How do you use a fire extinguisher?

Short answer: To use a fire extinguisher, remember PASS: Pull the safety pin, Aim the nozzle at the base of the flames, Squeeze the handle, and Sweep side to side until the fire is out. Before you act, confirm the fire is small and contained, that you have a clear exit behind you, and that the extinguisher class matches the fuel. If the fire grows or the room fills with smoke, stop and evacuate.

How to use a fire extinguisher: the PASS method (2026)

Knowing how to use a fire extinguisher is one of the highest-leverage safety skills in any workplace or home, because most fires are small and survivable in their first 30 to 60 seconds. The federal rule that governs portable units, OSHA 29 CFR 1910.157, requires extinguishers to be accessible, inspected, and - where employees are expected to use them - backed by hands-on training. This guide is written for facility managers, supervisors, and anyone who keeps an extinguisher on the wall and wants to be sure they can use a fire extinguisher correctly under pressure.

The mechanics are simple enough to learn in minutes, but the decisions around them are what keep people safe: matching the extinguisher class to the fuel, keeping an exit at your back, and recognizing the point at which fighting the fire becomes more dangerous than leaving. Below we break down the PASS method, decode the fire-class system that tells you when a given extinguisher is safe to use, and walk through a real ABC unit from our fire extinguishers lineup so the workflow is concrete.

Why this matters.
The U.S. Fire Administration reports that a portable extinguisher used promptly on a small fire can prevent it from spreading - but using the wrong class, or staying too long, gets people killed. OSHA 1910.157(g) requires employers to train employees who are expected to use extinguishers when they are first assigned and at least annually. If your emergency action plan tells workers to fight incipient fires but they have never been trained, the program is both unsafe and out of compliance.

Part 1 - What the PASS method stands for

PASS is the universally taught discharge sequence for a portable fire extinguisher. Each letter is a discrete action, and the order matters:

• P - Pull the safety pin, breaking the tamper seal. This unlocks the lever.
• A - Aim the nozzle or hose at the base of the fire, not the flames. Putting out the fuel source is what stops combustion.
• S - Squeeze the lever or handle with steady pressure to release the agent.
• S - Sweep the nozzle side to side across the base of the fire until it is out, then watch for re-ignition.

Most handheld units discharge fully in only 8 to 20 seconds, so there is no time to read instructions during a fire. The PASS sequence is meant to be muscle memory, which is exactly why OSHA and NFPA 10 emphasize hands-on practice rather than a one-time video.

Part 2 - Match the extinguisher class to the fuel

Using the wrong agent can make a fire worse - water on a grease fire spreads it, and water on energized electrical equipment is a shock hazard. Every extinguisher is rated for one or more fire classes, printed as a letter (and often a picture symbol) on the label. The decode table below shows the five classes you will encounter and which extinguisher to reach for. Most general-purpose units sold in our ABC dry chemical extinguishers collection cover Classes A, B, and C, which handle the large majority of workplace and home fires.

Part 3 - Read the rating number, not just the letter

Class letters tell you what an extinguisher fights; the numbers in front of A and B tell you how much. A 2-A:10-B:C rating means the unit has the extinguishing capacity of about 2.5 gallons of water on Class A fuels (the A number times 1.25 gallons), can cover roughly 10 square feet of a Class B liquid fire, and is safe on Class C energized equipment (C carries no number). A higher number is a bigger fire knocked down, at the cost of more weight. For a balanced home or small-shop unit, a 2-A:10-B:C rating like the Kidde FA110G fire extinguisher is a common baseline.

Part 4 - Set up before you discharge: the exit comes first

The single most important habit is positioning. Stand 6 to 8 feet back from the fire with a clear, unobstructed exit behind you - never let the fire get between you and the door. Fire produces toxic smoke within seconds, so plan to back away as the fire shrinks rather than walking toward it. If you have a wall-mounted extinguisher cabinet, the unit should already be at a height and location your team can reach without crossing the hazard.

