Hitachi NAS Platform 4000 Series Hardware Reference Manual page 31

Airflow:
Single fan in free
air
Fan m^3/mi
speed n
@ 100% 7.40 261.22
@ 2/3 4.93 174.15
@1/3 2.47 87.07
Figure 1 Airflow performance curves
Item
1 Performance curves, pulse width modulation (PWM) = 100%
2 Static pressure (Pa)
3 Airflow (m3/minute)
Chapter 4: Hitachi NAS Platform server components
Hitachi NAS Platform and Hitachi Unified Storage Series 4000 Hardware Reference
Single fan at
33%
perforation
CFM m^3/min
2.96
1.97
0.99
Description
Server specifications
Two fans at 33%
perforation
m^3/mi
n CFM
5.92 208.98 Not used
3.95 139.32 Fan failure or
over temperature
1.97 69.66 Normal
operation
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