IBM EXP15 Hardware Maintenance Manual page 14

– 47 dBA (open bay)
– 49 dBA (typical)
Sound Pressure (operating):
– 47 dBA (open bay)
– 50 dBA (typical)
These levels are measured in controlled acoustical
environments according to ISO 7779 and are reported in
accordance with ISO 9296. The declared sound power
levels indicate an upper limit, below which a large portion
of machines operate. Sound pressure levels in your
location might exceed the average 1-meter values stated
because of room reflections and other nearby noise.
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IBM Netfinity EXP15, EXP200, EXP500 HMM