All the vent openings are covered up, except for the one through which the cleaning is being done. One by one, the duct runs are all cleaned by inserting a rotary power brush (attached to a long, flexible cable) through the vent openings. As the brush spins and agitates the inside of the duct, the stirred-up dirt and debris is sucked out of the ventilation system and into the power vacuum collector.
The power vacuum collector and hand vacuums are all fitted with high efficiency, surgery room standard HEPA air filters, so no dust, fibers, or germs are released into the living spaces.
After all the ducts and the air-handling unit have been brush-vacuum cleaned, everything is reassembled, vent grilles are replaced, and the system is tested for proper function.
All surfaces in the home are well protected with drop cloths and plastic sheeting, and special care is taken to leave the home in the same condition as found before starting the job.