How are the ducts cleaned?
There are three generally accepted methods. The first way is called the contact method and is simply
using a conventional vacuum sweeper with a HEPA filter to suck the dirt and debris out of the ducts. This
method requires more and larger openings in the duct and is more likely to let the contaminants get into
The second method is called the air sweep method. In this process, compressed air is introduced into the
duct system using a skipper nozzle to loosen debris. A vacuum (either portable or truck mounted) is
attached to the system to pull the debris out of the ducts.
The final method is using a rotary brush to sweep the debris off of the walls and out of the ducts. Once
again, a vacuum is attached to catch the contaminants.