HVAC Journeyman Practice Exam

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How frequently should supports be installed for round ducts that are less than 10 inches in diameter?

8 feet on centers
10 feet on centers
6 feet on centers
12 feet on centers

The correct answer is: 8 feet on centers

For round ducts that are less than 10 inches in diameter, the recommended practice is to install supports at intervals of 8 feet on centers. This spacing provides adequate support to prevent sagging or deformation of the ductwork, ensuring that the system maintains its efficiency and airflow characteristics. Proper support is crucial for maintaining the integrity of the duct system, as it helps to minimize stress and potential damage over time. Using 8 feet as the support spacing aligns with industry standards for smaller diameter ducts, facilitating effective installation and serviceability while complying with building codes. The other options suggest larger spacing, which may not adequately support smaller ducts, potentially resulting in issues that could affect airflow and system performance.