NATE Gas Heating Practice Exam 2025 - Free Gas Heating Practice Questions and Study Guide

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What can restrict airflow in a gas furnace, potentially leading to overheating?

Excessive dust buildup

Excessive dust buildup can indeed restrict airflow in a gas furnace, which may lead to overheating. A clean and unobstructed airflow is essential for the efficient operation of the furnace; however, when dust accumulates in air filters, ducts, or around the furnace components, it can impede the airflow. This restriction reduces the ability of the furnace to draw in necessary air for combustion and circulation, causing the heat exchanger to overheat due to insufficient air supply.

While improper venting and cold ambient temperatures can also impact the performance of a gas furnace, they relate to different operational issues. Improper venting can cause inadequate exhaust of combustion gases, leading to safety hazards. Cold ambient temperatures do not directly restrict airflow but instead affect the thermal dynamics of how the furnace operates. However, excessive dust buildup specifically targets airflow restriction directly due to physical obstruction.

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Improper venting

Cold ambient temperatures

All of the above

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