Single Deflector Grille

Identification
* NF/LAG/SDG

42

42

NOM. +

NOM. DUCT

51

19

32

Characteristic
* Construction in Aluminium / Galvanized
NF/LAG/SDG-H

NF/LAG/SDG-V

Finished Standard
* Exposed Faces: Matt White / Confirmed
Finished Colour / Anodized

PRODUCT INFORMATION

NF/LAG/SDG-H is a adjustable single deflection for sidewall / ceiling installation with standard one
set of blades constructed in horizontal.
Vertical blades construction can be requested, NF/LAG/SDG-V.
The single deflector may be designed to suit for curve face with vertical blades only.

NAM FOONG (M) SDN BHD (8070-T)

Category

Neck
Area

0.014 m2

Category

Neck
Area

0.020 m2

Category

Neck
Area

0.033 m2

Category

Neck
Area

0.048 m2

Neck
Velocity
[m/s]
3
3.5
4
4.5
5
5.5
6
7
8
9
10
11

Flow
[I/s]

Neck
Velocity
[m/s]
3
3.5
4
4.5
5
5.5
6
7
8
9
10
11

Flow
[I/s]

Neck
Velocity
[m/s]
2.5
3
3.5
4
4.5
5
5.5
6.5
7.5
8.5
9.5
10.5

Flow
[I/s]

Neck
Velocity
[m/s]
2
2.5
3
3.5
4
4.5
5
5.5
6
7
8
9

Flow
[I/s]

42
49
56
63
70
77
84
98
112
126
140
154

61
71
81
91
101
111
121
142
162
182
202
222

82
99
115
132
148
165
181
214
247
280
313
346

97
121
145
169
193
217
241
266
290
338
386
435

Pressure
Drop
[Pa]
25
32
40
49
58
67
77
99
122
148
175
204

Throw
(0.25m/s)
[m]
3
4
6
8
10
12
>12
>12
>12
>12
>12
>12

Pressure
Drop
[Pa]
25
32
40
49
58
67
77
99
122
148
175
204

Throw
(0.25m/s)
[m]
4
6
8
10
13
>13
>13
>13
>13
>13
>13
>13

Pressure
Drop
[Pa]
19
25
32
40
49
58
67
88
110
135
161
189

Throw
(0.25m/s)
[m]
3
6
9
12
15
>15
>15
>15
>15
>15
>15
>15

Pressure
Drop
[Pa]
13
19
25
32
40
49
58
67
77
99
122
148

Throw
(0.25m/s)
[m]
2
5
9
12
16
>16
>16
>16
>16
>16
>16
>16

Single Deflection

250
29.0
32.8
36.0
38.9
41.5
43.8
45.9
49.7
52.9
55.8
58.4
60.7

Sound Power Level, dB re 1E-12W

Octave Band Centre Frequency (Hz)
500
1000
2000
24.0
11.2
27.7
16.5
5.6
31.0
21.2
10.9
33.8
25.3
15.5
36.4
29.0
19.6
38.7
32.3
23.4
40.8
35.4
26.8
44.5
40.7
32.9
47.8
45.4
38.1
50.6
49.5
42.8
53.2
53.2
46.9
55.5
56.5
50.6

4000
5.7
10.3
14.4
18.1
21.5
27.5
32.7
37.3
41.4
45.1

8000
7.8
11.2
14.3
17.2
22.2
26.6
30.5
33.9
37.0

250
31.2
34.9
38.2
41.0
43.6
45.9
48.1
51.8
55.1
57.9
60.5
62.8

Sound Power Level, dB re 1E-12W

Octave Band Centre Frequency (Hz)
500
1000
2000
26.4
14.4
30.1
19.8
9.4
33.3
24.4
14.7
36.2
28.5
19.3
38.8
32.2
23.5
41.1
35.5
27.2
43.2
38.6
30.6
46.9
44.0
36.7
50.2
48.6
41.9
53.0
52.7
46.6
55.6
56.4
50.7
57.9
59.7
54.5

4000
9.3
13.8
18.0
21.7
25.1
31.1
36.3
40.8
45.0
48.7

8000
6.7
10.5
14.0
17.1
19.9
25.0
29.3
33.2
36.6
39.8

250
29.6
34.0
37.8
41.0
43.9
46.5
48.8
52.9
56.3
59.4
62.1
64.5

Sound Power Level, dB re 1E-12W

Octave Band Centre Frequency (Hz)
500
1000
2000
25.1
12.3
29.6
18.7
8.5
33.3
24.1
14.6
36.6
28.7
19.8
39.4
32.8
24.4
42.0
36.5
28.6
44.3
39.9
32.2
48.3
45.7
38.9
51.8
50.7
44.5
54.9
55.0
49.4
57.6
58.9
53.8
60.0
62.4
57.7

