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A foam fire extinguisher is a small protective red colored device that is installed in the buildings, hospitals, cinema halls, malls, hotels, offices, etc. to control small fires. Though it is generally intended to be used in emergency situations, it may also be used to hit someone as shown in movies. It works on a simple principle that there are four things that need to be present where ever there is fire- oxygen, heat, a fuel and a chemical reaction. If any of these things are removed, the fire can be extinguished. There are generally two types of foam fire extinguishers being developed- water and foam based that eliminates the heat or oxygen, necessary for the chemical reaction thereby ceasing the fire and ensuring the complete safety of the place of installation. For better results, there should be an annual maintenance for the mountable foam fire extinguisher installed and an expertise should be allowed to handle and use it.