Consulting-Specifying Engineer, Nov. 2016, by Wade W. Smith.
http://www.csemag.com/single-article/understanding-the-fan-efficiency-rules/f6487a0a905b99d5c6ff3dfdbf3f9d0c.html

"Fan efficiency is critical in HVAC and process air systems. The new proposed Department of Energy standard will drive changes in how engineers design air systems to minimize fan energy."