HVAC Journeyman Practice Exam

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How much clearance is required from combustible materials for unlisted units heaters?

  1. 3 inches

  2. 6 inches

  3. 12 inches

  4. 18 inches

The correct answer is: 6 inches

For unlisted units heaters, a clearance of 6 inches from combustible materials is required. This distance is important to prevent any risk of fire and to ensure safe operation. Maintaining this clearance allows for proper airflow around the heater, which is critical for efficient operation and helps reduce the risk of overheating. The 6-inch requirement is based on safety standards that dictate necessary separations to mitigate potential hazards associated with heat and combustion components of the heater. Ensuring this clearance helps comply with local codes and ensures safe installation practices, which protects both the equipment and property.

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