SELEC TIoN
WH45P
31
/42
rev 20-10
6.5.
Pressure drop and sound level graph Ø 450-800
Example
Ø = Diameter [mm]
Ø = 630 mm
Q = Air flow [m³/h]
Q = 20000 m³/h
V1 = Frontal air speed [m/s]
V1 = 17,8 m/s
ΔP = Pressure drop [Pa]
From graph: ΔP = 36 Pa
Lw = Sound level [dB(A)]
From graph: Lw = 59 dB(A)
6.6.
Sound spectrum table
Correction used to estimate the octave band spectrum (Values to be added to the noise levels in dB(A))
Frontal speed
Frequency Hz
m/s
63
125
250
500
1000
2000
4000
8000
6
15
7
4
-4
-9
-10
-15
-22
9
17
8
5
-4
-9
-10
-19
-20
12
20
9
5
-4
-9
-15
-16
-12
WH45P
31
We reserve the right to make changes without prior notice