TM 5-805-4/AFJMAN 32-1090
Table 5-8. Location "A" Cooling Tower Problem.
Col. 1
Col. 4
Col. 5
Col. 6
Col. 3
Col.
7
Col. 2
Col. 8
Average
Octave
Distance
Sound
NR
Term for
Outdoor
Band
SPL of
Power
Wall
SPL at
Indoor
Center
480 ft
NC-25
Level of
Noise
SPL
Residence
Curve
Distance
Source
Excess
Type B
(dB)
(dB)
(dB)
(Hz)
(dB)
(dB)
(dB)
(dB)
8
48
--
--
108
31
52
56
48
--
63
57
52
9
54
109
44
60
10
112
6
125
52
50
46
11
250
110
57
37
53
9
12
108
43
12
500
31
55
53
1000
12
39
52
27
105
53
13
2000
46
14
24
8
100
32
54
4000
22
23
1
38
15
57
95
--
8000
16
21
60
31
15
91
Table 5-9. Location "B" Cooling Tower Problem
Col. 1
Col. 7
Col. 6
Col. 8
Col. 4
Col. 5
Col. 2
Col. 3
Col. 9
Octave
Barrier
Distance
Average
Sound
Band
NR
Insertion
SPL of
Power
Term for
Outdoor
Center
Wall
Indoor
520 ft.
Loss for
Level of
NC-25
SPL at
Noise
= .23 ft.
Residence
SPL
Source
Distance
Curve
Excess
Type B
(Hz)
(dB)
(dB)
(dB)
(dB)
(dB)
(dB)
(dB)
(dB)
8
31
108
43
52
5
51
63
43
5
9
54
109
52
52
44
44
10
6
112
125
52
54
38
8
110
11
250
37
53
49
34
108
12
500
31
46
53
9
27
1000
11
40
13
27
105
54
18
2000
24
100
14
13
32
55
6
4000
22
16
21
95
15
58
--
8000
16
21
10
62
91
19
5-15
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