What size and color should the lettering for "Do not use this elevator" on a fire sign be?

The recommended size and color for the lettering on the "Do not use this elevator" fire sign is 3/16" in red. This specification is designed to ensure that the sign is highly visible and easily readable in emergency situations. Using a larger size like 3/16" enhances legibility from a distance, making it more effective in alerting individuals about the elevator's status. The red color is universally recognized as a warning and signifies danger, which is appropriate for the context of the sign, notifying people that they should not use the elevator during a fire or emergency. In contrast, smaller lettering or different colors could compromise visibility and clarity, undermining the sign's purpose in a critical moment.