Special Maintenance Considerations - Effective Building Maintenance: Protection of Capital Assets - page 114

Table 4-7. Task Specific Recommended Lighting Levels
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Illuminance

SpaceTypes (Footcandles)
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Group 1 Tasks
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A Public spaces 3
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B Simple orientation for short visits 5
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C Working spaces where simple visual
tasks are performed 10
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Group 2 Tasks
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D Performance of visual tasks of high
contrast and large size 30
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E Performance of visual tasks of high
contrast and small size, or visual tasks
of low contrast and large size. 50
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F Performance of visual tasks of low
contrast and small size 100
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Group 3 Tasks
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G Performance of visual tasks near
threshold of vision 300-1000
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Category

Therefore, vibration and noise control are critical design elements for
building systems.
Noise in a building can come from many sources: noise from the
outside entering through the building envelope; noise generated by
plumbing, HVAC, and electrical systems; noise generated by the build-
ing occupants; and noise produced by equipment and machinery housed
in the building. The human ear is not equally sensitive to all frequencies
of sound and noise can is perceived as “hissy” when the noise is con-
centrated in the higher frequencies, “rumbly” when concentrated in the
lower frequencies, and “neutral” when concentrated in the mid-range of