What color and size is the lettering for "Fire" on a fire sign?

The correct specification for the lettering of "Fire" on a fire sign is 3/8 inches in red. This size and color are mandated to ensure clear visibility and strong emphasis, which are crucial for safety in emergency situations. The red color is universally associated with fire or danger, making it immediately recognizable to individuals needing guidance in urgent scenarios.

Using a 3/8 inch size ensures that the sign can be seen from a reasonable distance, allowing people to quickly identify the location of fire-related equipment or exits. This specific attention to detail plays a vital role in fire safety protocols, where clear signage can be the difference in emergency response efficacy. While other options propose different sizes, only the 3/8 inch standard strikes the ideal balance between visibility and compliance with safety regulations.