'NATE Gas & Oil Forced-Air and Hot-Water Heating Systems Practice Test 2025 – The Comprehensive All-in-One Guide to Exam Success!'

The orifice is the correct component located in the gas manifold that distributes gas to each burner. In a heating system, the gas manifold functions as the central hub through which gas is supplied to various burners, and the orifice plays a crucial role in this process. It is designed to control the flow of gas, ensuring that the right amount reaches each burner for optimal combustion. The size and design of the orifice directly affect the gas pressure and flow rate, which are vital for maintaining the efficiency and safety of the heating system.

Other components, such as valves, filters, and regulators, serve different purposes within a heating system. While valves may control the on/off function of gas to the manifold or individual burners, and filters are used to remove impurities from the gas before it reaches the combustion chamber, they do not directly distribute the gas to the burners. Regulators, on the other hand, regulate pressure but are not the components that facilitate the direct distribution of gas to each burner. The orifice specifically allows the precise delivery of fuel necessary for reliable and efficient heating.