How can gas flow volume to a natural gas furnace be checked?

The gas flow volume to a natural gas furnace can be accurately checked using the gas meter installed at the site. Gas meters are specifically designed to measure the volume of gas that flows through them, providing a reliable indication of how much gas is being delivered to the furnace. By observing the meter's readings, technicians can assess whether the supply of gas is sufficient for the furnace's operation.

Measuring temperature rise, while useful for diagnosing furnace performance, does not provide direct information about gas flow volume. A pressure gauge can help determine the pressure of the gas entering the furnace, which is important for combustion efficiency, but it does not quantify the actual volume of gas. Visual inspection can reveal issues such as leaks or blockages, but it cannot provide a numerical measurement of gas flow. Thus, using the gas meter is the most precise method to check gas flow volume, making it the correct choice.