It is essential to prevent your ducts from dust after cleaning, follow following step to minimize ducts contamination  Use the highest quality air filter, ask your technician for recommendation. Make sure to change filters regularly. B...

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It depends on how good the system was cleaned, how well it was maintained, and on the quality and the right installation of the filter. If everything was done properly it should stay clean up to 2-3 years.  It also depends on the personal...

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