Residential HVAC Installation Practice Exam 2026 - Free HVAC Practice Questions and Study Guide

Question: 1 / 400

Airflow pressure in ductwork is measured in inches of ____.

Feet of water column

Inches of mercury

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.

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Feet of mercury

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