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5
SOUND PRESSURE LEVELS
5-1. Sound pressure level
Ceiling concealed
5-2. NC curves
MVZ-A12AA4
External static pressure 0.30 [in.WG] (75Pa)
70.0
65.0
60.0
55.0
50.0
45.0
40.0
35.0
30.0
25.0
20.0
Approximate minimum
audible limit on
5.0
continuous noise
0.0
63
25
250
Octave band center frequencies (Hz)
External static pressure 0.50 [in.WG] ( 25Pa)
70.0
65.0
60.0
55.0
50.0
45.0
40.0
35.0
30.0
25.0
20.0
Approximate minimum
audible limit on
5.0
continuous noise
0.0
63
25
250
Octave band center frequencies (Hz)
External static pressure 0.80 [in.WG] (200Pa)
70.0
65.0
60.0
55.0
50.0
45.0
40.0
35.0
30.0
25.0
20.0
Approximate minimum
5.0
audible limit on
continuous noise
0.0
63
25
250
Octave band center frequencies (Hz)
ux.duct
Front side
3-1/4ft.
(1m)
Measurement location
ux.duct
High
Low
Middle
NC-60
NC-50
NC-40
NC-30
NC-20
500
k
2k
4k
8k
High
Low
Middle
NC-60
NC-50
NC-40
NC-30
NC-20
500
k
2k
4k
8k
High
Low
Middle
NC-60
NC-50
NC-40
NC-30
NC-20
500
k
2k
4k
8k
MVZ-A18AA4
External static pressure 0.30 [in.WG] (75Pa)
70.0
65.0
60.0
55.0
50.0
45.0
40.0
35.0
30.0
25.0
20.0
Approximate minimum
audible limit on
5.0
continuous noise
0.0
63
25
250
500
Octav
e band center frequencies (Hz)
External static pressure 0.50 [in.WG] ( 25Pa)
70.0
65.0
60.0
55.0
50.0
45.0
40.0
35.0
30.0
25.0
20.0
Approximate minimum
5.0
audible limit on
continuous noise
0.0
63
25
250
500
Octave band center frequencies (Hz)
External static pressure 0.80 [in.WG] (200Pa)
70.0
65.0
60.0
55.0
50.0
45.0
40.0
35.0
30.0
25.0
20.0
Approximate minimum
5.0
audible limit on
continuous noise
0.0
63
25
250
500
Octave band center frequencies (Hz)
12
High
Low
Middle
NC-60
NC-50
NC-40
NC-30
NC-20
k
2
k
4
k
8k
High
Low
Middle
NC-60
NC-50
NC-40
NC-30
NC-20
k
2k
4k
8k
High
Low
Middle
NC-60
NC-50
NC-40
NC-30
NC-20
k
2k
4k
8k
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