DG 1110-3-106
Table 4-2 Criteria for Laboratory Classrooms.
Space Criteria
Area/Student
30-60 s.f./student
Ceiling Height
10 ft.
Reference: TM 5-809-1, Structural Design
Floor Loading
Environmental
Thermal
68F. (heating), 78F. (cooling)
Temperature, maintained operation
Relative humidity
50-60%
10 cfm (minimum) (fumes, smoke potential, excessive
Outside air required/person
heat may require up to 100% exhaust)
Air
changes
6 per hour (minimum)
Air
movement
40 cfm (maximum)
Air
pressure
Negative
Air
filtration efficiency
35% (minimum using NBS dust spot test)
Lighting
General lighting level
30 fc. (maintained)
Visual comfort probability
70, reference: IES Lighting Handbook Applications
Volume
Surface reflectance: Ceiling
70-90%
Walls
40-60%
Floor
30-50%
Yes
Daylighting
Orientation of Windows
North or south
Enclosing wall sound rating:
Between instructional spaces
STC 45
Between instructional spaces and corridors
STC 40
Sound reflectance: Ceiling
Absorptive, NRC 50 (minimum)
Walls:
Reflective
Floor
Absorptive, NRC 25 (minimum)
Service Criteria
Electrical
Power
110 V
Telephone/intercom clock control as programmed
Signal (low voltage)
Reference: paragraph 3-2g
Adaptability
4-20
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