AGITATION DEVICES

AGITATION DEVICES

There are three basic accepted agitation devices available for disturbing contaminants and sending them into the airstream created by the negative air machine. First, there is manual agitation by means of contact vacuuming. This method requires physical access to all surfaces either by reaching through access openings or physically entering the duct system. Next, there are a variety of air nozzles used to blow the contaminants off the duct surfaces. They require the purchase of a portable air compressor in addition to other equipment. Because they do not make contact with 100% of the inner surfaces, there can be doubts as to whether all surfaces were cleaned. The third agitation device in use is the rotary brush device. These consist of a brush or other cleaning device spinning on the end of a motor driven shaft. In most cases, a flexible shaft is used for ease of operation and to accommodate turns in the ducts themselves. Many duct cleaning jobs require the use of more than one technique.