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HVAC
NCI Commercial System Performance Specialist
Building Pressure Management
Vérification des connaissances
Building Pressure Management
Vérification des connaissances
Vérification des connaissances
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A commercial building has a total supply airflow of 4,500 CFM and total exhaust airflow of 4,500 CFM. Building pressure reads -0.03 inches w.c. What is the most likely explanation?
A
The exhaust fan is oversized and cannot be balanced to match supply airflow
B
The building has too many windows, allowing natural ventilation to depressurize the space
C
Supply duct leakage in unconditioned spaces is delivering some air outside the building before it reaches occupied zones, creating a net exhaust-dominant condition
D
The measured supply and exhaust are equal, so building pressure should be neutral - the manometer reading must be incorrect
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