What is an essential requirement for the information on installation labels for fixed extinguisher systems?

The essential requirement for the information on installation labels for fixed extinguisher systems is that all information must be presented in boldface type and capital letters. This requirement serves a crucial purpose: it ensures that the information is easily readable and stands out to those who may need to reference the installation details quickly during an emergency. By using boldface and capital letters, the labels enhance visibility, reducing the chance of misreading critical information about the system's operation or maintenance.

The other options, while they may describe some sort of formatting, do not meet the standardized requirements necessary for safety and clarity. Italicized text may hinder readability, and allowing any font color could compromise the visibility of the information, especially in low-light situations. Additionally, limiting capital letters solely to the firm's name does not provide the comprehensive clarity required for all critical installation information. Thus, the formatting requirements emphasize clarity and immediate recognition in urgent scenarios.