AMCA Green Tips for
High-Performance Air Systems

Tip #2: Minimize System Effect in Air Systems

Conventional air-system design processes result in  an ideal fan type, size, and speed for ideal conditions. But in the field, actual conditions are often less than ideal. Obstacles to duct runs lead to sharp turns or changes in elevation, and then another correction to resume the planned path. Or, there might not be enough room for the ideal length of inlet or outlet duct to establish fully developed airflow. The results of less-than-ideal fan conditions are summarily called system effect.

Here are some resources for understanding common causes of system effect. Engineers, duct-installation contractors, and commisioning providers will find this information especially useful.

Resources:

• Technical article: Achieving Optimal Fan Performance, by Mark Stevens, AMCA International, Consulting-Specifying Engineer, December 2011. (no cost)

• AMCA Video: System Effect, online - (no cost)

  • Order the DVD to use as a training tool: System Effect  (US $36)

• PowerPoint PDF: Fan Performance and System Effect, by Mark Stevens, AMCA International, July 2011. 

• Reference manual: AMCA Publication 200 - Air Systems (2011). ($90)

See other AMCA Green Tips for High-Performance Air Systems at our Energy and Green Building Week page supporting ICC Safety Month, May 2012.

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For questions about this page, contact Michael Ivanovich, AMCA International.