AHRI Announces Revision of Standard 880 to Include End Reflection Loss

June 20, 2012
Sean Lynch, Communications Specialist
Direct: (703)600-0371

Arlington, Va.— The Air-Conditioning, Heating, and Refrigeration Institute (AHRI) today announced the revision of AHRI Standard 880, Performance Rating of Air Terminals, to include end reflection loss (ERL) to better predict sound generated by air terminal units. End reflection is the sound energy that is reflected back into the duct during testing instead of entering the test reverberation room, and occurs due to the test setup. The revised standard is now being used in test procedures for the Variable Air Volume Terminals certification program.

“The updated standard makes testing procedures consistent with AHRI products,” said Stephen Yurek, AHRI’s President and CEO. “It will allow for greater accuracy when measuring the noise levels of the units, and improves testing procedures overall.”

Actual room noise levels measured in the field are not affected by this change. This change in the rating procedure and subsequent reporting may increase the resultant discharge noise criteria (NC) level in some cases with duct end reflection corrections applied. Certification ratings can be viewed in AHRI Directory. Further details are available in the ASHRAE Journal article co-authored by AHRI Air Control and Distribution Devices (ACDD) Section Chairman David John.

About AHRI

The Air-Conditioning, Heating, and Refrigeration Institute (AHRI) is the trade association representing manufacturers of air conditioning, heating, commercial refrigeration, and water heating equipment. An internationally recognized advocate for the industry, AHRI develops standards for and certifies the performance of many of these products. AHRI’s 309 member companies manufacture quality, efficient, and innovative residential and commercial air conditioning, space heating, water heating, and commercial refrigeration equipment and components for sale in North America and around the world.