10/01/2015
Different classification of fires and fire extinguishers.
All fires are not the same. They are divided into classes, with each class requiring a different method to extinguish and different fire extinguishers. The use of an incorrect method can actually exacerbate the situation. Let’s discuss the different classification of fires and fire extinguishers.
Classes of fires and methods for extinguishing
fires are classified as A, B, C, D, or K.
Class A are created when ordinary combustible materials, such as wood and paper, are ignited, and can be extinguished using water or dry chemicals.
Class B involve flammable materials such as gasoline or oil and require dry chemical or carbon dioxide fire extinguishers, with water being ineffective.
Class C involve the use of electricity, and must be extinguished with dry chemicals or carbon dioxide. As was the case with Class B, water cannot be used.
The most effective treatment for Class D, which originate from combustible materials, such as sodium or magnesium, is a dry powder agent. Not only is water ineffective for Class D, it can actually create an explosion if applied.
Class K originate in the kitchen when cooking oils or fats on the stove or in the oven. Placing a lid on a pot or closing the oven door is often an effective remedy. However, special types of kitchen fire suppression systems are available for these applications.
