Which is a primary factor when determining hazard classification for extinguisher selection and placement?

The primary factor when determining hazard classification for extinguisher selection and placement is the amount of combustibles present. This is crucial because the quantity of combustible materials determines the potential severity of a fire and influences the type of fire extinguisher needed. Different extinguishers are designed to combat specific classes of fires, which are classified based on the fuels involved.

When a fire occurs, the potential for rapid flame spread and fire growth is directly related to the quantity of combustibles. For example, a large quantity of flammable materials would require an extinguisher suitable for controlling those materials, as well as appropriate placement to ensure readiness and effectiveness. Firefighters and safety personnel assess the characteristics of the environment, such as the type of fuel and location of hazards, but the amount of combustibles present is paramount in ensuring that the selected extinguisher is appropriate to effectively manage the fire risk.