conditioning and refrigeration machinery, such as fans, boilers,
valves, engines, turbines, or transformers. Measure the sound
pressure levels around mechanical and electrical machinery located
in equipment spaces, one meter 3 feet horizontally from the edge
closest to the acoustical center of the machinery at points one
meter and 1.68 meter 3 feet and 5.5 feet above floor. Take
measurements at the center of each side of the machinery. Locate
the microphone at least one meter 3 feet from the observer and
measuring instruments. Observer shall not be between the
machinery and the measuring instrument.
b.
Exterior Machinery Sound
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NOTE: ARI 370 is applicable only for outdoor
refrigerating and air-conditioning equipment.
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Measure sound data [in accordance with ARI 370] for machinery
radiating noise outside the building in such applications as grade
installations, area-ways, wall and roof installations for cooling
towers, refrigerant condensers, engine driven generator sets,
fans, air conditioning machinery, heat pumps, evaporative coolers,
exhaust silencers, and air intakes.
-- End of Section --
SECTION 15070N
Page 59
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