Gas Heat ESCO Practice Exam

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What device can be used to measure gas flow to a natural gas furnace?

Manometer
Thermometer
Gas meter
Barometer

The correct answer is: Gas meter

A manometer is used to measure pressure, not gas flow. A thermometer is used to measure temperature, not gas flow. A barometer is used to measure atmospheric pressure, not gas flow. The gas meter is the correct choice as it is specifically designed to measure the flow of gas to a furnace.