4000
8.9
14.1
18.7
22.8
26.5
33.0
38.6
43.4
47.8
51.7

8000
6.0
10.4
14.2
17.7
20.8
26.2
30.9
35.0
38.7
41.9

250
26.4
31.8
36.2
40.0
43.3
46.1
48.7
51.0
53.1
56.9
60.1
63.0

Sound Power Level, dB re 1E-12W

Octave Band Centre Frequency (Hz)
500
1000
2000
22.2
7.9
27.6
15.7
5.3
32.1
22.1
12.5
35.8
27.4
18.5
39.1
32.1
23.8
41.9
36.2
28.4
44.5
39.9
32.6
46.8
43.2
36.3
48.9
46.3
39.7
52.6
51.6
45.8
55.9
56.3
51.0
58.7
60.4
55.7

4000
6.6
12.6
17.8
22.4
26.5
30.2
33.6
39.6
44.8
49.4

8000
8.9
13.2
17.1
20.5
23.7
26.5
31.5
35.9
39.8

NR
9
13
17
20
22
25
27
31
35
40
43
47

125
36.0
39.1
41.7
44.0
46.1
48.0
49.7
52.8
55.5
57.8
59.9
61.8

NR
12
16
19
22
25
27
29
34
39
43
46
50

125
38.0
41.0
43.7
46.0
48.1
50.0
51.7
54.8
57.4
59.8
61.8
63.7

NR
11
15
19
22
25
28
30
36
41
45
49
52

125
37.0
40.6
43.6
46.3
48.6
50.7
52.6
55.9
58.8
61.2
63.5
65.4

NR
8
13
18
22
25
28
30
33
36
42
46
50

125
34.6
39.0
42.6
45.7
48.3
50.7
52.8
54.7
56.4
59.4
62.1
64.4

NAM FOONG (M) SDN BHD (8070-T)

Category

Neck
Area

0.066 m2

Category

Neck
Area

0.087 m2

Category

Neck
Area

0.109 m2

Category

Neck
Area

0.135 m2

Neck
Velocity
[m/s]
2
2.5
3
3.5
4
4.5
5
5.5
6
7
8
9

Flow
[I/s]

Neck
Velocity
[m/s]
2
2.5
3
3.5
4
4.5
5
5.5
6
6.5
7
8

Flow
[I/s]

Neck
Velocity
[m/s]
2
2.5
3
3.5
4
4.5
5
5.5
6
6.5
7
8

Flow
[I/s]

Neck
Velocity
[m/s]
2
2.5
3
3.5
4
4.5
5
5.5
6
6.5
7
8

Flow
[I/s]

133
167
200
233
267
300
333
367
400
466
533
600

174
217
261
304
348
391
435
478
522
565
609
696

219
273
328
383
437
492
547
601
656
711
765
875

270
337
404
472
539
607
674
742
809
876
944
1079

Pressure
Drop
[Pa]
13
19
25
32
40
49
58
67
77
99
122
148

Throw
(0.25m/s)
[m]
4
7
11
16
21
25
>25
>25
>25
>25
>25
>25

Pressure
Drop
[Pa]
13
19
25
32
40
49
58
67
77
88
99
122

Throw
(0.25m/s)
[m]
5
10
14
19
25
>25
>25
>25
>25
>25
>25
>25

Pressure
Drop
[Pa]
13
19
25
32
40
49
58
67
77
88
99
122

Throw
(0.25m/s)
[m]
7
12
17
23
>27
>27
>27
>27
>27
>27
>27
>27

Pressure
Drop
[Pa]
13
19
25
32
40
49
58
67
77
88
99
122

Throw
(0.25m/s)
[m]
8
14
20
26
>27
>27
>27
>27
>27
>27
>27
>27

Single Deflection

250
28.2
33.7
38.1
41.9
45.1
48.0
50.6
52.9
55.0
58.8
62.0
64.9

Sound Power Level, dB re 1E-12W

Octave Band Centre Frequency (Hz)
500
1000
2000
24.3
10.8
29.8
18.5
8.7
34.2
24.9
15.8
37.9
30.3
21.9
41.2
34.9
27.2
44.0
39.1
31.8
46.6
42.7
35.9
48.9
46.1
39.7
51.0
49.1
43.1
54.7
54.5
49.1
58.0
59.1
54.4
60.9
63.2
59.0

