Which action is critical before using a fire extinguisher?

Before using a fire extinguisher, it is crucial to check that you have the proper type for the fire. Fire extinguishers are classified into different types based on the kinds of fires they are designed to combat—such as Class A for ordinary combustibles, Class B for flammable liquids, Class C for electrical fires, and so on. Using the wrong type of extinguisher can be ineffective or could even exacerbate the fire situation. For example, using water on a grease fire can spread the flames and create a more dangerous situation. Hence, verifying that you have the correct extinguisher tailored to the specific type of fire you are dealing with is an essential step for safety and effectiveness in fire response.