Dell PowerEdge C5220 Guide De Mise En Route page 18

Acoustics
Sound Power (Units: LwAd-UL,bels)
Idle in 23 ± 2
SPEC power at 50% in 23 ± 2
ambient
NOTE:
LwAd-UL is the upper limit sound power level (LwAd) calculated by ISO 9296
(1988) and measured in accordance with ISO7779 (1999).
16
Technical Specifications
°
C ambient
°
C
<= 7.0
<= 7.2