Pressure Drop And Sound Level Graph Ø 450-800; Sound Spectrum Table - Lindab WH45P Technical Manual

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