NATE Gas Heating Practice Exam

What device is typically used to regulate the flow of gas in a furnace?

1. Thermostat

2. Blower motor

3. Gas valve

4. Inducer fan

The correct answer is: Gas valve

A gas valve is the device typically used to regulate the flow of gas in a furnace. It controls the amount of gas that enters the combustion chamber, ensuring that the furnace receives the appropriate amount of fuel for efficient operation. The gas valve can open and close in response to signals from the thermostat or other control systems, allowing for precise regulation of gas flow based on the heating needs of the space. In contrast, a thermostat is primarily responsible for sensing the temperature and signaling the heating system to start or stop, but it does not directly control gas flow. The blower motor is involved in circulating air throughout the heating system but has no role in regulating gas. The inducer fan assists with venting combustion gases and improving efficiency but also does not manage gas flow. The gas valve is critical for ensuring safe operation and maintaining proper combustion within the furnace.