Engineering Manual
145
Sound pressure level
Multi-Position
NC curves
10.0
15.0
20.0
25.0
30.0
35.0
40.0
45.0
50.0
55.0
60.0
65.0
70.0
NC-60
NC-50
Approximate minimum
audible limit on
continuous noise
NC-40
Octave band center frequencies (Hz)
NC-20
NC-30
High
Middle
Low
10.0
15.0
20.0
25.0
30.0
35.0
40.0
45.0
50.0
55.0
60.0
65.0
70.0
63 125250 5001k
NC-60
NC-50
Approximate minimum
audible limit on
continuous noise
NC-40
Octav
NC-20
NC-30
High
Middle
Low
10.0
15.0
20.0
25.0
30.0
35.0
40.0
45.0
50.0
55.0
60.0
65.0
70.0
63 125250
NC-60
NC-50
5001k2k
Approximate minimum
audible limit on
continuous noise
NC-40
Octave band center frequencies (Hz)
NC-20
NC-30
High
Middle
Low
10.0
15.0
20.0
25.0
30.0
35.0
40.0
45.0
50.0
55.0
60.0
65.0
70.0
63 125250 5001k2k4k8k
NC-60
NC-50
NC-40
Octave band center frequencies (Hz)
NC-20
NC-30
High
Middle
Low
10.0
15.0
20.0
25.0
30.0
35.0
40.0
45.0
50.0
55.0
60.0
65.0
70.0
63 125250 500
NC-60
NC-50
NC-40
Octave band center frequencies (Hz)
NC-20
NC-30
High
Middle
Low
10.0
15.0
20.0
25.0
30.0
35.0
40.0
45.0
50.0
55.0
60.0
65.0
70.0
63 125250 5001k2k4k8k
NC-60
NC-50
NC-40
Octave band center frequencies (Hz)
NC-20
NC-30
High
Middle
Low
External static pressure 0.30 [in.WG] (75Pa)
External static pressure 0.30 [in.WG] (75Pa)
External static pressure 0.50 [in.WG] (125Pa)
External static pressure 0.80 [in.WG] (200Pa)
External static pressure 0.50 [in.WG] (125Pa)
External static pressure 0.80 [in.WG] (200Pa)
kk8k
e band center frequencies (Hz)
24
4k 8k
Approximate minimum
audible limit on
continuous noise
Approximate minimum
audible limit on
continuous noise
1k 2k 4k 8k
Approximate minimum
audible limit on
continuous noise
63 125250 5001k2k4k8k
PVA-A12AA7
PVA-A18AA7
10.0
15.0
20.0
25.0
30.0
35.0
40.0
45.0
50.0
55.0
60.0
65.0
70.0
NC-60
NC-50
NC-40
v
NC-20
NC-30
High
Middle
Low
10.0
15.0
20.0
25.0
30.0
35.0
40.0
45.0
50.0
55.0
60.0
65.0
70.0
NC-60
NC-50
Approximate minimum
audible limit on
continuous noise
NC-40
NC-20
NC-30
High
Middle
Low
15.0
20.0
25.0
30.0
35.0
40.0
45.0
50.0
55.0
60.0
65.0
70.0
NC-60
NC-50
NC-40
NC-20
NC-30
High
Middle
Low
10.0
15.0
20.0
25.0
30.0
35.0
40.0
45.0
50.0
55.0
60.0
65.0
70.0
NC-60
NC-50
NC-40
NC-20
NC-30
High
Middle
Low
0.0
5.0
15.0
20.0
25.0
30.0
35.0
40.0
45.0
50.0
55.0
60.0
65.0
70.0
NC-60
NC-50
NC-40
NC-20
NC-30
High
Middle
Low
0.0
5.0
15.0
20.0
25.0
30.0
35.0
40.0
45.0
50.0
55.0
60.0
65.0
70.0
NC-60
NC-50
NC-40
NC-20
NC-30
High
Middle
Low
External static pressure 0.30 [in.WG] (75Pa) External static pressure 0.30 [in.WG] (75Pa)
External static pressure 0.50 [in.WG] (125Pa)
External static pressure 0.80 [in.WG] (200Pa) External static pressure 0.80 [in.WG] (200Pa)
External static pressure 0.50 [in.WG] (125Pa)
4k 8k
63 125250 5001k2k4k8k
Octa e band center frequencies (Hz)
125250 5001k2k
Octave band center frequencies (Hz)
36
Approximate minimum
audible limit on
continuous noise
Approximate minimum
audible limit on
continuous noise
63 125250 5001k2k4k8k
Octave band center frequencies (Hz)
10.010.0
63 125250 5001k2k4k8k
Octave band center frequencies (Hz)
Approximate minimum
audible limit on
continuous noise
Approximate minimum
audible limit on
continuous noise
63 125250 5001k2k4k8k
Octave band center frequencies (Hz)
63 125250 5001k2k4k8k
Octave band center frequencies (Hz)
10.0
Approximate minimum
