Once it is pulled out, the extinguisher is unlocked and can therefore be discharged. Aim the hose. The hose should be aimed at the base of the fire. This is because the fuel causing the fire is at the bottom and in order to correctly extinguish the fire, you need to target the fuel.
You should aim the nozzle, hose or horn (on a CO2) at the base of any fire because this is where the fuel is, and this is the part you need to extinguish to stop the fire from continuing. If you simply aim at the flames you will not stop the fire permanently and your extinguisher will be empty before the fire is out.
When using a fire extinguisher you should aim at?
Pull the pin. Aim the nozzle at the base of the fire. Hitting the tops of the flame with the extinguisher won’t be effective. Squeeze the trigger. In a controlled manner, squeeze the trigger to release the agent. Sweep from side to side. Sweep the nozzle from side to …
Many fire extinguishers have a range of between 8 and 12 feet (2.4 to 3.7 m). Before discharging the extinguisher, move toward or away from the fire so you’re standing 6 to 8 feet (1.8 to 2.4 m) (1.8 to 2.4 m) away. You can move closer once you start dousing the fire and the flames die down.
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Reference:
https://www.usfa.fema.gov/
https://en.wikipedia.org/wiki/Fire_extinguisher