HVAC Journeyman Practice Exam 2026 - Free HVAC Practice Questions and Study Guide

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What is the required clearance above the top of a casing for an unlisted upflow furnace?

12 inches

8 inches

6 inches

The required clearance above the top of a casing for an unlisted upflow furnace is 6 inches. This clearance is essential for several reasons, including ensuring safe air circulation, allowing for proper combustion, and providing space for maintenance and service access.

In HVAC systems, adhering to clearance requirements is critical for performance and safety. The 6-inch clearance allows for the efficient operation of the furnace and helps prevent any overheating or obstruction of airflow, which can lead to system failures or hazards.

Clearances can vary depending on specific manufacturers and local codes, but unlisted units often have stricter guidelines to accommodate their design and installation standards. Being aware of these requirements is crucial for any HVAC professional to ensure compliance with safety regulations and to optimize the system’s efficiency.

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24 inches

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