4000
9.8
15.8
21.0
25.6
29.7
33.4
36.8
42.8
48.0
52.6

8000
6.3
11.3
15.7
19.5
23.0
26.1
28.9
34.0
38.3
42.2

250
29.8
35.2
39.7
43.4
46.7
49.6
52.1
54.4
56.6
58.5
60.3
63.6

Sound Power Level, dB re 1E-12W

Octave Band Centre Frequency (Hz)
500
1000
2000
26.1
13.1
31.5
20.9
11.5
35.9
27.3
18.6
39.7
32.6
24.7
42.9
37.3
29.9
45.8
41.4
34.6
48.3
45.1
38.7
50.6
48.4
42.4
52.7
51.4
45.9
54.7
54.2
49.0
56.5
56.8
51.9
59.7
61.5
57.2

4000
12.4
18.4
23.6
28.2
32.3
36.0
39.4
42.5
45.4
50.6

8000
8.3
13.3
17.7
21.5
25.0
28.1
30.9
33.6
36.0
40.3

250
31.1
36.6
41.0
44.8
48.0
50.9
53.5
55.8
57.9
59.9
61.7
64.9

Sound Power Level, dB re 1E-12W

Octave Band Centre Frequency (Hz)
500
1000
2000
27.6
15.1
5.1
33.0
22.9
13.9
37.4
29.3
21.0
41.2
34.7
27.1
44.4
39.3
32.3
47.3
43.4
37.0
49.8
47.1
41.1
52.1
50.4
44.8
54.2
53.5
48.3
56.2
56.3
51.4
58.0
58.8
54.3
61.2
63.5
59.6

4000
7.6
14
20.7
25.9
30.5
34.6
38.3
41.7
44.8
47.7
52.9

8000
10.0
15.0
19.4
23.3
26.7
29.8
32.7
35.3
37.7
42.1

250
32.4
37.8
42.2
46.0
49.2
52.1
54.7
57.0
59.1
61.1
62.9
66.1

Sound Power Level, dB re 1E-12W

Octave Band Centre Frequency (Hz)
500
1000
2000
28.9
17.0
7.3
34.4
24.8
16.0
38.8
31.1
23.2
42.5
36.5
29.3
45.8
41.2
34.5
48.6
45.3
39.1
51.2
48.9
43.3
53.5
52.3
47.0
55.6
55.3
50.5
57.6
58.1
53.6
59.4
60.7
56.5
62.6
65.4
61.8

4000
9.6
16.7
22.7
27.9
32.5
36.6
40.4
43.7
46.9
49.8
55.0

8000
5.6
11.6
16.6
21.0
24.8
28.3
31.4
34.2
36.9
39.3
43.7

NR
10
15
20
24
27
30
33
36
39
44
49
53

125
36.3
40.8
44.4
47.4
50.1
52.4
54.5
56.4
58.1
61.2
63.8
66.2

NR
12
17
22
26
29
32
35
38
41
44
47
51

125
37.8
42.2
45.8
48.9
51.5
53.8
55.9
57.8
59.6
61.1
62.6
65.3

NR
13
19
23
27
30
33
37
40
43
46
49
54

125
39.0
43.4
47.0
50.1
52.7
55.1
57.2
59.1
60.8
62.4
63.8
66.5

NR
15
20
25
28
32
35
39
42
45
48
51
55

125
40.1
44.5
48.2
51.2
53.9
56.2
58.3
60.2
61.9
63.5
65.0
67.6

NAM FOONG (M) SDN BHD (8070-T)

Category

Neck
Area

0.163 m2

Category

Neck
Area

0.194 m2

Category

Neck
Area

0.235 m2

Category

Neck
Area

0.271 m2

Neck
Velocity
[m/s]
1.5
1.75
2
2.5
3
3.5
4
4.5
5
5.5
6
6.5

Flow
[I/s]

Neck
Velocity
[m/s]
1.5
1.75
2
2.5
3
3.5
4
4.5
5
5.5
6
6.5

Flow
[I/s]

Neck
Velocity
[m/s]
1.5
1.75
2
2.5
3
3.5
4
4.5
5
5.5
6
6.5

Flow
[I/s]

