source of electricity if safe to do so. We use a Class C fire extinguisher that has Both monoammonium phosphate and sodium bicarbonate. Spray and sway from the base left to right. Class-D fires Class-D fires include combustible metals which include potassium, uranium, sodium, lithium, calcium, and plutonium. The most common fires that occur for Class D are magnesium and titanium. The best way to extinguish a Class-D fire is to use a dry powder fire extinguisher. By using the powder extinguisher, it smothers the fire along with absorbing the heat that the fire produces and causes the fire to be extinguished. Class- K fires Class-K fires include cooking oils and grease fires, for example animal and vegetable fats. When cooking in the kitchen, it is extremely important to understand what a class K fire is. When a class K fire occurs, water should not be used, as it will disperse the material and cause the fire to grow rapidly. The correct fire extinguisher to use in this instance is the Class K fire extinguisher which is the wet chemical fire extinguisher. Ventilation Fires can spread through the interior of a structure as the hot gases spread due to the expansion of the gases as a result of the combustion. Some fires can be partially controlled by venting these gases to the outside through manufactured heat vents in the structure's roof, or by the fire department cutting holes in the roof. Ventilation is important when it comes to the fire service, since it is "the systematic removal or heat, smoke and fire gases from a structure". The main purpose for ventilating a fire is to decrease the likelihood of a flashover from occurring. The best time to ventilate is before sending anyone into a structure so that the path the fire will take is through the roof and not through the front door when firefighters open it, allowing more oxygen to feed the fire. See also Fire classes Fire bucket References Firefighting Wildfires Wildfire suppression