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NEW YORK - With IAQ a growing concern, Rotobrush is telling contractors that now is the perfect time to establish a duct cleaning business. The company is offering not just an air duct cleaning system but complete support with all the training, marketing tools, and tech support needed to develop a profitable business. The company notes that its patented “brush and vacuum” technology is easy to use and effective. And it’s a one-person operated system, so there’s no need for additional staff.