Dell PowerEdge C5220 Guide De Mise En Route page 18

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Acoustics
Sound Power (Units: LwAd-UL,bels)
°
Idle in 23 ± 2 C ambient
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
<= 7.0
°
C <= 7.2