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TRG-TRC007-EN 47
notes
period four
Equipment Sound Rating
As explained in Period One, sound pressure can be directly measured,
however, sound power cannot. Because sound pressure is influenced by the
surroundings, the most accurate sound data that can be provided for a piece of
equipment is sound power.
Sound-power levels are determined by measuring sound-pressure levels in an
environment with known acoustical characteristics, and adding back any effects
attributed to the surroundings.
period four
Equipment Sound Rating
Fundamentals of HVAC Acoustics
Figure 52