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TRG-TRC013-EN iii
Contents
Introduction ........................................................... 1
period one Fan Performance .................................................. 2
Fan Performance Curves ....................................... 11
System Resistance Curve ...................................... 17
Fan – System Interaction ....................................... 19
period two Fan Types .............................................................. 27
Forward Curved (FC) Fans ..................................... 28
Backward Inclined (BI) Fans ................................... 30
Airfoil (AF) Fans ..................................................... 33
Vaneaxial Fans ...................................................... 35
period three Fan Capacity Control ......................................... 39
“Riding the Fan Curve” ......................................... 40
Discharge Dampers ............................................... 44
Inlet Vanes ............................................................ 46
Fan-Speed Control ................................................. 48
Variable-Pitch Blade Control ................................... 49
period four Application Considerations ............................. 52
System Static-Pressure Control ............................. 53
System Effect ....................................................... 55
Acoustics .............................................................. 56
Effect of Actual (Nonstandard) Conditions .............. 58
Equipment Certification Standards ......................... 59
period five Review ................................................................... 60
Quiz ......................................................................... 64
Answers ................................................................ 66
Glossary ................................................................ 67