This standard applies to products rated in the 63 Hz Octave Band (50, 63 and 80 Hz One-Third Octave Bands) where the sound power is determined from measurements made in a reverberation room by using the comparison method as specified per ANSI/ASA Standard S12.51/ISO: 3741.
ANSI/AHRI 280-2012 history
2012ANSI/AHRI 280-2012 Requirements for the Qualification of Reverberation Rooms in the 63 Hz Octave Band