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Noise considerations
Each BladeCenter T unit has four blowers for cooling. Table 11 shows the maximum
sound levels emitted by BladeCenter T units. This represents the minimum and
maximum number of BladeCenter T units that can be installed in a 42U rack.
Attention:
such as those prescribed by OSHA or European Community Directives, that cover
noise-level exposure in the workplace. The actual sound-pressure levels in your
installation depend on a variety of factors, including the number of servers in the
installation, the size, materials, and configuration of the room where the servers are
installed, the noise levels from other equipment, the room ambient temperature, and
employees' location in relation to the equipment. It is recommended that a qualified
person, such as an industrial hygienist, be consulted to determine whether the
sound-pressure levels to which employees may be exposed exceed regulatory
limits.
Table 11. BladeCenter T noise emissions for Types 8720 and 8730
Number of BladeCenter
T units per rack
1
2
3
4
5
Your server installation may be subject to government regulations,
Maximum sound power
operating and power idling
for Type 8720
6.7 bels
7.0 bels
7.2 bels
7.3 bels
7.4 bels
Maximum sound power
operating and power idling
for Type 8730
7.5 bels
7.8 bels
8.0 bels
8.1 bels
8.2 bels
Chapter 4. Installation considerations
53
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