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.
The stream should be aimed directly at the base of the fire. This will extinguish the source of the flame. Aiming it at the flame itself will have little impact.
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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.
The fire extinguisher contents are designed to interact with thefuel/air boundary, so you need to aim at where the fuel is burning,that is, "at the base of the flames." Home. Subjects. Math.
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Reference:
https://www.usfa.fema.gov/
https://en.wikipedia.org/wiki/Fire_extinguisher