We were hired to clean the ductwork in a 52-register home with 3 Air Handing Units located in the Attic and Basement. The registers located throughout the house were in the ceilings, walls and along the baseboards. The ductwork was both exposed in the attic and mechanical room while it was enclosed in the living area. Duct & Vent Cleaning of America, Inc made access ports as needed to reach the interior of the ductwork. We also used HEPA filtration Vacuums to create negative pressure in the ductwork. We used cable brush systems to loosen debris and hand vacuumed ductwork that was accessible.