Reference to Fire-Flow Requirements for Type IIB Buildings:
The International Fire Code (IFC 2021), Appendix B, Table B105.1(2) establishes the minimum fire-flow requirements for buildings based on construction type, size, and the presence of sprinkler systems.
For a 75,000 sq. ft. Type IIB (non-combustible, unprotected) building without sprinklers, the required fire- flow is 5,500 gpm for 4 hours.
Why Fire-Flow Matters:
Fire-flow ensures that sufficient water is available to control and extinguish fires in large buildings.
Type IIB buildings lack built-in fire resistance enhancements, making adequate fire-flow crucial.
Clarification of Incorrect Answer Choices:
A: 3,000 gpm for 3 hours # Incorrect
Too low for a building of this size and construction type.
B: 4,000 gpm for 4 hours # Incorrect
Below the required 5,500 gpm per IFC Appendix B.
D: 5,750 gpm for 4 hours # Incorrect
Slightly above the requirement but not the exact minimum mandated by IFC Table B105.1(2).
Conclusion:
The correct and verified answer is C (5,500 gpm for 4 hours) as per IFC Appendix B, Table B105.1(2), ensuring compliance with fire-flow standards for Type IIB buildings without sprinklers.