Nozzles shall be installed so as to be free of obstructions that could interfere with the proper distribution of the discharged agent in accordance with which guidance?

• A. In accordance with the building code.
• B. In accordance with the NFPA 101.
• C. In accordance with the manufacturer’s installation and maintenance manual.
• D. Based on local practice.

Answer: (C)

The key idea is that nozzle installation must follow the manufacturer’s instructions to guarantee the agent will distribute properly. The manufacturer’s installation and maintenance manual provides the tested, approved guidelines for nozzle clearance, mounting heights, spacing, and any specific installation constraints. Following these instructions ensures the discharge pattern isn’t compromised by obstructions and that the system delivers the intended protection.

General building codes or the Life Safety Code give broad safety requirements, but they don’t provide the exact nozzle installation details needed to avoid interfering with distribution. Local practice varies and may not align with the nozzle’s tested performance, so it’s the manufacturer’s manual that NFPA 2001 relies on for proper guidance. Also, adhering to the manual helps preserve listing and warranty and reduces the risk of improper performance during discharge.