How to Choose the Right Exhaust Fan - Grainger KnowHow
2018-2-19 · Fan static pressure is measured in inches of water gauge. One pound per square inch is equivalent to 27.7” SP. Static pressure in fan systems is typically less than 2” SP, or 0.072 Psi. The Exhaust Fan drawing below illustrates how static pressures are measured in ductwork with a manometer. A pressure differential between the duct and the ...
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