HVAC SYSTEM RECIRCULATES COPIER EMISSIONS P-TRAKTM ULTRAFINE PARTICLE COUNTER CASE STUDY #8 Background Workers in first one, then two, and then three offices on the third floor of a 22-story office building were suffering from headaches and eye and nose irritation. The building manager routinely measured the standard indoor air quality (IAQ) parameters, i.e., CO 2 , temperature, humidity and ventilation. All tests met applicable standards and guidelines. The manager also checked the system balance and searched for evidence of mold. The building seemed to pass all the conventional tests. However, he suspected that it wasn’t as clean as it appeared. Unable to resolve these complaints, the building manager called in an IAQ investigator to thoroughly study bu

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