G2 Gas Fitter Practice Exam 2025 - Free Gas Fitter Practice Questions and Study Guide

A residential central forced air gas furnace heating system operates by drawing in air from the home, heating that air, and then circulating it back throughout the living space. The furnace uses natural gas as its energy source to ignite a burner, which heats a heat exchanger. The heated air is then drawn into the duct system using a blower and distributed through vents in various rooms.

This process ensures that the air within the home is continuously cycled and kept at a comfortable temperature. The system is designed to efficiently manage the flow of warm air and maintain a consistent indoor climate, making it an effective heating solution for residential spaces.

Other options do not accurately describe the function of a central forced air gas furnace. For instance, cycling air through a heat pump or utilizing radiant heating panels reflect different heating technologies that do not involve the direct heat exchange process typical of gas furnaces. Additionally, returning cold air through ducts does not align with how a forced air system operates, as it focuses on distributing warm air rather than returning cold air.