Gas Heat ESCO Practice Exam

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A typical vent stack temperature on a NATURAL DRAFT furnace is:

250 F - 350 F
350 F - 450 F
450 F - 550 F
150 F - 250 F

The correct answer is: 350 F - 450 F

The typical vent stack temperature for a natural draft furnace generally falls within the range of 350 F to 450 F. This temperature range is crucial because it reflects the heat produced during combustion and the efficiency of the venting system in maintaining adequate airflow and draft to safely expel exhaust gases. Natural draft furnaces rely on the principle of buoyancy to create a draft, which can sometimes result in higher stack temperatures compared to forced air systems. Stacking temperatures outside of this range might indicate issues with the system's efficiency, such as inadequate air supply or poor draft, potentially leading to higher gas consumption or increased safety concerns. Understanding the normal operating temperature is essential for technicians in diagnosing performance and maintenance requirements effectively, ensuring safe and efficient operation of the furnace.