What is equivalent to 28" W.C.?

To understand the equivalent of 28" W.C. (inches of water column), it's important to recognize that this measurement is a unit of pressure. Specifically, water column pressure is often used in various applications, including gas appliances and HVAC systems.

28" W.C. translates to a certain pressure in psi (pounds per square inch). The conversion factor typically used is that 1 inch of water column is equal to approximately 0.0361 psi.

When performing the calculation:

28" W.C. × 0.0361 psi/inch = 1.009 psi, which is effectively 1 psig (pounds per square inch gauge pressure) since gauge pressure is a measure relative to atmospheric pressure.

Gauge pressure does not include atmospheric pressure, whereas absolute pressure (psia) does. Therefore, the equivalent answer for 28" W.C. as 1 psig aligns with the measurement's context in gas pressure regulation and device calibrations.

Understanding this conversion allows individuals to better interpret and correlate pressure measurements commonly encountered in the field.