|
Calculation formula |
|
Correction factor K |
|---|
|
LWA = LWAO x K |
|
Sap [m2] |
0.01 |
0.15 |
0.2 |
0.3 |
0.4 |
|
|
K [dB(A)] |
0 |
+1.5 |
+3 |
+4.5 |
+6 |
Designation:
ΔP - pressure loss [Pa];
LWA - sound power level [dB(A)];
LWAO - sound power level for air pass 0.1 m2 [dB(A)];
KL - correction factor for sound power level depending on air pass [dB(A)];
AK - air area [m2];
V - rated speed [m/s].