Gas Fitter Practice Test 2026 – The All-in-One Guide to Mastering Your Certification!

Question: 1 / 455

What does the stack effect refer to?

Air flow through the appliance

Negative building pressure

Warm air will rise

The stack effect refers to the phenomenon where warm air rises due to its lower density compared to cooler air. As air warms up, it becomes lighter and rises, leading to a reduction in pressure at the lower levels of a building. This can create a natural airflow, drawing in cooler air from outside or from lower levels to replace the rising warm air. Understanding the stack effect is crucial for gas fitters and HVAC professionals, as it influences indoor air quality, energy efficiency, and the overall comfort of a space.

The other options touch on related concepts but do not capture the essence of the stack effect, which is primarily about the movement of warm air within a structure.

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External building envelope

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