To properly use a fire extinguisher, remember PASS: Pull the pin, Aim at the base, Squeeze the lever, and Sweep side to side.
Knowing how to properly use a fire extinguisher can mean the difference between a minor incident and a total loss. But technique matters less than judgment. A portable extinguisher is designed for one job: knocking down a small, contained fire while you still have a path to escape. The U.S. Fire Administration’s guidance is clear about the conditions that must be met before you ever squeeze that lever.
When Should You Actually Use An Extinguisher?
You should only attempt to fight a fire if every one of these is true: the fire is confined to a small area like a trash can or stovetop pan, everyone else has already exited the building, the fire department has been called or is being called, and the room is not filled with smoke. If the fire is growing, you don’t know what is burning, you’re not safe from toxic smoke, or your exit is blocked—evacuate immediately and call 911.
Their job is to get out and stay out. For everyone else, the standard operating method comes down to four letters.
The PASS Method: The Only Technique You Need
The PASS method is the universally taught fire extinguisher technique. Here is the exact sequence that works.
- Pull the pin at the top of the handle. This breaks the tamper seal and unlocks the lever.
- Aim low, pointing the nozzle or hose at the base of the fire, not at the flames themselves.
- Squeeze the lever slowly and evenly to discharge the agent.
- Sweep the nozzle side to side, moving across the base of the fire until it is out.
Position yourself at a safe distance with a clear exit at your back. Most dry chemical units work best from roughly 6 to 10 feet away. CO2 units, the kind often used for electrical fires, are more effective from about 5 to 7 feet. If the fire doesn’t start to shrink within a few seconds, stop and get out.
After the flames die, back away slowly and keep watching the area. Fires frequently re-ignite, and a discharged extinguisher is empty—it must be recharged before it can be used again. The moment you use one, treat it as spent.
Which Extinguisher For Which Fire?
Using the wrong extinguisher can be useless or dangerous. The letter codes on the label tell you what each unit can handle.
| Class | What It Fights |
|---|---|
| A | Wood, cloth, paper, rubber, many plastics |
| B | Flammable liquids like gasoline, oils, solvents, and grease |
| C | Energized electrical equipment |
| D | Combustible metals like magnesium and lithium |
| K | Cooking oils and fats in commercial kitchens |
For a home, a multi-purpose dry chemical unit rated ABC is the standard choice because it covers the three most common household fire types. One important safety note from the NFPA: energized electrical equipment is Class C, and water-based agents on a live circuit create a serious shock risk. If you’re not certain what’s burning, don’t guess—leave it to the professionals. For guidance on choosing the right unit for your space, our review of the best fire extinguisher for garage use covers the top-rated options for that higher-risk environment.
If you have a CO2 extinguisher for electrical fires, never touch the plastic discharge horn during use. It gets intensely cold and can damage your skin on contact.
Frequently Asked Questions
How far away should I stand from the fire?
Stand roughly 6 to 10 feet from the flames for a standard dry chemical unit. CO2 extinguishers are more effective closer, at about 5 to 7 feet. Always keep your escape route behind you so you can turn and leave instantly if the fire grows.
What should I do after the fire appears to be out?
Back away slowly and keep your eyes on the area. Fires can re-ignite, especially if the fuel source is still hot. If the fire does not stay out or starts to expand again, evacuate immediately and call 911. Any extinguisher that has been used, even briefly, must be recharged.
Can I use water on an electrical fire?
No. Water conducts electricity, and using a water-based agent on energized electrical equipment creates a serious shock hazard. Electrical fires are Class C and require a dry chemical, CO2, or other non-conductive agent. If you don’t have the right type, evacuate and call the fire department.
References & Sources
- U.S. Fire Administration. “Fire Extinguishers.” Provides the core PASS method, when-to-use conditions, and who should not operate an extinguisher.
- University of Rochester. “Fire Extinguisher Use.” Details the single-extinguisher rule, training recommendation, and safe operational distances.