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66 TRG-TRC007-EN
notes
period five
Review
Period Four introduced two common methods used by HVAC equipment
manufacturers to provide accurate sound data. Because sound pressure is
influenced by the surroundings, the most useful sound data that can be
provided for most pieces 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. The most common method uses a special
acoustical testing facility called a reverberant room.
The availability of accurate, tested sound data for HVAC equipment is vitally
important to any acoustical analysis. ARI Standard 260–2001 is one example
of an industry standard for rating the sound level of equipment. This standard
addresses a wide range of air-handling equipment with a consistent test
method. It assures accurate, verifiable sound data, and focuses on the entire
air handler in all of its common installation arrangements. As with other
existing sound standards, ARI 260 enables designers to make equitable product
comparisons and to more accurately predict sound levels for occupied spaces.
Review—Period Four
Figure 72