Calculation example

Ventilator: DTV450-4-1FCDTV450-4-1FC

Desired output:
qv = 1100 l/s (3960 m3/h) and pt = 200 Pa

Thik line Capacity data
Doddet line SFP curve (J/m3)
Thin line Operating curves

 

K[dB(A)]

Kw[dB]

  KWA KpA 125 Hz 250 Hz 500 1K 2K 4K 8K
          Hz Hz Hz Hz Hz
 LW1     I: 3
II: 8
I: 4
II: 1
-2 -6 -13 -16 -21
LW3 6 I: 0
II: 7
I: 8
II: 6
-1 3 -4 -13 -20
 LpA3   -22              

Reading:

Read off  LWA1 (extract duct)  on curve.

LWA1:  72 in range I (marked with red dot on diagram)

Suction side (outdoor air/extract air)

Frequency band  125  250  500  1K  2K  4K   8K
 LWA1 read off in range I 72
Correction factor KW (LW1) read off on diagram 3 4 -2 -6 -13 -16 -21
Sound output level suction side LW1 75 76 70 66 59 56 51

Surroundings (sound output)
Frequency band  125  250  500  1K  2K  4K   8K  dB(A)
LWA1 read off in range I 72  72 72 72 72  72  72  72
 Correction factor KW (LW3) read off on diagram 0 8 -1 3  -4 -13 -20 6
 Sound output level pressure side LW3  72 80 71  75  68  59 52 78

 

Surroundings (sound pressure)
 Weighting dB(A) 
LWA1 read off in range I  72
Correction factor KpA (LW3) read off on diagram  -22
Sound pressure level surroundings LpA3  50