How to Use Fire Extinguisher: Complete Workplace Fire Safety Guide
Introduction
A fire extinguisher is one of the most common first-response fire-fighting equipment available in workplaces.
A small fire can sometimes be controlled with a suitable fire extinguisher before it develops into a major emergency. However, using the wrong extinguisher or attempting to fight an unsafe fire can make the situation worse.
Therefore, every employee should understand:
- What type of fire extinguisher is available.
- Which fire it can be used on.
- How to operate it.
- When it is safe to use it.
- When to evacuate.
- How to raise the alarm.
- How to report a fire.
- What precautions must be followed.
A fire extinguisher should only be used when the fire is small, the correct extinguisher is available, the person is trained or competent to use it, and a safe escape route remains available.
The primary objective is always life safety.
What is a Fire Extinguisher?
A fire extinguisher is a portable device designed to discharge a fire-fighting agent to control or extinguish a small fire.
Depending on the extinguisher, the extinguishing agent may include:
- Water.
- Foam.
- Dry chemical powder.
- Carbon dioxide (CO₂).
- Wet chemical.
- Other specialized agents.
Different extinguishing agents are suitable for different types of fires.
Therefore:
Never assume that every fire extinguisher can be used on every type of fire.
How Does Fire Start?
For combustion to continue, three basic elements are generally required:
- Heat
- Fuel
- Oxygen
These are commonly represented by the Fire Triangle.
If one of these elements is removed or sufficiently controlled, combustion can be stopped.
Some fire models also include a fourth element:
- Chemical chain reaction
This is known as the Fire Tetrahedron.
Different extinguishing agents work by methods such as:
- Cooling.
- Smothering.
- Separating fuel from oxygen.
- Interrupting the chemical chain reaction.
Why is Fire Extinguisher Selection Important?
Different fuels produce different types of fires.
For example:
Paper or cardboard
A water-type extinguisher may be suitable where permitted.
Flammable liquid
Water may be inappropriate and can spread the burning liquid.
Electrical equipment
Water should not be used where it can create an electrical hazard.
Cooking oil
A suitable wet-chemical type extinguisher may be required.
Combustible metals
Specialized extinguishing agents may be necessary.
Therefore, the correct extinguisher must be selected according to the fire hazard and applicable fire-class system.
Common Fire Classes
Fire-class terminology can vary somewhat between standards and countries. Always follow the classification shown on the extinguisher and the applicable local requirements.
Common workplace fire categories include:
Class A – Ordinary Combustible Materials
Examples:
- Paper.
- Cardboard.
- Wood.
- Cloth.
- Some plastics.
Typical extinguishing media may include water, foam or suitable dry chemical agents depending on the application.
Class B – Flammable Liquids
Examples:
- Petrol.
- Diesel.
- Solvents.
- Paints.
- Oils.
- Other flammable liquids.
Suitable extinguishing agents may include:
- Foam.
- Dry chemical powder.
- CO₂ for appropriate applications.
Water should not be used indiscriminately because it may spread some burning liquids.
Class C – Flammable Gases
Examples:
- LPG.
- Propane.
- Butane.
- Other flammable gases.
Suitable extinguishing media depend on the equipment and hazard.
Where safe and possible, the fuel supply should be isolated by trained personnel.
Class D – Combustible Metals
Examples can include:
- Magnesium.
- Sodium.
- Potassium.
- Certain metal powders.
These fires require specialized extinguishing agents.
Do not use ordinary water on a combustible-metal fire unless specifically confirmed as suitable for that material and situation.
Cooking Oil / Fat Fires
Commercial kitchens may have fires involving:
- Cooking oils.
- Cooking fats.
Suitable wet-chemical systems or extinguishers may be required.
Water should never be thrown onto a burning cooking-oil fire.
Common Types of Fire Extinguishers
1. Water Extinguisher
Generally used for suitable Class A combustible materials.
Examples:
- Paper.
- Wood.
- Cardboard.
Important
Water should not be used on:
- Energized electrical equipment.
- Burning flammable liquids.
- Situations where water can create an additional hazard.
Always check the extinguisher label.
2. Foam Extinguisher
Foam extinguishers can be suitable for certain:
- Class A fires.
- Flammable-liquid fires.
The exact application should be confirmed from the extinguisher marking and manufacturer's instructions.
3. Dry Chemical Powder Extinguisher
Dry chemical powder extinguishers are widely used for several workplace fire hazards.
Depending on the agent and rating, they may be suitable for:
- Ordinary combustibles.
- Flammable liquids.
- Flammable gases.
- Some electrical-fire situations.
