Sound data, calculation example

Ventilator: BESB200-4-1FC

Desired output: 300 l/s (1,080 m3/h) and pt = 150 Pa

BESF200-4-1FC

Reading:

Read off  LWA1 (extract duct)  on curve.

LWA1: 68 in range III (marked with red dot on diagram)

Suction side (outdoor air/extract air)

Frequency band  63 125 250 500 1K 2K 4K 8K
 LWA1 read off in range III 68
Correction factor KW (LW1) read off on diagram 9 8 1 -3 -6 -12 -14 -20
Sound output level suction side LW1 77 76 69 65 62 56 54 48

Pressure side (supply air/exhaust air)

Frequency band  63 125 250 500 1K 2K 4K 8K dB(A)
LWA1 read off in range III 68 68 68 68 68 68 68 68 68
Correction factor KW (LW2) read off on diagram  9 9 4 2 -2 -9 -12 -19 4
Sound output level pressure side LW2 77 77 72 70 66 59 56 49 72

 

Surroundings (sound output)

Frequency band  63 125 250 500 1K 2K 4K 8K dB(A)
LWA1 read off in range III 68  
Correction factor KW (LW3) read off on diagram -15 -22  -21 -25  -31 -32 -36 -37 -23
Sound output level surroundings (LW3) 53 46 47 43 37 36 32 31 45

Weighting dB(A) 
LWA1 read off in range III  68
Correction factor KW (LW3) read off on diagram  -37
Sound pressure level surroundings LpA3  31