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16
SOUND POWER LEVEL
Frequency (Hz)
125
250
500
1000
2000
4000
8000
•
AMCA 320 -07 Laboratory Methods of Sound
Testing of Fans Using Sound Intensity
•
Tests conducted in accordance with this
standard.
•
Free field measurement plane created 1 foot
from unit on Supply, Return side and Top.
•
Reference acoustic intensity:
0dB = 10E-
6μW/m
2
•
A-Weighted Sound Power was determined
using AMCA standard 301-90 Clause 9.1
Measured (dB)
3,000 CFM / 1in.Wg
90.8
86.4
80.8
78.5
76.1
70.9
68.4
20
30
40
50
60
70
80
90
100
125
250
500
1000
2000
4000
8000
So
u
n
d
Po
w
e
r
L
e
ve
l
(0
d
B
=
1
0
E
-6
μ
W
/m
2
)
Octave Band Center Frequency (Hz)
NR-70
NR-65
NR-60
NR-55
NR-50
NR-45
NR-40
NR-35
NR-30
NR-75
NR-80
NR-85
NR-90
