About 4 years ago, we had the duct work cleaned by a local company. Recently we had some hardwood floor put down in place of carpet so we wanted the duct work cleaned thoroughly. Two family members have allergies, so dust in the house causes frequent sneezing. Todd, of Ozone Duct Cleaning, using professional grade equipment, completed a thorough cleaning of the duct work, bathroom exhaust, air exchange system, furnace, and dryer vent. Todd identified areas of dust left behind from when the house was built 11 years ago. Allergy symptoms as mentioned earlier, seem to be reduced since the duct work cleaning has been completed. Todd's work was very professional, and I would recommend him and his company to anyone requiring duct work cleaning.