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Why is inches of water column used to measure gas pressure instead of psig?

A. It is a more precise measurement.
B. Gas manifold pressures are too small for accurate measurement in PSI.
C. Gas pressures must be accurately set for correct operation.
D. All of the above.

Answer :

The correct answer is C. Gas pressures must be accurately set for correct operation.Inches of water column (inH2O) is a commonly used unit of measurement for gas pressure.

PSI (pounds per square inch) is a commonly used unit of measurement for gas pressure as well, but it may not provide the necessary accuracy for low gas pressures, such as those used in residential and commercial heating and cooling applications.Accurate gas pressure is critical to ensure the proper operation of gas appliances, such as furnaces and boilers, and to prevent potential safety hazards, such as gas leaks and carbon monoxide poisoning. Therefore, it is important to use a unit of measurement that can accurately measure gas pressure, such as inches of water column.

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