ARLINGTON, Va. — The Air-Conditioning, Heating, and Refrigeration Institute (AHRI) 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. It occurs due to the test setup. The revised standard is now being used in test procedures for the variable air volume terminals certification program.