Class fires abcd12/11/2022 There are several clean agents that are similar to halon agents in that they are nonconductive, noncorrosive, and evaporate after use, leaving no residue. To some extent, windy conditions or strong air currents could make extinguishment difficult by causing the rapid dispersal of the agent. When discharged, the agent is in the combined form of a gas/mist with about twice the range of carbon dioxide. Compared to carbon dioxide on a weight-of-agent basis, bromochlorodifluoromethane (Halon 1211) is at least twice as effective. Some larger models of Halon 1211 fire extinguishers are listed for use on Class A as well as Class B and Class C fires. It is important to note that the production of Halon has been phased out because of the environmental damage it causes to the earth’s ozone. The bromochlorodifluoromethane (Halon 1211) fire extinguisher has an agent that is similar to carbon dioxide in that it is suitable for cold weather installation and leaves no residue. The concentration needed for fire extinguishment reduces the amount of oxygen in the vicinity of the fire and should be used with caution when discharged in confined spaces. This type of fire extinguisher is not recommended for outdoor use where windy conditions prevail or for indoor use in locations that are subject to strong air currents, because the agent can rapidly dissipate and prevent extinguishment. Because the agent is discharged in the form of a gas/snow cloud, it has a relatively short range of 3 ft to 8 ft (1 m to 2.4 m). Carbon dioxide extinguishers are listed for use on Class B and Class C fires. Other typical applications are food preparation areas, laboratories, and printing or duplicating areas. This can be a significant factor where protection is needed for delicate and costly electronic equipment. The principal advantage of Carbon Dioxide (CO 2) fire extinguishers is that the agent does not leave a residue after use. An advantage of this type of extinguisher when used on Class B flammable liquid fires of appreciable depth is the ability of the agent to float on and secure the liquid surface, which helps to prevent reignition. They are not suitable for use in freezing temperatures. As the name implies, they discharge a foam material rather than a liquid or powder. Typical applications include operating rooms, museums, and book collections.ĪFFF (aqueous film-forming foam) and FFFP (film-forming fluoroprotein) fire extinguishers are rated for use on both Class A and Class B fires. Water mist extinguishers are used where contaminants in unregulated water sources can cause excessive damage to personnel or equipment. Water mist extinguishers are a type of water fire extinguisher that uses distilled water and discharges it as a fine spray instead of a solid stream. These extinguishers are intended primarily for use on Class A fires. Water type fire extinguishers can also sometimes contain wetting agents which are designed to help increase its effectiveness against fire. Certain types of water fire extinguishers contain antifreeze which will allow the extinguisher to be used in freezing conditions. A drawback for pure water fire extinguishers is that it is not suitable for use in freezing conditions since the water inside will freeze and render the extinguisher unusable. Water is the primary liquid used in these extinguishers, although sometimes other additives are also included. This blog will address the different types of fire extinguishers by breaking them down by their extinguishing agent, which is the material inside the extinguisher that gets applied to the fire.įires in ordinary combustible materials, such as wood, cloth, paper, rubber, and many plastics.įires in flammable liquids, combustible liquids, petroleum greases, tars, oils, oil-based paints, solvents, lacquers, alcohols, and flammable gases.įires that involve energized electrical equipment.įires in combustible metals, such as magnesium, titanium, zirconium, sodium, lithium, and potassium.įires in cooking appliances that involve combustible cooking media (vegetable or animal oils and fats). When using an extinguisher or selecting an extinguisher to install, it’s important to know the characteristics of different fire extinguishers. #Class fires abcd portable#In the hands of a trained person, portable fire extinguishers are great tools to protect people and property from fire during early stages.
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