It started with a phone call from Ken Jensen of the Building and Grounds department at Williams College in Williamstown, Mass. to Four Seasons Heating & Cooling, Inc, in nearby Dalton, Mass. regarding a dryer exhaust problem in a dormitory. There were two laundry rooms on the first floor of the building, each containing five dryers. Lint was escaping from both exhaust systems, entering the HVAC system and being distributed throughout the four-sto

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