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TCF220 Fan Affinity Laws (TCF220)


The performance of a fan is defined by the flow, fan pressure, and power draw of the fan. The fan affinity laws (also called the fan laws for short) are a set of inter-related equations that predict the performance of the fan under varying designs and conditions. For example, from a fan applications perspective some fan laws dictate how the performance of the fan will vary if we change the density, or the rotational speed of the fan. From a fan design perspective other fan laws can predict the change in performance due to changes in impeller diameter or size. Yet another will predict the change in the noise generated by the fan.
In this introductory self-guided fan applications engineering course, you will apply a simplified set of affinity laws to predict fan performance changes due to changes in rotational speed and changes in density compared to published catalog performance. In this course changes to the compressibility factor are not taken into consideration. See FSO225 Advanced Affinity Laws for high-pressure systems where the compressibility factor cannot be ignored.

  • Includes pdf course notes that are handy for future reference, and make it easier for you to follow along, especially if English is not your first language
  • Includes IP - SI spreadsheet calculator for unit conversion
  • You can leave the course and the system will save your progress for when you come back, but you must finish within 30 days of enrolling
  • Explore or re-visit topics in the sequence you desire
  • Learning activities and quiz questions keep you engaged in the topics
  • SI units only
  • Allow at least 45 minutes in your schedule for completing this course
  • After passing the course, you can print a certificate of completion for your employer
  • For multi-person or multi-course discounts, email info@productiveenergy.com
  • FSO220 Fan Affinity Laws
Completion rules
  • All units must be completed