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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. By doing so, every vent attached to the ductwork will have a centrally created vacuum present for proper
system containment. From there, various mechanical brushes are sent down the rounds to break and push all debris down to where the power vacuum is sucking.