The extinguisher label should always be checked before use.
4. CO₂ Extinguisher
CO₂ extinguishers are commonly used for appropriate:
- Electrical equipment fires.
- Certain flammable-liquid fires.
Advantages can include:
- No powder residue.
- Useful around certain electrical equipment.
However, CO₂ extinguishers are not suitable for every fire type and may provide limited effectiveness on deep-seated Class A materials.
5. Wet Chemical Extinguisher
Wet chemical extinguishers are designed primarily for suitable:
- Cooking oil.
- Cooking fat.
They are commonly used in commercial kitchen environments.
6. Specialized Extinguishers
Certain hazards require specialized extinguishing agents.
Examples:
- Combustible metals.
- Special industrial processes.
- Sensitive equipment.
The extinguisher must be specifically rated for the hazard.
Before Using a Fire Extinguisher
Before attempting to use an extinguisher, ask:
1. Is the fire small?
If the fire is large or rapidly growing, evacuate.
2. Is the correct extinguisher available?
Never use an extinguisher simply because it is nearby.
3. Do I know how to use it?
Untrained persons should not put themselves at risk.
4. Is my escape route clear?
You should always have a safe exit behind you.
5. Has the alarm been raised?
Fire alarm and emergency notification should not be delayed.
6. Is the environment safe?
Do not approach if there is:
- Heavy smoke.
- Explosion risk.
- Toxic fumes.
- Structural instability.
- Unknown chemicals.
- Rapid fire development.
If the answer to any important safety question is "No," evacuate and raise the alarm.
PASS Method – How to Use a Fire Extinguisher
The commonly taught PASS method is:
P – Pull
A – Aim
S – Squeeze
S – Sweep
P – Pull the Pin
Remove the safety pin or safety device.
This allows the extinguisher to be operated.
Do not waste time trying to use an extinguisher if the fire is already beyond the safe stage.
A – Aim at the Base of the Fire
Point the nozzle or hose toward the base of the fire, not simply toward the flames.
Why?
The fuel is burning at the base.
Directing the extinguishing agent toward the base helps the agent reach the source of combustion.
S – Squeeze the Handle
Squeeze the operating handle to discharge the extinguishing agent.
Maintain control of the extinguisher.
S – Sweep Side to Side
Move the nozzle or hose from side to side across the base of the fire.
Continue until:
- The fire appears extinguished.
- The extinguisher is empty.
- It becomes unsafe to continue.
Always remain alert because the fire can re-ignite.
Simple PASS Example
Imagine a small cardboard fire.
Step 1
Raise the alarm.
Step 2
Select a suitable extinguisher.
Step 3
Keep a clear exit behind you.
Step 4
Pull the pin.
Step 5
Aim at the base.
Step 6
Squeeze the handle.
Step 7
Sweep across the base.
Step 8
Watch for re-ignition.
Step 9
If the fire does not respond quickly, stop and evacuate.
Important Safety Rule
Never allow the fire to come between you and your escape route.
Always maintain a safe position where you can withdraw quickly.
When Should You NOT Use a Fire Extinguisher?
Do not attempt to fight the fire if:
- The fire is large.
- The fire is spreading rapidly.
- The room is filling with smoke.
- Your escape route is blocked.
- You do not have the correct extinguisher.
- You do not know what is burning.
- There is an explosion risk.
- Toxic gases may be present.
- You are not trained or authorized.
- The extinguisher is not functioning properly.
- You feel unsafe.
In such circumstances:
Raise the alarm → Evacuate → Call emergency services / fire response team.
Fire Extinguisher and Electrical Fire
Electrical fires require special care.
Examples:
- Electrical panels.
- Motors.
- Control panels.
- Computers.
- Electrical equipment.
Important
Do not use water on energized electrical equipment where it can create an electrical hazard.
Suitable extinguishing agents may include:
- CO₂.
- Appropriate dry chemical agents.
The extinguisher label and site procedure should always be followed.
Fire Extinguisher and Chemical Warehouse
Chemical warehouses require additional caution.
A warehouse may contain:
- Flammable liquids.
- Chemical powders.
- Flammable packaging.
- Combustible materials.
- Gas cylinders.
- Electrical equipment.
The correct extinguisher depends on the actual material and hazard.
Before attempting firefighting, workers should know:
- Chemical identity.
- SDS information.
- Fire hazard.
- Suitable extinguishing media.
- Emergency procedure.
- Evacuation route.
- Assembly point.
Chemical Fire – Important Precaution
If the chemical involved is unknown:
Do not guess which extinguishing agent should be used.
