HVAC Journeyman Practice Exam

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What is the minimum gauge steel duct that can be used in a residence where the duct size is less than 14 inches in diameter?

The correct answer is: 26

The minimum gauge steel duct that can be used in a residential setting for ducts less than 14 inches in diameter is 26 gauge. This standard is established to ensure adequate strength and durability while maintaining a reasonable weight for ease of installation. Steel ducts of this gauge provide a good balance between structural integrity and efficient airflow, reducing the possibility of damage from airflow pressure or external forces. Using a thicker gauge, such as 24, might be unnecessarily heavy and costly for smaller ducts, while a thinner gauge might compromise the duct's integrity and lead to potential issues like deformation or noise. Therefore, the selection of 26 gauge is not only compliant with the industry standards but also practical for residential applications.