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Also if any home security wiring, telephone wires or low voltage wiring is ever present in the ductwork, the physical nature of the contact cleaning
method in air duct cleaning will increase the chances in breaking such wires, whereas air washing will not compromise such wires in any shape way or form. Most contact cleaning companies will recommend that
you should have your air ducts cleaned out every year or two, because they know they left enough debris in the ductwork to try to get at it again in a year or two. Well there you have it folks. Both common methods in air duct cleaning really do have advantages and disadvantages. I attempted to write this article as fair and balanced as I could using as many facts based on past experiences that I have experienced in performing over 10,000 residential and over 2000 commercial air duct cleanings using both methods of cleaning. Based on my past experiences the advantages and disadvantages in both methods of air duct cleaning that I wrote about are very much so true in my experiences.