air-balancing damper, primary-air nozzles, secondary coils, and discharge
stack.
2.6.1
Sound Power Levels (Reference; 10 to the Power of -12 Watts)
**************************************************************************
NOTE: Delete irrelevant information on sound power
level.
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ANSI S12.33.
Sound power level (dB) shall not exceed the following values:
Sound Power Level, (dB)
____________________________________________________________________________
Octave Band
3
4
5
6
7
____________________________________________________________________________
Center-frequencies (Hz)
250
500
1000 2000 4000
____________________________________________________________________________
a.
Offices, Class Rooms,
51
49
45
44
41
b.
Libraries, Hospital Rooms,
Conference Rooms,
Communication Facilities
49
46
43
41
41
c.
Shops, Mess Halls, Factories
65
61
59
57
55
2.6.2
Enclosures
[Exposed] [Concealed] [floor (free-standing)] [ceiling], [wall-] type.
Construct enclosures of minimum 18 gage galvanized steel or cold-rolled
steel with baked prime finish. Provide [fixed] [adjustable] discharge and
return-air metal grilles and access doors.
2.6.3
Water Coils and Drain Pans
2.6.3.1
Water Coils
ARI 410; seamless copper tubes mechanically bonded to aluminum fins. Each
coil shall be tested at the factory under water at minimum 2068 kPa 300 psi
air pressure and shall be suitable for 1379 kPa 200 psi working pressure.
2.6.3.2
Drain Pans
Galvanized steel pans. Insulate pans with water impervious insulation of
sufficient thickness to prevent condensate formation on the exterior at
ambient conditions to be encountered.
2.6.4
Permanent Filters or Lint Screens
Room air-induction unit manufacturer's standard.
2.6.5
Primary-Air Plenums
Minimum 24 gage galvanized steel, interior acoustically baffled and lined
with sound absorbing materials of manufacturer's standard. Provide a
SECTION 15720N
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