a.
All HVAC mechanical rooms, including machinery spaces and other
spaces containing HVAC power drivers and power driven equipment.
b.
All spaces sharing a common barrier with each mechanical room,
including rooms overhead, rooms on the other side of side walls,
and rooms beneath the mechanical room floor.
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NOTE: The designer/specifier shall select
representative non-mechanical rooms which are
occupied by any personnel and are served by each
type of primary HVAC air moving system and HVAC
water moving systems. Include rooms served by like
primary systems which have significantly different
sound affecting configurations. List, in the
subparagraphs below, the rooms to be sound measured
that will accomplish the aforementioned sound
assessment philosophy. List the rooms by
terminology identical to labeling indicated on
drawings.
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[c.
AHU No. 1 System:
Rooms: [_____]]
[d.
[_____] System:
Rooms: [_____]]
[e.
[_____] System:
Rooms:
[_____]]
3.2.5.2
Procedure
At the time the sound level is measured, each room shall be unoccupied,
except for TAB team, and all HVAC systems that would cause noise in the
room shall be operating in their noisiest mode. Record the sound level
(dB) in each octave band. Attempt to mitigate the sound level and bring
the level to within the specified ASHRAE HA noise criteria goals, if such
mitigation is within the TAB team's control. State in the report the
ASHRAE HA noise criteria goals. If sound level cannot be brought into
compliance, provide written notice of the deficiency to the Contractor for
resolution or correction.
3.2.5.3
Timing
Sound levels shall be measured at times prescribed by AABC or NEBB.
3.2.5.4
Meters
Measure sound levels with a sound meter complying with ANSI S1.4, Type 1 or
2, and an octave band filter set complying with ANSI S1.11. Measurement
methods for overall sound levels and for octave band sound levels shall be
as prescribed by NEBB.
3.2.5.5
Sound levels shall be calibrated as prescribed by AABC or NEBB except that
calibrators emitting a sound pressure level tone of 94 dB at 1000 hertz
(Hz) are also acceptable.
SECTION 15950N
Page 27
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