13. perforated grille

8/14/2019 13. Perforated Grille

1/5


2/5

Neck Flow Pressure Throw

Category Velocity [I/s] Drop (0.25m/s) NR

[m/s] [Pa] [m] 125 250 500 1000 2000 4000 8000

2 70 26 8 13 31.5 26.3 25.8 23.0 18.0 12.2 9.1

2.25 79 34 10 16 33.8 28.6 28.2 26.0 21.9 16.8 13.1

2.5 87 42 11 19 35.8 30.7 30.3 28.7 25.4 20.9 16.6

2.75 96 51 12 22 37.7 32.6 32.2 31.1 28.6 24.6 19.8

3 105 61 13 25 39.4 34.3 34.0 33.3 31.5 28.0 22.7

3.5 122 84 15 30 42.4 37.3 37.1 37.2 36.7 34.1 27.8

4 140 112 17 35 45.0 39.9 39.7 40.6 41.2 39.3 32.3

4.5 157 143 18 39 47.3 42.2 42.1 43.6 45.1 43.9 36.2

5 175 178 20 43 49.3 44.3 44.2 46.3 48.6 48.0 39.8

5.5 192 217 21 47 51.2 46.1 46.1 48.7 51.8 51.7 42.9

6 210 260 22 50 52.9 47.8 47.9 50.9 54.7 55.1 45.9

6.5 227 307 24 53 54.5 49.4 49.5 52.9 57.4 58.3 48.5



[m/s] [Pa] [m] 125 250 500 1000 2000 4000 8000

1.5 85 14 5 8 29.1 24.3 22.9 18.4 10.6 - -

1.75 99 20 8 12 32.1 27.3 26.0 22.3 15.8 8.8 5.6

2 113 26 9 16 34.7 29.9 28.7 25.7 20.2 14.0 10.12.25 127 34 11 19 37.0 32.2 31.1 28.6 24.2 18.7 14.0

2.5 142 42 12 21 39.1 34.3 33.2 31.3 27.7 22.8 17.5

2.75 156 51 14 24 40.9 36.2 35.1 33.7 30.9 26.5 20.7

3 170 61 15 27 42.6 37.9 36.9 35.9 33.8 29.9 23.6

3.5 198 84 17 32 45.7 40.9 40.0 39.9 39.0 35.9 28.8

4 227 112 19 36 48.3 43.5 42.6 43.2 43.4 41.2 33.2

4.5 255 143 20 41 50.6 45.8 45.0 46.2 47.4 45.8 37.2

5 283 178 22 45 52.6 47.9 47.1 48.9 50.9 49.9 40.7

5.5 312 217 24 49 54.5 49.7 49.0 51.3 54.1 53.6 43.9

N k Fl P Th

Face

Size

B 301mm x

301mm

NAM FOONG (M) SDN BHD (8070-T) Perforated Ceiling Diffuser

A 250mm x

250mm

Sound Power Level, dB re 1E-12W

Octave Band Centre Frequency (Hz)Face

Size


Octave Band Centre Frequency (Hz)

S d P L l dB 1E 12W


3/5

NAM FOONG (M) SDN BHD (8070-T) Perforated Ceiling Diffuser



[m/s] [Pa] [m] 125 250 500 1000 2000 4000 8000

1.5 228 14 9 14 35.8 31.7 28.9 23.8 15.3 6.6 -

1.75 266 20 11 18 38.8 34.7 31.9 27.7 20.5 12.7 7.5

2 304 26 13 21 41.4 37.3 34.6 31.1 24.9 17.9 11.9

2.25 342 34 14 24 43.7 39.6 37.0 34.0 28.9 22.5 15.9

2.5 380 42 16 27 45.8 41.7 39.1 36.7 32.4 26.6 19.4

2.75 418 51 17 29 47.7 43.5 41.0 39.1 35.6 30.3 22.6

3 456 61 18 32 49.4 45.2 42.8 41.3 38.5 33.7 25.5

3.5 532 84 21 37 52.4 48.3 45.9 45.2 43.7 39.8 30.6

4 608 112 23 41 55.0 50.9 48.5 48.6 48.1 45.0 35.1

4.5 684 143 26 45 57.3 53.2 50.9 51.6 52.1 49.6 39.0

5 761 178 28 49 59.3 55.2 53.0 54.3 55.6 53.7 42.6

5.5 837 217 31 52 61.2 57.1 54.9 56.7 58.8 57.5 45.7



[m/s] [Pa] [m] 125 250 500 1000 2000 4000 8000

1 194 6 4 8 29.6 25.6 22.2 14.8 - - -

1.25 243 10 7 12 33.9 30.0 26.7 20.5 10.4 - -

1.5 292 14 10 16 37.5 33.5 30.3 25.1 16.5 7.6 -

1.75 340 20 12 19 40.5 36.5 33.4 29.0 21.6 13.6 7.9

2 389 26 13 22 43.1 39.1 36.1 32.4 26.1 18.8 12.4

2.25 438 34 15 25 45.4 41.4 38.5 35.4 30.0 23.5 16.3

2.5 486 42 16 28 47.5 43.5 40.6 38.1 33.6 27.6 19.9

3 583 61 19 33 51.0 47.1 44.2 42.7 39.7 34.7 26.0

3.5 681 84 22 38 54.0 50.1 47.3 46.6 44.8 40.7 31.1

4 778 112 25 42 56.6 52.7 50.0 50.0 49.3 46.0 35.6

4.5 875 143 28 46 58.9 55.0 52.4 53.0 53.2 50.6 39.5

5 972 178 30 50 61.0 57.1 54.5 55.6 56.8 54.7 43.0

Face

Size

Face

Size

F 504mm x

504mm

E 453mm x

453mm






4/5

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

______________________________________________________________________________________

PERFORMANCE NOTES

Units are tested accordance with the Air Diffusion Council (USA) EquipmentTest 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

R b ti T t R h l f 170

3

h b lifi d i d


5/5

SELECTION NOMOGRAM - PRESSURE DROP vs FLOW vs THROW vs NR

NAM FOONG - PERFORATED CEILING DIFFUSER

1000.00

100.00

10.00

1.00

Pressure

[Pa]

Flow [l/s]

100 1000 1000010

4m

10m

A

NR 10

BC

DE F G

H

NR 15

NR 20

NR 25

NR 30

NR 35

NR 40

NR 45

NR 50

7m

13m

16m

20m

13. perforated grille

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