What determines the discharge duration for a Class K extinguisher?

• A. It varies by model; follow the manufacturer indicated duration.
• B. The discharge duration is fixed regardless of model.
• C. It depends on room size.
• D. It lasts until the operator stops.

Answer: (A)

Discharge duration is determined by how the extinguisher is built—the amount of wet chemical agent it contains and the discharge rate designed into that model. Because both factors vary by model, each unit has its own defined run-time specified by the manufacturer. That’s why the correct approach is to check the extinguisher’s label or data sheet for the exact duration. It’s not governed by the size of the room, and the spray lasts until the extinguisher’s contents are exhausted (not simply “until the operator stops”).