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Actual air studies by a reputable international organization, such as NAIMA, has conclusively proven that this in fact occurs in a ventilation system, which of coarse should be a no brainer because if particulate matter was merely stuck to the sidewalls of ductwork and did not in fact circulate, then mechanical engineers would have never invented a furnace filter. How many HVAC service technicians have instructed you to never use a furnace filter?Probably, not too many, right?That is because it has been known for several decades that dirt, dust and debris will always circulate in a forced air ventilation system. Fortunately, most people are not completely unaware of this problem and have realized that occasional HVAC system cleaning can produce very good indoor air quality results when performed thoroughly and correctly. A raging debate between various companies world wide tries to advertise and endorse their methods of cleaning to convince a consumer and potential customer that their method of cleaning is superior. Rather than writing a very obvious slanted article, I realized that simply stating what the advantages and disadvantages of each cleaning method is, would allow the consumer or potential customer to decide for themselves as to which cleaning method would best serve them. Yes, I can admit that every cleaning method has a clear advantage and disadvantage. Although I would love to make every consumer and or potential customer our customer, the reality is that many factors affect where a consumer or potential customer turns to for their indoor air quality needs. The power vacuum/air sweep method involves a powerful large diameter vacuum hose generally ranging in diameter from 8” 12” that moves anywhere from 3000 CFM – 26,000 CFM cubic feet per minute of negative air draw depending on the type of power vacuum machinery being used. Typically speaking, having power vacuum machines that moves anymore that 10,000 CFM is foolish, considering the fact that all ductwork is rated for a set amount of CFM based on the size of the ductwork through external static pressure ratings, velocity and ambience. I do have to admit that the more power a vacuum has, the cooler it is to witness, though. The power vacuum hose is typically installed into the ductwork via a circle cut out which allows for the power vacuum to put the entire side of the ductwork under a complete and sound vacuum draw.Posted by Anonymous at 3:19PM | (7 comments)