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EDI Identifies HVAC Problem at Mississippi School

During a tour of a Mississippi elementary school, the EDI staff noticed that a clerestory window had been closed from below. School officials said that gypsum board around the window had deteriorated because of moisture in the cafeteria. The building was always humid, particularly after rain storms.

Using a sheet of notebook paper, the EDI staff were able to determine that the make-up air fan on the kitchen exhaust hood was not working. Thus, when the hood was on, the cafeteria was under negative pressure, which pulls hot, moist air into the building during late summer and early spring. With the problem identified, the school district was able to take corrective action (i.e. the make-up fan was repaired) and moisture problems have ceased.


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