Gas Fitter Practice Test 2025 – The All-in-One Guide to Mastering Your Certification!

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Question: 1 / 455

What does a spiral baffle do?

Remove flue gas

Speed up combustion

Slow flue gas

A spiral baffle is designed to slow down the velocity of flue gas as it moves through a flue gas duct or chimney. By creating a spiral flow path, the baffle increases the contact time of the flue gases with the heating surface, thereby promoting better heat exchange and improving efficiency. This design contributes to more effective heat recovery by allowing the gases to cool gradually, which can help in maximizing energy use and reducing emissions.

In the context of gas fitting and heating systems, understanding the role of components like spiral baffles is essential for optimizing system performance and compliance with regulations. The other options focus on actions like removing flue gas, speeding up combustion, or raising temperatures, which do not accurately reflect the function of a spiral baffle.

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Raises flue temperature

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