Which standpipe system is designed to be used by fire suppression personnel trained in handling large hoselines?

• A. Class II
• B. Class III
• C. Class I
• D. Class IV

Answer: (C)

Standpipe classifications define who should use the system and what size hose outlets they feed. The option designed for fire suppression personnel trained to handle large hoselines is Class I. Its outlets are 2.5 inches in diameter, allowing connection to large-diameter attack hoses and enabling the high flow needed for interior firefighting. Firefighters with the appropriate training and equipment use these outlets with their pumping setups to conduct decisive interior attacks. By contrast, Class II provides 1.5-inch preconnected hoses for occupant use, and Class III combines both outlet sizes for mixed use; Class IV is not the standard option for large-hose attack.