Neck
Velocity
[m/s]
1.5
1.75
2
2.5
3
3.5
4
4.5
5
5.5
6
6.5

Flow
[I/s]

245
286
327
409
491
572
654
736
818
900
981
1063

291
339
388
485
582
679
776
873
970
1067
1164
1260

353
412
471
588
706
824
941
1059
1177
1294
1412
1530

408
476
544
679
815
951
1087
1223
1359
1495
1631
1767

Pressure
Drop
[Pa]
8
11
13
19
25
32
40
49
58
67
77
88

Throw
(0.25m/s)
[m]
5
7
10
16
23
30
>30
>30
>30
>30
>30
>30

Pressure
Drop
[Pa]
8
11
13
19
25
32
40
49
58
67
77
88

Throw
(0.25m/s)
[m]
6
8
12
18
25
>30
>30
>30
>30
>30
>30
>30

Pressure
Drop
[Pa]
8
11
13
19
25
32
40
49
58
67
77
88

Throw
(0.25m/s)
[m]
7
10
13
21
29
>30
>30
>30
>30
>30
>30
>30

Pressure
Drop
[Pa]
8
11
13
19
25
32
40
49
58
67
77
88

Throw
(0.25m/s)
[m]
8
11
15
23
31
>31
>31
>31
>31
>31
>31
>31

Single Deflection

250
26.5
30.2
33.5
38.9
43.4
47.1
50.4
53.2
55.8
58.1
60.3
62.2

Sound Power Level, dB re 1E-12W

Octave Band Centre Frequency (Hz)
500
1000
2000
23.2
8.6
27.0
14.0
4.0
30.2
18.7
9.3
35.6
26.5
18.1
40.1
32.8
25.2
43.8
38.2
31.3
47.0
42.9
36.5
49.9
47.0
41.2
52.5
50.7
45.3
54.8
54.0
49.1
56.9
57.0
52.5
58.8
59.8
55.6

4000
11.5
18.6
24.7
29.9
34.4
38.5
42.3
45.6
48.8

8000
7.1
13.0
18.1
22.4
26.3
29.7
32.9
35.7
38.3

250
27.5
31.2
34.5
39.9
44.4
48.1
51.4
54.2
56.8
59.1
61.2
63.2

Sound Power Level, dB re 1E-12W

Octave Band Centre Frequency (Hz)
500
1000
2000
24.3
10.1
28.1
15.5
5.8
31.3
20.2
11.1
36.7
28.0
19.8
41.2
34.3
27.0
44.9
39.7
33.1
48.2
44.4
38.3
51.0
48.5
42.9
53.6
52.2
47.1
55.9
55.5
50.8
58.0
58.5
54.3
59.9
61.3
57.4

4000
4.5
13.2
20.3
26.3
31.5
36.1
40.2
43.9
47.3
50.4

8000
8.4
14.3
19.4
23.7
27.6
31.0
34.1
37.0
39.6

250
28.6
32.3
35.6
41.0
45.5
49.2
52.5
55.4
57.9
60.3
62.4
64.3

Sound Power Level, dB re 1E-12W

Octave Band Centre Frequency (Hz)
500
1000
2000
25.6
11.8
29.4
17.2
7.8
32.6
21.9
13.1
38.0
29.7
21.9
42.4
36.0
29.0
46.2
41.4
35.1
49.4
46.1
40.3
52.3
50.2
45.0
54.8
53.9
49.1
57.2
57.2
52.9
59.3
60.2
56.3
61.2
63.0
59.4

4000
6.4
15.1
22.2
28.2
33.4
38.0
42.1
45.8
49.2
52.4

8000
9.8
15.8
20.8
25.2
29.0
32.5
35.6
38.4
41.1

250
29.4
33.2
36.4
41.9
46.3
50.1
53.3
56.2
58.8
61.1
63.2
65.2

Sound Power Level, dB re 1E-12W

Octave Band Centre Frequency (Hz)
500
1000
2000
26.6
13.1
30.3
18.5
9.3
33.5
23.2
14.6
39.0
30.9
23.4
43.4
37.3
30.5
47.1
42.7
36.6
50.4
47.3
41.8
53.2
51.5
46.5
55.8
55.1
50.6
58.1
58.5
54.4
60.2
61.5
57.8
62.2
64.3
60.9

