How to Properly Extinguish a Fire Before Leaving?

Choosing the Correct Extinguishing Agent

When selecting an extinguishing agent, consider the type of fire you’re dealing with. For Class A fires, which involve ordinary combustibles like wood and paper, use water or a water-based extinguishing agent. For Class B fires, which involve flammable liquids, use a foam extinguishing agent. At high altitudes, the air is thinner, so the extinguishing agent may not be as effective. In these cases, use a dry chemical extinguishing agent, which is more effective in lower oxygen environments.

The 30-50-70 Rule

To ensure the fire is completely extinguished, follow the 30-50-70 rule. This means that the fire should be reduced to:

• 30% of its original size after the first sweep of the nozzle
• 50% of its original size after the second sweep
• 70% or less of its original size after three sweeps. If the fire is not completely extinguished after three sweeps, evacuate the area and call for professional help.

Additional Considerations for High Altitude Fires

When dealing with fires at high altitudes, consider the following:

• The air is thinner, so the fire may spread more quickly
• The extinguishing agent may not be as effective
• The temperature may drop rapidly after the fire is extinguished, causing the extinguishing agent to become less effective. To combat these challenges, use a dry chemical extinguishing agent and follow the 30-50-70 rule closely.