Check:
- SDS.
- Container label.
- Emergency response procedure.
- Fire team instructions.
Some chemicals can react dangerously with water or other extinguishing agents.
Fire Extinguisher Placement
Extinguishers should be located where they are:
- Easily accessible.
- Clearly visible.
- Properly mounted or positioned.
- Protected from damage.
- Near identified fire hazards.
- Available along suitable access/escape routes.
They should not be blocked by:
- Boxes.
- Pallets.
- Materials.
- Equipment.
- Waste.
Fire Extinguisher Signage
Fire extinguisher locations should be clearly identified.
Signs can help employees quickly locate the equipment during an emergency.
A good fire extinguisher sign should be:
- Clearly visible.
- Easy to understand.
- Positioned appropriately.
- Maintained in good condition.
Fire Extinguisher Inspection
Fire extinguishers should be inspected according to the applicable standard, manufacturer instructions and organization's fire-safety program.
Check for:
- Physical damage.
- Corrosion.
- Leakage.
- Missing pin.
- Damaged hose/nozzle.
- Pressure indicator where applicable.
- Correct location.
- Accessibility.
- Identification label.
- Service status.
- Tampering.
Fire Extinguisher Maintenance
Fire extinguishers require periodic servicing and maintenance.
Maintenance may include:
- Inspection.
- Servicing.
- Recharging after discharge.
- Replacement of damaged components.
- Pressure-related checks where applicable.
- Refilling according to the manufacturer's requirements.
- Hydrostatic or other required testing as applicable.
The frequency and method should follow the applicable standard and competent service requirements.
What Happens After Using an Extinguisher?
Even if only a small amount of extinguishing agent was discharged:
- Inform the responsible person.
- Report the incident.
- Do not simply return the extinguisher to its original position.
- Arrange inspection/recharging/service as required.
- Record the event where required.
A partially discharged extinguisher may not be ready for the next emergency.
Fire Extinguisher Training
Employees should receive suitable fire-safety awareness and practical training according to their role.
Training may cover:
- Fire hazards.
- Fire classes.
- Extinguisher types.
- PASS method.
- Fire alarm procedure.
- Emergency communication.
- Evacuation.
- Assembly point.
- Fire extinguisher limitations.
- When not to fight a fire.
Where practical training is provided, it should be conducted under competent supervision using appropriate training equipment and safe conditions.
Fire Drill vs Extinguisher Training
These are different activities.
Fire Drill
Focuses on:
- Alarm.
- Emergency response.
- Evacuation.
- Assembly.
- Headcount.
- Communication.
Fire Extinguisher Training
Focuses on:
- Fire-extinguisher awareness.
- Extinguisher selection.
- PASS technique.
- Safe use.
- Limitations.
Both can be valuable components of a workplace fire-safety program.
Fire Extinguisher Training – Practical Example
A simple training program may include:
Theory
Explain:
- Fire triangle.
- Fire classes.
- Extinguisher types.
- PASS method.
Demonstration
A competent trainer demonstrates safe operation.
Practical Session
Participants may practice using suitable training equipment under controlled conditions.
Feedback
Trainer explains:
- Correct position.
- Correct aiming.
- Safe withdrawal.
- Common mistakes.
Common Fire Extinguisher Mistakes
1. Aiming at the Flames
Aim at the base of the fire.
2. Using the Wrong Extinguisher
Always check the extinguisher rating and fire type.
3. Fighting a Large Fire
Small incipient-stage fires may sometimes be suitable for extinguisher use. A developed fire requires evacuation and professional response.
4. Standing Too Close
Maintain a safe distance appropriate to the extinguisher and conditions.
5. Blocking the Escape Route
Always keep a safe route behind you.
6. Using Water on an Electrical Fire
This can create a serious electrical hazard.
7. Using Water on Burning Oil
Water can cause violent splashing and spread burning oil.
8. Ignoring Smoke
Smoke can be toxic and can rapidly reduce visibility.
9. Continuing After the Fire Grows
If conditions become unsafe, stop and evacuate.
10. Returning an Empty Extinguisher
A discharged extinguisher must be reported and serviced/replaced as required.
Fire Extinguisher Emergency Procedure
A simple workplace response can be:
Discover Fire
↓
Raise Alarm
↓
Inform Emergency Response Team
↓
Assess Situation
↓
Evacuate if Required
↓
Use Correct Extinguisher Only If Safe
↓
Keep Escape Route Clear
↓
Monitor for Re-Ignition
↓
Evacuate
↓
Report to Responsible Person
↓
Service/Replace Extinguisher
Fire Safety and Assembly Point
If evacuation is required:
Employees should:
- Leave through the designated emergency exit.