When NOT to fight the fire

Only attempt an incipient-stage fire - one no larger than a wastebasket. Evacuate and call 911 instead if: the fire is spreading or already larger than you; it is between you and your exit; the room is filling with smoke; you are unsure of the fuel; or you have no training. There is no shame in leaving - extinguishers buy seconds, not minutes.

Part 5 - After you use a fire extinguisher

A discharged extinguisher is empty or depressurized even if it still feels heavy, so it must be recharged or replaced before it goes back on the wall - never rehang a used unit. Rechargeable models from our rechargeable extinguishers collection can be serviced by a licensed company; disposable single-use units are discarded. Watch the fire area for re-ignition, ventilate dry-chemical residue, and log the event in your flammable-storage and fire program records.

Part 6 - Inspection and the OSHA training rule

Under 29 CFR 1910.157, portable extinguishers must be visually inspected monthly and given a full maintenance check annually, with hydrostatic testing on a 5- or 12-year cycle depending on type. Employers who expect staff to use extinguishers must provide training at assignment and annually thereafter. The consensus standard behind the rule, NFPA 10, sets the placement, sizing, and service details. Pair extinguishers with working smoke detectors and carbon monoxide alarms so the fire is detected early enough that an extinguisher is still an option.

Fire classes and the right extinguisher

Part 7 - Worked example: using an ABC extinguisher on a small office fire

To make the workflow concrete, here is how to use a fire extinguisher on a small, incipient-stage trash-can fire in an office, using a multipurpose ABC unit like the First Alert HOME2PRO rechargeable fire extinguisher (2-A:10-B:C):

1. Confirm it is safe to fight. Verify the fire is small and contained, the alarm is pulled, someone is calling 911, and you have a clear exit at your back. Read the label to confirm the unit is rated A, B, and C for an office fire that may involve paper and a power strip.
2. Pull the pin. Hold the extinguisher upright, grip the carry handle, and pull the ring pin straight out to break the tamper seal. Do not squeeze the lever yet.
3. Aim at the base. From 6 to 8 feet back, point the nozzle at the base of the flames where the fuel is burning - aiming at the visible flame tops wastes agent and does nothing to stop combustion.
4. Squeeze the lever. Squeeze the top lever down with firm, steady pressure to discharge the dry chemical. Keep the unit upright.
5. Sweep side to side. Sweep the nozzle horizontally across the base of the fire, advancing slightly as the flames die down, until the fuel is fully coated and the fire is out. A 2-A:10-B:C unit gives you roughly 10 to 15 seconds of discharge.
6. Back away and watch for re-ignition. Once the fire is out, back toward your exit while watching the area - dry chemical can leave hot fuel that re-ignites. Leave the recharged or replaced unit ready and document the event in your fire records.

The same PASS workflow applies to the rest of the units we stock - from a compact Kidde 711A kitchen fire extinguisher to a multi-class Ostutry 8-in-1 ABCK extinguisher. For help choosing capacity and class, see our best fire extinguishers buyer's guide and the OSHA 1910.157 standard explainer.

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Frequently asked questions

What does PASS stand for on a fire extinguisher?

PASS stands for Pull, Aim, Squeeze, Sweep. Pull the safety pin, aim the nozzle at the base of the fire, squeeze the handle to discharge, and sweep side to side until the fire is out. It is the standard method taught for every handheld extinguisher and is the core of how to use a fire extinguisher.

Where do you aim a fire extinguisher?

Always aim at the base of the fire, where the fuel is burning, not at the flames themselves. Coating the fuel source is what stops combustion; spraying the flame tops wastes the limited 8 to 20 seconds of agent most units carry.

What is an ABC fire extinguisher used for?

An ABC extinguisher uses multipurpose dry chemical and handles Class A (ordinary combustibles), Class B (flammable liquids), and Class C (energized electrical equipment). It covers the majority of workplace and home fires, which is why our ABC dry chemical extinguishers are the most common general-purpose choice.

What do the numbers on a fire extinguisher mean?

The numbers rate capacity. The A number times 1.25 gives the water-equivalent gallons for Class A fuels; the B number is roughly the square footage of liquid fire an average user can cover. Class C carries no number because it only indicates the agent is safe on electricity. So 2-A:10-B:C means moderate Class A capacity, 10 sq ft of Class B, and electrical safety.

