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What Doors Require Exit
Devices?
The preceding table shows when exit devices are
required, but it is necessary to understand the
exit system to determine where they are required
within the building. While calculating the occupant
load is the design team’s responsibility, it is
important to understand how it is determined. Codes
determine occupant loads based on a square-foot-per-occupant
figure, as shown in Table II.
Table II
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| Code |
Reference & Comments |
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| BOCA |
[Table 806.1.2]
Occupant load does not apply, except for those
portions of buildings used for assembly or
educational, as follows:
Assembly:
- 7 net sq. ft./person: Concentrated (no
fixed chairs)
- 15 net sq. ft./person: Unconcentrated
(tables & chairs)
- 3 net sq. ft./person: Standing space
Educational:
- 20 net sq. ft./person: Classrooms
- 50 net sq. ft./person: Vocational Rooms
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|
| SBC
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[Table 1103.1]
Assembly:
- 7 sq. ft./person: Concentrated use,
i.e. Auditoriums, churches, dance floors,
lodge rooms, reviewing stands, stadiums.
- 15 sq. ft./person: Unconcentrated use,
i.e. Conference rooms, exhibit rooms,
gymnasiums, lounges, skating rinks.
- 3 sq. ft./person: Standing space
Educational:
- Occupant load does not apply to exit
device placement.
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| UBC |
[Table 33-A]
Assembly:
- 7 sq. ft./person: Concentrated use,
i.e. Auditoriums, churches and chapels,
dance floors, lobby accessory to assembly
occupancy, lodge rooms, reviewing stands,
stadiums.
- 15 sq. ft./person: Less concentrated
use, i.e. Conference rooms, dining rooms,
drinking establishments, exhibit rooms,
gymnasiums, lounges, stages.
Educational:
- 20 sq. ft./person: Classrooms
- 50 sq. ft./person: Shops & vocational
rooms
Institutional:
- 80 sq. ft./person
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|
| LSC |
[Appendix Paragraph A-5-3.1.2]
Assembly:
- 15 sq. ft./person: Less concentrated
use without fixed seats
- 7 sq. ft./person: Concentrated use
without fixed seats
- 3 sq. ft./person: Waiting areas
Educational:
- 20 sq. ft./person: Classrooms
- 50 sq. ft./person: Shops, labs & vocational
rooms
- 35 sq. ft./person: Day care centers
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| Comparing occupant
load factors for the same occupancy group
shows the similarities between model codes.
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