Pre-engineered clean agent systems must be listed to one of the following two types. Which statement correctly describes the two types?

• A. Those consisting of system components designed to be installed according to pre-tested limitations by a testing laboratory.
• B. Automatic extinguishing units incorporating special nozzles, flow rates, methods of application, nozzle placement, actuation techniques, piping materials, discharge times, mounting techniques, and pressurization level that could differ from those detailed elsewhere in this standard.
• C. Both A and B.
• D. Neither A nor B.

Answer: (C)

Pre-engineered clean agent systems can be listed in two valid ways to ensure reliable performance. One path covers system components that are designed to be installed within pre-tested limitations published by a recognized testing laboratory. This means the parts themselves are tested and rated to specific constraints, and when you assemble the system from those parts, the overall performance is validated by those pre-tested limits.

The other path covers whole automatic extinguishing units that bring their own set of specifications—such as nozzles, flow rates, methods of application, nozzle placement, actuation techniques, piping materials, discharge times, mounting, and pressurization. These units may differ from details elsewhere in the standard, but they are listed as complete, validated units.

Since both approaches provide verified, compatible performance, the description that both types exist is the correct understanding.