4000
7.9
16.5
23.6
29.7
34.9
39.4
43.6
47.3
50.7
53.8

8000
10.9
16.9
21.9
26.3
30.1
33.6
36.7
39.5
42.2

NR
9
12
16
21
26
30
33
37
41
44
47
50

125
35.4
38.5
41.2
45.6
49.2
52.3
54.9
57.2
59.3
61.2
62.9
64.5

NR
10
14
17
23
27
31
34
38
42
45
49
51

125
36.4
39.4
42.1
46.5
50.1
53.2
55.8
58.2
60.2
62.1
63.9
65.5

NR
11
15
18
24
28
32
36
40
44
47
50
53

125
37.4
40.5
43.1
47.5
51.2
54.2
56.9
59.2
61.3
63.2
64.9
66.5

NR
12
16
19
25
29
33
37
41
45
48
51
54

125
38.2
41.2
43.9
48.3
51.9
55.0
57.6
60.0
62.1
64.0
65.7
67.3

NAM FOONG (M) SDN BHD (8070-T)

Category

Neck
Area

0.308 m2

Category

Neck
Area

0.344 m2

Category

Neck
Area

0.407 m2

Category

Neck
Area

0.491 m2

Neck
Velocity
[m/s]
1.5
1.75
2
2.5
3
3.5
4
4.5
5
5.5
6
6.5

Flow
[I/s]

Neck
Velocity
[m/s]
1.5
1.75
2
2.5
3
3.5
4
4.5
5
5.5
6
6.5

Flow
[I/s]

Neck
Velocity
[m/s]
1.5
1.75
2
2.5
3
3.5
4
4.5
5
5.5
6
6.5

Flow
[I/s]

Neck
Velocity
[m/s]
1.5
1.75
2
2.5
3
3.5
4
4.5
5
5.5
6
6.5

Flow
[I/s]

462
539
616
717
925
1079
1233
1387
1541
1695
1849
2004

517
603
689
861
1033
1205
1378
1550
1722
1894
2066
2239

609
711
812
1016
1219
1422
1625
1828
2031
2234
2437
2640

736
859
982
1227
1472
1718
1963
2208
2454
2699
2945
3190

Pressure
Drop
[Pa]
8
11
13
19
25
32
40
49
58
67
77
88

Throw
(0.25m/s)
[m]
9
13
16
25
>31
>31
>31
>31
>31
>31
>31
>31

Pressure
Drop
[Pa]
8
11
13
19
25
32
40
49
58
67
77
88

Throw
(0.25m/s)
[m]
10
14
18
27
>31
>31
>31
>31
>31
>31
>31
>31

Pressure
Drop
[Pa]
8
11
13
19
25
32
40
49
58
67
77
88

Throw
(0.25m/s)
[m]
11
15
20
29
>31
>31
>31
>31
>31
>31
>31
>31

Pressure
Drop
[Pa]
8
11
13
19
25
32
40
49
58
67
77
88

Throw
(0.25m/s)
[m]
13
17
22
32
>32
>32
>32
>32
>32
>32
>32
>32

Single Deflection

250
30.2
33.9
37.2
42.6
47.1
50.8
54.1
56.9
59.5
61.8
64.0
65.9

Sound Power Level, dB re 1E-12W

Octave Band Centre Frequency (Hz)
500
1000
2000
27.4
14.2
4.6
31.1
19.6
10.7
34.4
24.3
15.9
39.8
32.1
24.7
44.2
38.4
31.8
48.0
43.8
37.9
51.2
48.5
43.2
54.1
52.6
47.8
56.6
56.2
51.9
58.9
59.6
55.7
61.0
62.6
59.1
63.0
65.4
62.2

4000
3.9
9.1
17.8
24.9
30.9
36.1
40.7
44.8
48.5
51.9
55.0

8000
4.5
11.8
17.8
22.9
27.2
31.1
34.5
37.6
40.5
43.1

250
30.8
34.6
37.8
43.3
47.7
51.5
54.7
57.6
60.2
62.5
64.6
66.5

Sound Power Level, dB re 1E-12W

Octave Band Centre Frequency (Hz)
500
1000
2000
28.1
15.2
5.8
31.8
20.6
11.8
35.1
25.2
17.1
40.5
33.0
25.8
44.9
39.4
33.0
48.7
44.8
39.1
51.9
49.4
44.3
54.8
53.5
48.9
57.3
57.2
53.1
59.7
60.5
56.8
61.8
63.6
60.3
63.7
66.4
63.4

