Fire safety isn’t just a legal obligation—it’s a lifeline for workers.
Fire extinguishers are a first line of defense, but only if they’re the right type, properly maintained, and employees know how to use them.
Every year, 16,000+ commercial building fires in the U.S. cause approx. $1 billion in property damage. Surprisingly, 32% of non-residential fires occur in offices, with cooking equipment the number one cause. For workers, these aren’t just statistics – they’re daily risks.
As a worker, safety officer, HR professional, or employer, ensuring proper fire extinguisher selection, usage, and maintenance can save lives and prevent costly damage in your workplace.
Here, we’ll break down the types of fire extinguishers (U.S. standards), color codes and labels for quick identification, how to use extinguishers (PASS technique), and best maintenance practices to stay OSHA-compliant.
Let’s dive in.
Related Article: Major Retail Chain Fined $2.7 Million
Related Article: 7 Key Steps to Prevent Workplace Chemical Fires
1. Why Workers Need This Guide
While there’s no shortage of reasons to train employees on fire safety, consider just a few of the following:
Your Life Depends on It
– According to ESFI, electrical fires cause 5.6% of workplace fatalities, often due to improper extinguisher use.
– According to U.S FEMA, 60% of home fire deaths could be prevented with working alarms and trained responses to flames. This shows that fire alarms and training in the workplace are also critical skills.
See OSHA’s Guideline on Fire Protection and Prevention.
OSHA Compliance Isn’t Optional
– OSHA mandates monthly visual inspections of fire extinguishers, as well as annual training. If a workplace fire breaks out, an expired extinguisher or panicking worker can make a bad situation even worse.
Small Actions Save Lives
– Knowing the difference between types of extinguishers and the fires they’re designed to put out is critical. For instance, a grease fire and an electrical fire require two different types of extinguishers to effectively snuff out the flames. (More on that, below.)
– A blocked extinguisher or expired CO2 tank could be the difference between containment and catastrophe. A quick, visual examination is all it takes ensure proper equipment is available at all times.
2. Types of Fire Extinguishers (and Which Ones Your Workplace Needs)
Not all fires are the same—and neither are fire extinguishers.
The U.S. follows NFPA 10 standards, classifying extinguishers by the type of fire they combat:
Class A: Ordinary Combustibles
– These Fires Involve: Wood, paper, cloth, or trash.
– Best Extinguishers: Water, foam, or ABC dry chemical.
– Commonly Occur In: Offices, warehouses, schools.
Class B: Flammable Liquids & Gases
– Fires Involve: Gasoline, oil, solvents, propane, etc.
– Best Extinguishers: CO2, dry chemical (BC or ABC), or foam.
– Commonly Occur In: Factories, labs, or garages.
Class C: Electrical Fires
– Fires Involve: Live electrical equipment.
– Best Extinguishers: CO2 or dry chemical (non-conductive).
– Commonly Occur In: Computer server rooms, workshops, offices with faulty wiring.
Class D: Combustible Metals
– Fires Involve: Magnesium, sodium, titanium.
– Best Extinguishers: Dry powder (specialized, not standard dry chemical).
– Commonly Occur In: Metalworking facilities & chemical plants.
See OSHA’s Fact Sheet for Shipyard Employment: Fire Watch Duties during Hot Work.
Class K: Kitchen Fires
– Fires Involve: Cooking oils, grease.
– Best Extinguishers: Wet chemical (creates a cooling foam).
– Commonly Occur In: Restaurants, cafeterias, break rooms with deep fryers.
See OSHA’s Guideline for Young Worker Safety in Restaurants: Cooking
3. Fire Extinguisher Color Codes (Quick Identification)
In the U.S., extinguishers follow NFPA color-coding for easy recognition. Here’s how it breaks down:
Classification of Fire Extinguishers (based on color and usage)
– Water: Color Red, for Class A fires only.
– Foam: Cream, for Class A & B fires.
– Dry Chemical (ABC): Blue, for Class A, B, C fires.
– CO2: Black, for Class B & C fires.
– Wet Chemical: Yellow, for Class K (kitchens) fires.
– Dry Powder (Class D): White, for Class D (metal) fires.
In a case of an emergency, workers need to quickly identify the right extinguisher.
