Residential HVAC Installation Practice Exam

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Prepare for your Residential HVAC Installation Exam with engaging quizzes and multiple-choice questions. Each question includes hints and insightful explanations to ensure you're ready for the test!

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Airflow pressure in ductwork is measured in inches of ____.

Feet of water column
Inches of mercury
Inches of water column
Feet of mercury

The correct answer is: Inches of water column

Airflow pressure in ductwork is typically measured in inches of water column (WC). This measurement is commonly used in HVAC systems because it allows for a more precise reading of the pressure difference within the ductwork. Inches of water column refers to the height in inches that a column of water would need to be in order to exert the same pressure as the airflow in the ductwork. This measurement is more appropriate and accurate for residential HVAC installations compared to feet of water column, inches of mercury, or feet of mercury.