NATE Gas Heating Practice Exam

For a natural gas furnace, the correct gas pressure setting at the burners is typically around 3.5 inches of water column. This setting ensures that the furnace operates efficiently and safely, providing the necessary fuel supply for optimal combustion. Setting the gas pressure to 3.5 inches allows the burners to achieve the correct air-to-fuel ratio, contributing to effective heating and minimizing the risk of incomplete combustion, which can lead to the production of harmful carbon monoxide. It is essential to have the pressure calibrated correctly to maintain both performance and safety in gas heating systems, and this standard measurement aligns with industry practices for natural gas appliances. In contrast, the other pressure settings of 2 inches, 10 inches, and 11 inches are either too low or too high for typical residential natural gas furnace applications. Using incorrect pressure settings can lead to inefficient operation, safety hazards, and potential failure of the furnace components.