To determine the maximum number of students permitted in a classroom, we must follow the occupant load calculation based on the 2021 International Building Code (IBC) and International Fire Code (IFC).
Step 1: Calculate the Room Area
The classroom measures 20 ft. x 30 ft., so the total area is:
20×30=600 sq. ft.20 \times 30 = 600 \text{ sq. ft.}20×30=600 sq. ft.
Step 2: Subtract the Area Occupied by Fixed Tables
Each table measures 4 ft. x 8 ft., so its area is:
4×8=32 sq. ft. per table4 \times 8 = 32 \text{ sq. ft. per table}4×8=32 sq. ft. per table
Since there are 4 tables:
32×4=128 sq. ft. occupied by tables32 \times 4 = 128 \text{ sq. ft. occupied by tables}32×4=128 sq. ft. occupied by tables
Step 3: Determine the Usable Space for Students
600−128=472 sq. ft. available600 - 128 = 472 \text{ sq. ft. available}600−128=472 sq. ft. available
Step 4: Apply the Occupant Load Factor
According to 2021 IBC Table 1004.5 (Occupant Load Factor), the factor for a classroom with tables and chairs is 20 sq. ft. per person.
472÷20=23.6472 \div 20 = 23.6472÷20=23.6
Since the occupant load must be rounded down, the maximum number of students is 24.
Reference to Fire Inspector Documentation:
1. 2021 International Building Code (IBC) – Table 1004.5 (Occupant Load Factor)
A classroom with tables and chairs requires 20 sq. ft. per occupant.
This method ensures compliance with egress and fire safety requirements.
2. 2021 International Fire Code (IFC) – Section 1004.1 (Occupant Load Determination)
The IFC states that occupant load is based on net usable floor area and must follow IBC Table 1004.5.
Detailed Explanation of Answer Choices:
Option A (Incorrect): 12 students would be too low based on the calculations.
Option B (Correct): 24 students is the accurate calculation following IBC 1004.5.
Option C (Incorrect): 30 students would exceed the available space per code.
Option D (Incorrect): 40 students is far above the allowed maximum.
Thus, the correct and verified answer is: B. 24.
