Need to put out a fire? Here’s what you need to know: Ordinary combustibles (paper, wood, clothing): Use water to cool and extinguish or a Class A fire extinguisher. Gas, oil, or grease fires: Smother with a Class B extinguisher, fire blanket, dirt, or sand. Never use water—it’ll spread the fire. Electrical fires: Cut the power first. If the power is off, water or a Class C extinguisher can work. For small fires, use a fire-resistant blanket or sand. Combustible metals: No water. Use a dry powde