MIL-HDBK-1191
wrapping such as reinforced leaded vinyl or sheet lead.
23.4.8.3
Drive systems. In addition to resiliently isolating the service
runs from the building structure, the drive units, transfer or diverter units,
and exhauster, associated with each type of system run should also be
isolated, as will the motors, pumps, compressors, gear and drive assemblies.
23.4.9
Emergency power systems. Emergency generators are typically
located near the major power plant loads, somewhat physically isolated from
acoustically sensitive areas, but such location must also be suitably close to
patient care emergency loads to insure adequate service. Generator noise and
location and configuration must consider visible emissions, noise levels and
directionality of produced noise effects on patients, staff and neighboring
facilities. Typical specifications for sound limitation should meet
residential area requirements.
23.4.10
Other electrical systems. Interior dry distribution transformers
and fluorescent lighting fixtures should be specified to limit intrinsic
acoustic "hum" noise to non-noticeable levels in functional areas.
23-15
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