Strutt|Input Data|Empirical|Fan Casing Correction inserts octave band adjustments into the active row of the worksheet.
The adjustments are for determining the sound power radiated by fan housings and adjacent ductwork.
These octave band values should be subtracted from the calculated in-duct sound power level.
Octave band adjustments have been sourced from Table 11.3 in Bies and Hansen (2nd Edition), as follows:
| 63 Hz | 125 Hz | 250 Hz | 500 Hz | 1 kHz | 2 kHz | 4 kHz | 8 kHz |
| 0 dB | 0 dB | -5 dB | -10 dB | -15 dB | -20 dB | -22 dB | -25 dB |
References: