What is the size of an NFPA 704 placard?

The NFPA 704 placard, which is used to communicate the hazards associated with materials, is specifically designed to be an 11x11 inches square. This standardized size helps ensure that the placards are easily recognizable and provide critical safety information quickly in emergency situations. The dimensions are crucial for visibility and consistency across various facilities and transportation methods.

The design and size of the NFPA 704 placard also play a significant role in its function—being a square makes it easy to identify and provides a uniform area for the colored diamonds that indicate health, flammability, reactivity, and specific hazards. Standardization in size ensures that emergency responders can effectively identify hazards without confusion, thereby enhancing safety protocols in hazardous material management and response.