A portable fire extinguisher can save lives and reduce property damage by putting out a small, contained fire or holding it in check until firefighters arrive. Home extinguishers are not designed for large or fast‑spreading fires. If there is any doubt about safety, leave immediately and call 9‑1‑1.
When Is It Safe to Use a Fire Extinguisher?
Use a fire extinguisher only if ALL of the following are true:
- You already know how to use it (there is no time to read instructions during an emergency).
- The extinguisher is fully charged, in working order, and within easy reach.
- You have a clear, safe escape route that will not be cut off by fire, smoke, or heat.
- The extinguisher is the correct type for the fire.
- The extinguisher is large enough to control the fire (many small household units discharge in about 8–10 seconds).
If any condition is not met: evacuate, close doors behind you if you can, and call 9‑1‑1.
Classes of Fires (Know What Your Extinguisher Can Handle)
Fire extinguishers are tested and labelled for the types of fires they can extinguish. Always check the label before buying or using an extinguisher.
Common household fire classes:
- Class A: Ordinary combustibles (wood, cloth, paper, some plastics)
- Class B: Flammable liquids (gasoline, oil, solvents, oil‑based paints)
- Class C: Energized electrical equipment (wiring, breaker panels, appliances)
A red slash through a symbol means the extinguisher is not approved for that type of fire.
Multipurpose ABC extinguishers can be used on Class A, B, and C fires and are the most common choice for homes.
Important safety note: Using the wrong extinguisher can make the fire worse. For example, some extinguishing agents may spread burning grease or liquids instead of suppressing them.
Choosing the Right Extinguisher Size (And Rating)
Extinguishers are rated for the size of fire they can handle. Ratings appear on the label (for example, 2A:10B:C). In general:
- Higher numbers = greater firefighting capacity
- Higher capacity usually means a heavier extinguisher
Choose a unit you can comfortably lift, carry, and operate with one hand while staying oriented to an exit.
Installation and Maintenance
Proper placement and upkeep are essential:
- Mount or place extinguishers in plain view, near an exit, and away from children
- Keep extinguishers away from cooking appliances and heat sources (so you can reach them without moving toward a fire)
- Inspect regularly per the manufacturer’s instructions (including pressure gauge/indicator and physical condition)
- Rechargeable extinguishers must be serviced after every use
- Disposable extinguishers must be replaced after use
- Replace or service any extinguisher that is damaged, corroded, missing a pin/tamper seal, or showing low pressure (as applicable)
How to Use a Fire Extinguisher: PASS
Stand about 6–8 feet (2–2.5 m) away, keep your back to a clear exit, and use PASS:
- P – Pull the pin (break the tamper seal)
- A – Aim low at the base of the fire
- S – Squeeze the lever to discharge
- S – Sweep side to side at the base of the fire
Move forward carefully as the fire diminishes. If the fire goes out and then reignites, repeat. If it doesn’t go out quickly, stop, leave, and close the door behind you.
Even if the fire appears out, have the area checked by firefighters—hidden fire spread and re‑ignition are common.
Should You Fight the Fire? (Final Safety Check)
Only attempt to extinguish a fire if:
- Everyone is leaving or has left the home
- 9‑1‑1 has been called (or someone is calling)
- The fire is small and contained (not spreading beyond its starting area)
- You have a clear escape route
- You know how to use the extinguisher and it’s the correct type
If any of these are not true: Do not fight the fire. Evacuate immediately.