Which statement about corridors protection is correct?

• A. Sprinklers are prohibited in residential corridors.
• B. Sprinklers allowed in residential corridors.
• C. Corridors must be left unprotected.
• D. Sprinklers must be installed only in commercial corridors.

Answer: (B)

Corridors in low-rise residential buildings are allowed to be sprinklered because these spaces serve as means of egress and can be critical paths for fire growth and smoke travel. Installing sprinklers in corridors helps slow fire development, control heat and smoke along the evacuation route, and support occupants and firefighters. NFPA 13R is designed to provide life safety in residential occupancies while balancing cost, so it does not prohibit sprinklers in corridors and allows them where appropriate. It’s not correct to say sprinklers are banned in residential corridors or that protection is limited to commercial spaces; residential buildings can have sprinkler protection in corridors when designed for it.