9
V. 3.1-300317
brookvent.co.uk
3.4 Airflow: Pressure/ Performance Curve
3.5 Acoustic Performance
Airflow
Measurement
Full Octave Lw dB
Overall
Sound
Power
Level
(linear)
Overall
Sound
Power
Level (A
Weighted)
Dba @3m
%
63
125
250
500
1K
2K
4K
8K
Lw dB
Lwa dB
20
Case Radiated
31.7 42.5 38.3 28.3 19.6
9.8
12.4 20.9
44.3
32.8
15.3
Inlet
29.2 40.6 41.5 35.1 26.6 16.3
14
21.6
44.8
36.5
22.0
Extract
25.7
27
28.8 25.8 14.7
9.8
12.3 20.9
33.4
26.6
12.1
40
Case Radiated
35
46.2
44
41.4 31.1 20.7 14.5 20.9
49.3
41
23.5
Inlet
41.5 45.9 45.6 43.5 37.4 29.9 19.2 22.9
50.7
43.8
29.3
Extract
33.3 38.2 37.8 36.6 28.8 16.2 12.6 20.9
43.1
36.1
21.6
60
Case Radiated
41.3 55.4 48.3 44.3 36.5 28.6 19.9 21.1
56.6
45.6
28.1
Inlet
47.2 51.9 53.9 51.8 45.8 41.4 30.4 27.9
58.2
52.3
37.8
Extract
39.2 44.3 48.1 41.7 35.4 26.1 15.1 21.3
50.7
43.2
28.7
80
Case Radiated
44.4
58
52.3
50
39.4 34.5 26.5 23.5
59.7
50
32.5
Inlet
48.9 59.8 61.6 58.7 53.2 50.1 40.7 38.1
65.5
59.7
45.2
Extract
40.3 49.2 53.1 47.1 40.4 32.6 20.2
22
55.6
48.3
33.8
100
Case Radiated
46.4 54.6 57.3 57.7 47.1 41.9 35.2 27.4
61.8
56.4
38.9
Inlet
49.3 63.4 62.9 67.3 59.6 55.5 47.4 45.5
70.4
66.4
51.9
Extract
44.4 53.7 55.3 54.9 46.9 38.8 28.4 26.7
59.9
54.2
39.7
*Case radiated sound at 3m is calculated based on Hemi-spherical propagation.
**Inlet and Extract sound at 3m is calculated based on uniform line source.
