AHRI 261 (SI/2017): Sound Rating of Ducted Air Moving and Conditioning Equipment
This standard applies to Ducted Equipment containing fans and specifies methods for determining the sound power ratings, using sound data for rating the various product Sound Components across the operating range. Mapped Sound Ratings reported are octave-band Sound Power Levels from 63 Hz to 8,000 Hz. In addition to the stated octave band Mapped Sound Ratings, this standard can additionally be used to provide one-third octave band Mapped Sound Ratings from 50 to 10,000 Hz.
© 2017, by Air-Conditioning, Heating, and Refrigeration Institute