HVAC Journeyman Practice Exam

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What is the minimum distance from the ground to any metal duct?

2 inches
4 inches
6 inches
12 inches

The correct answer is: 4 inches

The minimum distance from the ground to any metal duct is important to ensure safety and proper airflow within HVAC systems. A measurement of 4 inches is commonly specified as the minimum distance. This spacing prevents potential damage to the ductwork from contact with debris or water on the ground, which can lead to deterioration of the metal or create unsanitary conditions. Moreover, maintaining this distance also facilitates easy access for inspection and maintenance, reducing the risk of blockages or other issues that could impact system performance. In contrast, distances that are too small may not offer adequate protection, while distances that are much larger do not provide any additional benefit and could be impractical in terms of installation requirements.