Can you use a fire extinguisher on an electrical fire?

Only if it is rated Class C, such as an ABC dry chemical or CO2 unit. Never use water or a water-based extinguisher on energized equipment - it conducts electricity and can cause a fatal shock. De-energize the circuit if you safely can.

What kind of extinguisher do you use on a grease fire?

Commercial kitchens require a Class K wet-chemical extinguisher for cooking oils and fats. For a small home stovetop fire, a Class K or a compact unit like the Kidde 711A kitchen fire extinguisher is appropriate. Never use water on a grease fire - it violently spreads the burning oil.

How far back should you stand when using a fire extinguisher?

Start about 6 to 8 feet from the fire, then move closer only as the flames shrink. Standing back keeps you out of the heat and smoke and preserves a clear path to your exit, which must always be behind you.

How long does a fire extinguisher last when discharged?

Most handheld units empty in just 8 to 20 seconds of continuous discharge - a small 2-A:10-B:C unit gives roughly 10 to 15 seconds. That short window is exactly why the PASS sequence must be automatic and why you should never approach a fire larger than a wastebasket.

When should you not fight a fire with an extinguisher?

Evacuate instead of fighting if the fire is larger than a wastebasket, spreading, between you and your exit, producing heavy smoke, or of unknown fuel - or if you are untrained. Extinguishers are for incipient-stage fires only; when in doubt, get out and call 911.

Does OSHA require fire extinguisher training?

Yes. Under OSHA 29 CFR 1910.157(g), employers who expect employees to use portable extinguishers must train them on the hazards and proper use at initial assignment and at least annually. If your plan instead requires total evacuation, lighter training applies.

How often should fire extinguishers be inspected?

OSHA and NFPA 10 require a quick visual inspection monthly (pressure gauge in the green, pin and seal intact, no damage), a thorough maintenance check annually by a qualified person, and hydrostatic testing every 5 or 12 years depending on the extinguisher type.

Can you reuse a fire extinguisher after using it?

No - never rehang a used extinguisher. Even a brief discharge can leave it depressurized or partially empty. Rechargeable units from our rechargeable extinguishers collection must be professionally serviced; disposable units are replaced.

What is the difference between a rechargeable and disposable extinguisher?

Rechargeable extinguishers have a metal valve and can be refilled and pressure-tested by a licensed company, making them cost-effective for businesses. Disposable units have a plastic valve, are single-use, and are discarded after any discharge or when the gauge drops. Browse both in our fire extinguishers collection.

What size fire extinguisher do I need?

For a home or small office, a 2-A:10-B:C unit such as the Kidde home ABC extinguisher is a sensible baseline; shops and garages often step up to a 3-A:40-B:C. Our best fire extinguishers buyer's guide matches capacity to space.

Where should fire extinguishers be mounted?

Mount extinguishers along normal exit paths, near hazards but not so close that a fire blocks access, at a height reachable by all staff. A labeled extinguisher cabinet protects the unit and marks its location. NFPA 10 sets maximum travel distances by fire class.

What should I do after putting out a fire?

Back away while watching for re-ignition, ensure 911 has been called even if the fire is out, ventilate the area, and have the unit recharged or replaced immediately. Document the incident in your fire program and review your first aid kit in case anyone was injured.

Further reading on this site

• Fire extinguishers — the full lineup of ABC, kitchen K-class, rechargeable, and vehicle extinguishers we stock.
• ABC dry chemical extinguishers — multipurpose units that cover Class A, B, and C fires - the common general-purpose choice.
• Kitchen K-class extinguishers — wet-chemical units for cooking-oil and grease fires.
• Extinguisher cabinets — mounting cabinets that protect and mark the location of wall units.
• Best fire extinguishers buyer's guide — how to choose capacity and class for your space.
• OSHA 1910.157 explained — the portable fire extinguisher standard, inspection, and training rules.
• Smoke detectors — early detection so a fire is caught while an extinguisher can still stop it.
• OSHA first aid kit requirements — pair fire response with compliant first aid supplies.