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Fan Performance Testing

- What is it?
The measurement of fan-system performance.  A measure of flow rate and pressure at a stated density and fan speed.  Flow is typically stated as cfm (cubic feet per minute), pressure as in. wg (inches water gauge).

- Why test a fan-system?
No two fan-systems are alike.  Fan performance ratings are developed from laboratory tests.  However, add the duct work, elbows, transitions, filters, dampers, etc., and the system becomes unique.  On-site testing is requied to assure that the system performance meets the design specifications.  Performance results are used as the basis for modifications or adjustments to the system.