audible limit on
continuous noise
10.0
15.0
20.0
25.0
30.0
35.0
40.0
45.0
50.0
55.0
60.0
65.0
70.0
NC-60
NC-50
NC-40
v
NC-20
NC-30
High
Middle
Low
10.0
15.0
20.0
25.0
30.0
35.0
40.0
45.0
50.0
55.0
60.0
65.0
70.0
NC-60
NC-50
Approximate minimum
audible limit on
continuous noise
NC-40
NC-20
NC-30
High
Middle
Low
15.0
20.0
25.0
30.0
35.0
40.0
45.0
50.0
55.0
60.0
65.0
70.0
NC-60
NC-50
NC-40
NC-20
NC-30
High
Middle
Low
10.0
15.0
20.0
25.0
30.0
35.0
40.0
45.0
50.0
55.0
60.0
65.0
70.0
NC-60
NC-50
NC-40
NC-20
NC-30
High
Middle
Low
0.0
5.0
15.0
20.0
25.0
30.0
35.0
40.0
45.0
50.0
55.0
60.0
65.0
70.0
NC-60
NC-50
NC-40
NC-20
NC-30
High
Middle
Low
0.0
5.0
15.0
20.0
25.0
30.0
35.0
40.0
45.0
50.0
55.0
60.0
65.0
70.0
NC-60
NC-50
NC-40
NC-20
NC-30
High
Middle
Low
External static pressure 0.30 [in.WG] (75Pa) External static pressure 0.30 [in.WG] (75Pa)
External static pressure 0.50 [in.WG] (125Pa)
External static pressure 0.80 [in.WG] (200Pa) External static pressure 0.80 [in.WG] (200Pa)
External static pressure 0.50 [in.WG] (125Pa)
4k 8k63 125250 5001k2k4k8k
Octa e band center frequencies (Hz)
125250 5001k2k
Octave band center frequencies (Hz)
36
Approximate minimum
audible limit on
continuous noise
Approximate minimum
audible limit on
continuous noise
63 125250 5001k2k4k8k
Octave band center frequencies (Hz)
10.0
10.0
63 125250 5001k2k4k8k
Octave band center frequencies (Hz)
Approximate minimum
audible limit on
continuous noise
Approximate minimum
audible limit on
continuous noise
63 125250 5001k2k4k8k
Octave band center frequencies (Hz)
63 125250 5001k2k4k8k
Octave band center frequencies (Hz)
10.0
Approximate minimum
audible limit on
continuous noise
10.0
15.0
20.0
25.0
30.0
35.0
40.0
45.0
50.0
55.0
60.0
65.0
70.0
NC-60
NC-50
NC-40
v
NC-20
NC-30
High
Middle
Low
10.0
15.0
20.0
25.0
30.0
35.0
40.0
45.0
50.0
55.0
60.0
65.0
70.0
NC-60
NC-50
Approximate minimum
audible limit on
continuous noise
NC-40
NC-20
NC-30
High
Middle
Low
15.0
20.0
25.0
30.0
35.0
40.0
45.0
50.0
55.0
60.0
65.0
70.0
NC-60
NC-50
NC-40
NC-20
NC-30
High
Middle
Low
10.0
15.0
20.0
25.0
30.0
35.0
40.0
45.0
50.0
55.0
60.0
65.0
70.0
NC-60
NC-50
NC-40
NC-20
NC-30
High
Middle
Low
0.0
5.0
15.0
20.0
25.0
30.0
35.0
40.0
45.0
50.0
55.0
60.0
65.0
70.0
NC-60
NC-50
NC-40
NC-20
NC-30
High
Middle
Low
0.0
5.0
15.0
20.0
25.0
30.0
35.0
40.0
45.0
50.0
55.0
60.0
65.0
70.0
NC-60
NC-50
NC-40
NC-20
NC-30
High
Middle
Low
External static pressure 0.30 [in.WG] (75Pa) External static pressure 0.30 [in.WG] (75Pa)
External static pressure 0.50 [in.WG] (125Pa)
External static pressure 0.80 [in.WG] (200Pa) External static pressure 0.80 [in.WG] (200Pa)
External static pressure 0.50 [in.WG] (125Pa)
4k 8k63 125250 5001k2k4k8k
Octa e band center frequencies (Hz)
125250 5001k2k
Octave band center frequencies (Hz)
36
Approximate minimum
audible limit on
continuous noise
Approximate minimum
audible limit on
continuous noise
63 125250 5001k2k4k8k
Octave band center frequencies (Hz)
10.010.0
63 125250 5001k2k4k8k
Octave band center frequencies (Hz)
Approximate minimum
audible limit on
continuous noise
Approximate minimum
audible limit on
continuous noise
63 125250 5001k2k4k8k
Octave band center frequencies (Hz)
63 125250 5001k2k4k8k
Octave band center frequencies (Hz)
10.0
Approximate minimum
audible limit on
continuous noise