When employees are properly trained, this color coding helps reduce confusion in times of stress.
See OSHA’s Fire extinguisher requirements of Hazard Communication Standard.
4. How to Use a Fire Extinguisher (PASS Technique)
Even the best extinguishers can’t function properly if employees don’t know how to operate them.
Train staff using the PASS method:
Pull the pin (breaks the tamper seal).
Aim at the base of the fire (not the flames).
Squeeze the handle slowly.
Sweep side to side until the fire is out.
Key Reminders:
– Only fight small, contained fires. If the fire spreads, evacuate immediately.
– Always position yourself between the fire and an exit — never let flames block your escape.
Training Tip:
– Conduct hands-on fire drills annually so employees can practice PASS in a controlled setting.
5. Fire Extinguisher Maintenance & OSHA Compliance
A neglected extinguisher can fail in an emergency. Follow these OSHA and NFPA maintenance guidelines:
A. Monthly Inspections
– Pressure gauges should read within the green zone.
– Check for physical damage (no dents, rust, or leaks).
– Ensure the pin and seal remain intact (to prevent accidental discharge).
– Make sure extinguishers are accessible & unobstructed (nothing blocking it).
B. Annual Professional Inspection
Every year, a certified technician should:
– Check internal pressure.
– Verify nozzle condition.
– Recharge if needed.
As a side note, you’ll also want to maintain accurate records of your inspections, whether monthly or the more thorough annual inspections. In the event of an OSHA audit, these maintenance logs can go a long way towards avoiding any citations or penalties.
See OSHA’s Emergency Standards For Portable Fire Extinguishers.
6. Best Practices for Workplace Fire Safety
The following are the approved best practices for workplace fire safety:
A. Place Extinguishers Strategically Around the Workplace
– Near exits, high-risk areas (kitchens, electrical panels).
– Maximum travel distance: 75 feet for Class A/B hazards.
See OSHA Standard for Portable Fire Extinguishers (1910.157).
B. Train Employees Annually In Fire Safety
– Cover the types of fires, PASS method, and evacuation routes.
C. Know When NOT to Fight a Fire
– If the fire is very large, spreading rapidly, or in danger of blocking any exits, evacuate and call 911. Knowing when to not fight a fire is just as important as knowing how to.
Action Steps for Employers & Safety Officers
– Audit your extinguishers: are they correctly placed and labeled?
– Schedule training: refresh employees on the PASS technique.
– Inspect monthly: this helps avoid OSHA violations and ensure readiness.
Key Takeaways
Workplace fire safety isn’t just an employer’s responsibility. It’s also a worker’s right and duty. Workers should actively report missing or faulty fire extinguishers and insist on proper equipment like Class K extinguishers in kitchens.
Training is essential, as only a small percentage feel confident using extinguishers, yet hands-on training is legally required. Importantly, workers must know when to evacuate—if a fire grows beyond a small size, leaving immediately is crucial.
With proper training, workers can achieve a high success rate in extinguishing fires, highlighting the critical difference that informed, prepared employees can make in workplace safety.
By taking these steps, you’ll create a safer workplace and reduce fire risks effectively.
Stay In Compliance With Worksite Medical
In most cases, OSHA requires medical surveillance testing, and at no cost to employees.
Worksite Medical makes that program easier with mobile medical testing.
We conduct silica exam physicals, on-site respirator fit tests (including N95 masks), audiometric exams, pulmonary function tests, heavy metal lab work, and much more, right on your job site.
We also keep accurate, easy-to-access medical records for your convenience. You’ll keep your employees at work, and stay ahead of OSHA inspections.
With Worksite Medical, a mobile medical testing unit — we can bring all the resources of a lab to you. Our certified lab technicians can perform both qualitative and quantitative respirator tests to ensure a perfect fit.
You’ll keep your employees at work, and stay ahead of OSHA and MSHA inspections.
Protect your team and your workplace now with Worksite Medical. Not sure what you need? Try our medical testing wizard here.
Give us a call at 1-844-622-8633, or complete the form below to schedule an on-site visit or to get your free quote.
Convenient, Compliant Occupational Medicine. Worksite Medical – Let Us Come to You!
