AMCA International inmotion Magazine - Fall 2011 - (Page 13)
Figure 4: AMCA Certified Rating Program seals for air performance and FEG.
efficiency. With more shaft power being converted to usable aerodynamic power, less power is wasted creating heat and unwanted sound. For this reason, a fan with a higher FEG rating will generally have lower sound levels, all else being the same. Second, fan sound varies considerably along a fan curve. Generally speaking, the most efficient part of the fan curve coincides with the quietest operation of the fan. As the operating point moves up or down the fan curve, sound is typically increased. By requiring the fan selection to be within 10 points of the peak fan efficiency, the louder parts of the fan curve are avoided altogether.
Where do I find FEG ratings? Because the AMCA 211 standard was only recently updated to include the FEG certification program, there are no “certified” FEG ratings at this time. However, FEG ratings can be calculated from other fan performance data, as described above. Over time, FEG ratings will be included in manufacturers’ catalogs, software, and data sheets. Fans that have FEG ratings will display a green AMCA certified rating seal; AMCA-certified fans that do not have an FEG rating will display a blue certified ratings seal (Figure 4). There are three different types of certified FEG ratings, each with a distinct seal. The generic “FEG” seal, shown in Figure 4, can be used in a catalog when not all sizes in a licensed product line are “FEG” certified. If all sizes are “FEG” certified, then either the “Sound, Air Performance and FEG” or “Air Performance and FEG” seals may be used in the catalog.
Suggested Reading
The following articles are available at www.amca.org/feg: “The Role of Fan Efficiency in Reducing HVAC Energy Consumption,” by Michael Brendel, PhD. AMCA inmotion, April 2010. “Fan Industry Meeting Energy Challenges,” by Joe Brooks, PE; John Cermak, PhD, PE; and John Murphy, PhD. AMCA inmotion, April 2009. “Select Fans Using Fan Total Pressure to Save Energy,” by John Cermak, PhD, PEng; and John Murphy, PhD. ASHRAE Journal July 2011. “New Fan Standard for Energy Efficiency,” by Mike Duggan. ISO Focus, October 2009. Note: Pertains to ISO 12759 and FMEG.
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Table of Contents for the Digital Edition of AMCA International inmotion Magazine - Fall 2011
AMCA International inmotion Magazine - Fall 2011
President’s Message
News
Code Watch
Fan Efficiency Grades: Answers to Frequently Asked Questions
Fans and Atrium Smoke Control
Fire Dampers and Smoke Dampers: The Difference is Important
Fan and Damper Guide Specs Update
Calendar
AMCA International inmotion Magazine - Fall 2011
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