What is the NFPA regulation number associated with hazardous materials at a fixed facility?

The NFPA regulation number specifically associated with hazardous materials at a fixed facility is 704. This regulation is part of the National Fire Protection Association's guidelines, which outlines how to classify hazardous materials and communicate potential risks. NFPA 704 primarily uses a color-coded system, known as the Fire Diamond, to indicate the health hazard, flammability, reactivity, and specific hazards of chemicals stored and used at these facilities.

This system is essential for emergency responders and personnel working with hazardous materials, as it provides a quick visual representation of the hazards involved. The information conveyed by the NFPA 704 system enables better preparation and response to incidents involving hazardous materials, ensuring safety for both workers and the surrounding community. This regulation is a fundamental aspect of hazardous materials management in fixed facilities, which is why it is the correct answer in this context.