Indoor air quality complaints from employees can be quite common in office environments. Symptoms such as red or itching eyes, cough, colds, allergies, headaches and unusual odors are some of the issues that can be reported by building occupants. In the course of investigating contributing causes, a review of the buildings use history, inspection of the immediate complaint area and measurement of various airborne contaminants may not reveal a likely source. This is when a trip to the air handling unit (AHU) on the roof becomes necessary.
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