Fire Extinguisher Types. Water. Water is the primary liquid used in these extinguishers, although sometimes other additives are also included. A drawback for pure water fire … Film-forming foam type. AFFF (aqueous film-forming foam) and FFFP (film-forming fluoroprotein) fire extinguishers are …
Used for ordinary combustibles such as wood, paper, some plastics and textiles. This fire class requires the heat-absorbing effects of water or the coating effects of certain dry chemicals. According to NFPA, extinguishers suitable for Class A fires should be identified by a triangle containing the letter “A.”.
Guide to Fire Extinguisher Sizes, Types, & Ratings
Fire Extinguisher Sizes. The size of a fire extinguisher indicates the amount of extinguishing agent it holds and is most often measured in pounds. Sizes can …
Film-forming foam type. AFFF (aqueous film-forming foam) and FFFP (film-forming fluoroprotein) fire extinguishers are rated for use on both Class A and Class B fires. As the name implies, they discharge a foam material rather than a liquid or powder. They are not suitable for use in freezing temperatures.
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How do you identify a Class B fire extinguisher?
These fire extinguishers deprive the fire of oxygen and interrupt the fire chain by inhibiting the release of combustible vapors. According to NFPA, extinguishers suitable for Class B fires should be identified by a square containing the letter “B.” If in color, the square should be red.
What are the different types of chemical fire extinguishers?
Types of agents available include sodium bicarbonate base and potassium bicarbonate base. Dry chemical type extinguishers have special treatments that ensure proper flow capabilities by providing resistance to packing and moisture absorption (caking). Fire extinguishers of this type contain an ammonium phosphate base agent.
What do the numbers on a fire extinguisher mean?
One A is equivalent to 1.25 gallons of water, so a unit with a 4A rating has an equivalent of 5 gallons of water to battle Class A fires. B: The number in front of the "B" is a relative measure of the area an extinguisher can cover. C & K: These letters indicate that an extinguisher can be used effectively against these fire classes.
How do you label a fire extinguisher?
Fire Extinguisher Signs and Labels 1 Promote quick identification 2 Use eye-catching, vibrant red and white coloring Arrows and other graphics also help call attention to the location 3 Can be mounted directly above or beside the extinguisher, or further away to indicate its general direction
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Fire Extinguisher NFPA Video Answer
Reference:
https://www.usfa.fema.gov/
https://en.wikipedia.org/wiki/Fire_extinguisher