, it is important to make sure the service provider agrees to clean all components of the system and is qualified to do so.
Duct cleaning generally refers to the cleaning of various heating and cooling system components of forced air systems, including the supply and return air ducts and registers, grilles and diffusers, heat exchangers heating and cooling coils, condensate drain pans (drip pans), fan motor and fan housing, and the air handling unit housing.
If not properly installed, maintained, and operated, these components may become contaminated with particles of dust, pollen or other debris. If moisture is present, the potential for microbiological growth is increased and spores from such growth may be released into the home's living space. Some of these contaminants may cause allergic reactions or other symptoms in people if they are exposed to them. Failure to clean a component of a contaminated system can result in re-contamination of the entire system, thus negating any potential benefits. Methods of duct cleaning vary, although standards have been established by industry associations concerned with air duct cleaning. Typically, a service provider will use specialized tools to dislodge dirt and other debris in ducts, then vacuum them out with a high-powered vacuum cleaner.
In addition, the service provider may propose applying chemical biocides, designed to kill microbiological contaminants, to the inside of the duct work and to other system components. Some service providers may also suggest applying chemical treatments (sealants or other encapsulants) to encapsulate or cover the inside surfaces of the air ducts and equipment housings because they believe it will control mold growth or prevent the release of dirt particles or fibers from ducts. They should only be applied, if at all, after the system has been properly cleaned of all visible dust or debris.
If you choose to have your ducts cleaned, the service provider should:
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Open access ports or doors to allow the entire system
to be cleaned and inspected. |
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Inspect the system before cleaning to be sure that
there are no asbestos-containing materials (e.g., insulation, register boots,
etc.) in the heating and cooling system. Asbestos-containing materials
require specialized procedures and should not be disturbed or removed except
by specially trained and equipped contractors. |
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Use vacuum equipment that exhausts particles outside of
the home or use only high-efficiency particle air (HEPA) vacuuming equipment
if the vacuum exhausts inside the home. |
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Protect carpet and household furnishings during
cleaning. |
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Use well-controlled brushing of duct surfaces in
conjunction with contact vacuum cleaning to dislodge dust and other
particles. |
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Use only soft-bristled brushes for fiberglass duct
board and sheet metal ducts internally lined with fiberglass. (Although
flex duct can also be cleaned using soft-bristled brushes, it can be more
economical to simply replace accessible flex duct.) |
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Take care to protect the duct work, including sealing and re-insulating any access holes the service provider may have made or used so they are airtight. How to Determine if the Duct Cleaner Did A Thorough JobA thorough visual inspection is the best way to verify the cleanliness of your heating and cooling system. Some service providers use remote photography to document conditions inside ducts. All portions of the system should be visibly clean; you should not be able to detect any debris with the naked eye. After completing the job, ask the service provider to show you each component of your system to verify that the job was performed satisfactorily. Ask your service provider to correct any deficiencies that you noticed during your after cleaning inspection. |