- Do not run.
- Do not use unsafe routes.
- Do not return to collect personal belongings.
- Proceed to the designated assembly point.
- Report to the responsible person.
- Follow headcount instructions.
The fire extinguisher should never be used as a reason to delay evacuation.
Fire Safety in a Chemical Warehouse
A chemical warehouse should consider:
- Correct extinguisher selection.
- Fire extinguisher accessibility.
- Fire hydrant systems where applicable.
- Fire alarm/siren.
- Emergency exits.
- Emergency lighting where required.
- Chemical SDS availability.
- Spill response arrangements.
- Emergency contact information.
- Fire marshal/fire response team.
- Assembly point.
- Regular inspection.
- Employee training.
- Mock drills.
The fire-safety arrangement should be based on the actual hazards and applicable requirements.
Fire Extinguisher Selection – Simple Guide
| Fire Hazard | Example | Possible Extinguisher Type* |
|---|---|---|
| Ordinary combustibles | Paper, cardboard, wood | Water / foam / suitable dry chemical |
| Flammable liquids | Solvent, petrol | Foam / dry chemical / suitable CO₂ |
| Flammable gases | LPG, propane | Dry chemical or suitable rated agent |
| Electrical equipment | Panel, motor | CO₂ / suitable dry chemical |
| Cooking oil | Kitchen oil | Wet chemical |
| Combustible metals | Magnesium, sodium | Specialized Class D agent |
*Always follow the extinguisher label, fire classification system, SDS where applicable, manufacturer's instructions and applicable local standards.
Daily Employee Fire Safety Checklist
Employees can check:
☐ Fire extinguisher location is known.
☐ Extinguisher is accessible.
☐ Extinguisher is not blocked.
☐ Fire signage is visible.
☐ Emergency exit is accessible.
☐ Assembly point is known.
☐ Emergency alarm is known.
☐ Emergency contact information is available.
☐ Employee knows the basic PASS method.
☐ Employee understands when NOT to fight a fire.
Fire Extinguisher Inspection Checklist
| Check Point | Status |
| Correct location | OK / Not OK |
| Accessible | OK / Not OK |
| Signage visible | OK / Not OK |
| Physical condition | OK / Not OK |
| Hose/nozzle condition | OK / Not OK |
| Safety pin/seal | OK / Not OK |
| Pressure indicator where applicable | OK / Not OK |
| Service status | OK / Not OK |
| Label readable | OK / Not OK |
| No leakage/corrosion | OK / Not OK |
| No obstruction | OK / Not OK |
The exact inspection criteria and frequency should follow the applicable fire-safety requirements and organizational procedure.
Fire Extinguisher Safety Rules
Remember these basic rules:
- Raise the alarm first.
- Use only the correct extinguisher.
- Keep your escape route clear.
- Aim at the base of the fire.
- Never fight a fire that is too large or unsafe.
- Never use water where it can create an electrical or flammable-liquid hazard.
- Never approach an unknown chemical fire without appropriate information and protection.
- Never allow smoke to trap you.
- Evacuate when conditions become unsafe.
- Report and service every discharged extinguisher.
Personal Experience
From my experience in warehouse safety and ISO management systems, I have found that simply installing fire extinguishers is not enough. Employees should know where the extinguishers are located, which type is available, what type of fire it is intended for, and—most importantly—when they should not attempt firefighting. In a chemical warehouse, this becomes even more important because different chemicals can require different extinguishing media. Fire extinguisher awareness should therefore be connected with HIRA, emergency response procedures, SDS information, fire drills, evacuation arrangements and regular inspections. The objective is not to make every employee a firefighter; the objective is to help employees respond safely to a small fire while ensuring that evacuation and life safety always remain the priority.
Key Learning
- Fire extinguishers are intended for appropriate small/incipient fires.
- Life safety is always the first priority.
- Raise the alarm before attempting firefighting.
- Use the correct extinguisher for the fire hazard.
- Learn the PASS method.
- Aim at the base of the fire.
- Keep an escape route behind you.
- Never fight a fire that is too large or rapidly developing.
- Do not use water indiscriminately on electrical or flammable-liquid fires.
- Chemical fires require consideration of the specific chemical and suitable extinguishing media.
- Fire extinguishers need inspection and maintenance.
- Used extinguishers must be reported and serviced/replaced.
- Employee awareness and practical training improve emergency preparedness.
- Fire extinguisher use should complement, not replace, evacuation and emergency response procedures.
