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"This depends on the size of the home, the number of vents, and the level of dust. For many homes, it can take somewhere between 2 to 4 hours to fully clean air ducts. Professional cleaning includes the return air vents, the supply air vents, and the return drop. However, jobs are assessed independently, and the actual time might differ."
<https://www.powervacofottawa.ca/duct-cleaning/>