4000
5.0
10.2
18.9
26.0
32.0
37.2
41.8
45.9
49.6
53.0
56.1

8000
5.4
12.7
18.6
23.7
28.1
31.9
35.4
38.5
41.3
43.9

250
31.8
35.5
38.8
44.2
48.7
52.4
55.7
58.6
61.1
63.4
65.6
67.5

Sound Power Level, dB re 1E-12W

Octave Band Centre Frequency (Hz)
500
1000
2000
29.2
16.7
7.5
32.9
22.0
13.5
36.2
26.7
18.8
41.6
34.5
27.6
46.0
40.9
34.7
49.8
46.2
40.8
53.0
50.9
46.0
55.9
55.0
50.7
58.4
58.7
54.8
60.7
62.0
58.6
62.8
65.0
62.0
64.8
67.8
65.1

4000
6.6
11.8
20.5
27.6
33.6
38.8
43.4
47.5
51.2
54.6
57.7

8000
6.6
13.9
19.9
24.9
29.3
33.2
36.6
39.7
42.6
45.2

250
32.9
36.6
39.9
45.3
49.8
53.5
56.8
59.7
62.2
64.5
66.7
68.6

Sound Power Level, dB re 1E-12W

Octave Band Centre Frequency (Hz)
500
1000
2000
30.4
18.3
9.5
34.2
23.7
15.5
37.4
28.4
20.8
42.8
36.2
29.5
47.3
42.5
36.7
51.0
47.9
42.8
54.2
52.6
48.0
57.1
56.7
52.6
59.7
60.3
56.8
62.0
63.7
60.5
64.1
66.7
64.0
66.0
69.5
67.1

4000
8.5
13.7
22.4
29.5
35.5
40.7
45.3
49.4
53.1
56.5
59.6

8000
8.1
15.4
21.3
26.4
30.7
34.6
38.0
41.1
44.0
46.6

NR
13
17
20
26
30
34
38
43
46
50
53
55

125
38.9
41.9
44.6
49.0
52.6
55.7
58.3
60.6
62.7
64.6
66.4
67.9

NR
14
18
21
26
31
35
39
44
47
51
54
56

125
39.5
42.5
45.2
49.6
53.2
56.3
58.9
61.2
63.3
65.2
67.0
68.5

NR
15
19
22
28
32
36
41
45
49
52
55
58

125
40.3
43.4
46.0
50.5
54.1
57.1
59.8
62.1
64.2
66.1
67.8
69.4

NR
16
20
23
29
33
38
43
47
50
54
57
60

125
41.4
44.4
47.1
51.5
55.1
58.2
60.8
63.1
65.2
67.1
68.9
70.4

NAM FOONG (M) SDN BHD (8070-T)

___________________________________________________________________________________
___

PERFORMANCE NOTES

Units are tested accordance with the Air Diffusion Council (USA) Equipment
Test Code 1062 : GRD-84. Measurements were taken in general accordance
with the following standards :ACOUSTICS
International Standard ISO 3741 Clause 8.3 (Method 11) Acoustics
Determination of Sound Power Levels of Noise Sources Precision Methods
for Broad-Band Sources in Reverberation Rooms.
AIRFLOW
Air Diffusion Council (USA) Equipment Test Code 1062 : GRD-84.
THROW AND STATIC PRESSURE DROP
Air Diffusion Council (USA) Equipment Test Code 1062 : GRD-84.

TEST SET UP AND PROCEDURE

Reverberation Test Room has a volume of 170m3 has been qualified in accordance
with the procedures in ISO 3741 for determination of sound power in octave bands
with Centre Frequencies from 125 Hz to 8000 Hz.
The Units under test were set up in the Air Distribution (Reverberation) Test Chamber
and connected to a quiet air supply.
The units were supplied with ambient temperature air at the specified airflow. The
environmental test conditions in the reverberation chamber varied for each test within
the following ranges : Test Air Temperature

18 degrees C 2.0 degree C

Room Air Temperature

20 degrees C 2.0 degree C

Barometric Pressure

1040 millibar 5 millibar

Relative Humidity

60 10%

SELECTION NOMOGRAM - PRESSURE DROP vs FLOW vs THROW vs NR

NAM FOONG - SINGLE DEFLECTION GRILLE
1000.00

A
B

C
G

20m
16m
13m

100.00

J
K
L
N
O

10m
P

Pressure [Pa]

7m
4m

NR 50

NR 45
NR 35 NR 40
NR 30

10.00

NR 25
NR 20
NR 15
NR 10

1.00

10

100

1000
Flow [l/s]

10000