Those markings help to identify which class of fire each type of fire extinguisher is intended for:
Class A: ordinary combustibles;
Class B: flammable liquids
Class C: energized electrical fires.
A class A:B:C extinguisher may be used on any of these types of fires.
Triangle signifies Class A, for a Class A fire; ordinary combustibles.
Square is B, Circle is C, Star is D and Hexagon is K
To help distinguish one type from another.
it takes one of the elements of the fire triangle
Assuming this extinguisher is following Australian rules, that is a dry chemical extinguisher. If this is an American extinguisher, there are no standards, only conventions, and I couldn't tell you by color alone.
for every 1000 square feet there should requirement of on fire extinguisher.
Triangle
Under the US standards for fire extinguisher testing and labeling, the number tells you approximately how many square feet of flammable liquid surface can be covered using the fire extinguisher properly. For example, 40B would mean 40 square feet.
The first thing you must do is make sure you can get out safely if you are unable to stop the fire with the extinguisher. The second thing is to determine what type of fire it is so you choose the proper type of fire extinguisher. Do not consider a fire extinguisher if the fire is more than waist high or larger than 10 square feet -- leave immediately. The next thing is to get between the fire and your primary exit and use the extinguisher on the fire.
A fire extinguisher is meant to extinguish a fire, or at least a portion of the fire within the fire extinguisher's capacity.
how does a fire extinguisher work
A Class C fire extinguisher.
A Class C fire extinguisher.
It depends upon what kind of extinguisher it is. Water, for example, removes the heat from a fire by turning into steam and by removing available air/oxygen from the flames. Other extinguishers remove the oxygen from the fire or change the chemical reaction to stop the fire from converting the fuel to a flammable substance with the available heat.
We are use the co2 as fire extinguisher