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(0.7 CEU; 45 minutes) Building pressures cause the infiltration of outdoor air and the exfiltration of indoor air. Unbalanced airflow between supply and return ducts can cause positive pressures in some rooms and negative pressures in others. Duct air leakage in intermediate zones can make the building either positively or negatively pressurized. This micro course explains these phenomena.

Please study the short reading assignment under the Materials tab carefully because this is a tricky subject.