What is the rule regarding mixing dry chemical fire extinguishers?

The guideline that prohibits mixing different types of dry chemical fire extinguishers is grounded in safety and effectiveness. Each type of dry chemical extinguisher contains specific agents designed to combat different types of fires, such as Class A (ordinary combustibles), Class B (flammable liquids), and Class C (electrical fires). Mixing them can lead to ineffective suppression and increase the risk of fire emergencies worsening.

Different chemical agents can have incompatible properties, potentially creating harmful reactions or reducing the performance of the extinguisher. Therefore, it's crucial to use extinguishers as they are intended and avoid any mixing that can compromise their effectiveness or safety. This rule ensures that when a fire occurs, the extinguishers being used will perform reliably and safely without unexpected reactions that can lead to dangerous situations.