PASS is a simple memory aid for using a fire extinguisher during a small, contained fire. It stands for Pull, Aim, Squeeze, and Sweep, which are the four actions needed to release the extinguishing agent safely and effectively. Knowing this sequence matters because hesitation or incorrect use can let a small fire grow quickly.
Always make sure you have a clear exit path and call for help before deciding to fight a fire.
Understanding Health: How to operate a fire extinguisher (PASS)
A fire keeps burning when heat, fuel, and oxygen are present together. This is often called the fire triangle. Different extinguishers stop one or more parts of that triangle.
Water cools ordinary burning materials such as wood, paper, and cloth. Foam can cover some burning liquids and reduce contact with oxygen. Carbon dioxide pushes oxygen away from the fire for a short time.
Dry powder interrupts the chemical reactions of flame. The label on an extinguisher tells you which fires it can handle. Using the wrong type can make the situation worse.
Water on burning cooking oil can scatter hot oil outward. Water near live electrical equipment can create a shock risk.
Before an emergency, inspect the extinguisher where you live, study, or work. It should be easy to reach and not hidden behind boxes or furniture. Check that its pressure gauge, if it has one, points to the ready range.
Look for damage, corrosion, a missing safety pin, or a broken seal. Read the label carefully because models differ in their range, discharge time, and approved fire classes. Many portable extinguishers empty in only a few seconds.
This means the stream must be used with purpose rather than sprayed randomly. Practice can help people recognize the handle, pin, hose, and label, but only trained staff should use equipment during a real fire drill if school rules require it.
Smoke is often more dangerous than the visible flames. It can contain poisonous gases, tiny particles, and very hot air. A room can become unsafe quickly, even when the fire looks small.
Stay low if smoke is present because cleaner air is often nearer the floor, but leave instead of trying to work through heavy smoke. Never turn your back on a fire while using an extinguisher. Watch for flames returning after the first burst stops them.
Some fuels remain hot underneath and can ignite again. Keep your exit behind you or to one side, so leaving remains simple if conditions change.
Fire extinguishers are useful for early action, not for solving every fire. A wastebasket fire in an open area may be manageable for a trained person with the correct extinguisher. A fire involving a ceiling, a wall, a large amount of fuel, a gas line, or spreading smoke needs emergency responders.
Cooking fires need special care. If a pan of oil catches fire, turn off the heat only if it is safe, cover the pan with a metal lid if possible, and do not carry it outside.
After any extinguisher is used, even briefly, report it and arrange for service or replacement. A partly discharged extinguisher may not work properly during the next emergency.
Key Facts
- PASS = Pull the pin, Aim at the base, Squeeze the handle, Sweep side to side.
- Use an extinguisher only on a small, contained fire when you have a clear escape route.
- Aim at the base of the flames because the fuel source is where the fire is being sustained.
- Stay about 6 to 8 feet away at first, then move closer only if the fire begins to go out.
- Sweep the stream side to side across the base until the fire is fully out.
- If the fire grows, spreads, or blocks your exit, stop immediately and evacuate.
Vocabulary
- PASS
- A mnemonic that helps people remember the steps Pull, Aim, Squeeze, and Sweep when using a fire extinguisher.
- Extinguishing agent
- The material inside a fire extinguisher that helps put out a fire by cooling it, smothering it, or interrupting the chemical reaction.
- Base of the fire
- The area where the burning material and fuel source are located.
- Escape route
- A clear path that allows you to leave the area quickly if the fire becomes unsafe.
- Contained fire
- A small fire that has not spread beyond its original object or area.
Common Mistakes to Avoid
- Aiming at the top of the flames instead of the base. This is wrong because the fuel source is at the bottom, and spraying too high may miss the part of the fire that must be suppressed.
- Standing too close before discharging the extinguisher. This is unsafe because heat, smoke, or sudden flare-ups can injure you and make escape harder.
- Forgetting to pull the pin before squeezing the handle. This prevents the extinguisher from discharging and wastes valuable time during an emergency.
- Trying to fight a spreading or large fire. This is wrong because extinguishers are meant for small, contained fires, and evacuation is safer when the fire is growing.
Practice Questions
- 1 You are 8 feet from a small wastebasket fire and the extinguisher works best from 6 to 8 feet away. How many feet closer should you move before starting if you want to be 6 feet away?
- 2 A fire extinguisher discharges for 12 seconds. If you spend 3 seconds aiming and then sweep evenly for the remaining time, how many seconds do you have to sweep the base of the fire?
- 3 A student sees a small trash can fire near a door but notices smoke spreading across the exit path. Should the student use PASS or evacuate first? Explain the reasoning.