Frequently Asked Questions (FAQ)
Q1. What is the PASS method?
PASS stands for:
P – Pull the pin.
A – Aim at the base of the fire.
S – Squeeze the handle.
S – Sweep from side to side across the base.
Q2. Should I raise the alarm before using a fire extinguisher?
Yes. Raising the alarm and initiating the emergency response should not be delayed.
Q3. Can I use any fire extinguisher on any fire?
No. Extinguishers are designed and rated for specific fire hazards.
Q4. Can water be used on an electrical fire?
Water should not be used on energized electrical equipment where it creates an electrical hazard. Use an extinguisher specifically suitable for the electrical-fire situation.
Q5. Can water be used on burning oil?
No. Water can cause burning oil to spread violently.
Q6. What should I do if the fire becomes larger while I am using the extinguisher?
Stop firefighting, move to safety and evacuate. Follow the site's emergency procedure.
Q7. What if I do not know what chemical is burning?
Do not guess. Evacuate/raise the alarm and allow trained emergency personnel to assess the situation using available chemical and SDS information.
Q8. Can an untrained employee use a fire extinguisher?
Employees should receive appropriate fire-safety awareness and training. A person should only attempt firefighting when it is safe, within their training/competence and consistent with the workplace emergency procedure.
Q9. How far should I stand from a fire?
The safe operating distance depends on the extinguisher type, fire conditions and manufacturer instructions. Maintain a safe distance and follow the extinguisher's instructions.
Q10. What should I do after using an extinguisher?
Report the discharge and arrange inspection, recharge or replacement as required. Do not assume a partially discharged extinguisher is ready for another emergency.
Q11. Why should the extinguisher be aimed at the base?
The base is where the fuel is burning. Applying the extinguishing agent there is generally more effective than simply spraying the visible flames.
Q12. Should I return to the fire after it appears extinguished?
No. Remain alert for re-ignition and follow the emergency response instructions. Do not unnecessarily re-enter a hazardous area.
Q13. What type of extinguisher is suitable for a chemical warehouse?
There is no single answer for every chemical warehouse. The selection should be based on the actual stored materials, fire hazards, extinguisher ratings, SDS information and applicable fire-safety requirements.
Q14. Is fire extinguisher training the same as a fire drill?
No.
A fire drill mainly tests emergency response and evacuation, while extinguisher training teaches safe extinguisher selection and operation.
Conclusion
Knowing how to use a fire extinguisher is an important part of workplace fire-safety awareness.
The basic sequence is:
Recognize Fire
↓
Raise Alarm
↓
Assess the Situation
↓
Select Correct Extinguisher
↓
Keep Escape Route Clear
↓
Pull
↓
Aim
↓
Squeeze
↓
Sweep
↓
Withdraw if Fire Grows or Conditions Become Unsafe
↓
Evacuate
↓
Report & Service the Extinguisher
The most important lesson is:
A fire extinguisher is a tool for controlling a small fire—not a reason to put yourself in danger.
For workplaces such as chemical warehouses, fire response should be supported by:
- HIRA.
- Fire-risk assessment.
- Correct extinguisher selection.
- SDS information.
- Fire alarm.
- Emergency exits.
- Fire marshal/fire response team.
- Emergency communication.
- Assembly point.
- Fire drills.
- Employee training.
- Regular inspection and maintenance.
A safe employee knows not only how to use a fire extinguisher, but also when to stop and evacuate.
Right extinguisher + correct technique + safe escape route + timely alarm = safer fire response.
Discussion
Have you ever received practical fire-extinguisher training at your workplace? Which type of extinguisher is available at your workplace—ABC dry powder, CO₂, foam, water or another type? Share your experience in the comments.
About the Author
Written by Mahesh Chand
Warehouse Safety Professional | Chemical Warehousing | Fire Safety | ISO 9001 & ISO 45001
Mahesh Chand has 12+ years of professional experience in chemical warehousing, industrial safety, warehouse operations, fire prevention, HIRA, risk assessment, emergency preparedness, and ISO management systems. Through Trading Hatke, he shares practical workplace safety knowledge, real industrial experience, and easy-to-understand safety guidance to help safety professionals, students, and organizations build safer workplaces.
📌 Follow Trading Hatke for more practical safety guides, warehouse management tips, and ISO best practices.
Disclaimer: This article is intended for educational and informational purposes only. Firefighting should only be attempted when conditions are safe, the person is appropriately trained/competent, and the workplace emergency procedure permits it. Always follow the extinguisher label, manufacturer's instructions, applicable fire-safety requirements and local emergency procedures.
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