Which halon is used only in fixed extinguisher installations?

Halon 1301 is the correct choice because it is specifically designed for use in fixed extinguishing systems. These systems are installed in places such as commercial kitchens, computer rooms, and other critical areas where traditional fire suppression methods may not be effective or might cause more damage than the fire itself. Halon 1301 is a clean agent that leaves no residue, making it suitable for sensitive equipment and occupied areas.

The focus of Halon 1301's applications ensures compliance with safety standards while effectively suppressing fires without harming personnel or damaging valuable assets. Its use has been largely phased out due to environmental concerns, but it remains recognized for its specific application in fixed installations. Other halons, such as Halon 1000, Halon 1211, and Halon 2402, do not share this same designation for fixed systems, which is why they do not serve the same purpose or meet the same criteria as Halon 1301.