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54 TRG-TRC007-EN
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period four
Equipment Sound Rating
HVAC Equipment Sound Rating
As mentioned earlier, because sound pressure is influenced by the
surroundings, often the best way for an equipment manufacturer to provide
sound data is to provide sound-power levels.
Sound-power levels for many types of HVAC equipment are determined in an
acoustics laboratory, usually by the manufacturer. Sound-power levels are
determined by measuring sound-pressure levels in a test facility with known
acoustical characteristics, and adding back any environmental effects attributed
to the surroundings. Formal written standards qualify such test facilities and
methods, in order to promote uniformity of data between different
manufacturers across the industry. This allows for objective comparisons of
similar equipment.
The two most common methods of determining the sound power of HVAC
equipment are the reverberant-room and free-field methods.
Rating HVAC Equipment
Figure 59