Fire Extinguisher Safety

Fire extinguishers can save lives and property — but only if used by someone trained and only under the right conditions. Most adults have never received formal fire extinguisher training, which can lead to dangerous hesitation or misuse during an emergency.

The Maricopa Fire/Medical Department recommends using a fire extinguisher only if you are trained, confident, and the situation is safe. When in doubt, get everyone out and call 9-1-1.

Types of Fire Extinguishers

Different fires require different extinguishing agents. Using the wrong extinguisher can make a fire worse.

Class A - Ordinary Combustibles

For fires involving cloth, wood, paper, rubber, and plastics.

Class B - Flammable Liquids

For fires involving grease, gasoline, oil, and oil-based paints.

 Class C - Electrical Equipment

For fires involving energized appliances or equipment.

 Class D - Combustible Metals

Used in industrial settings for burning flammable metals.

Class K - Cooking Oils & Fats

For commercial and residential kitchens with oil or grease fires.

Multi-Purpose Extinguishers (A-B-C or B-C)

Common for home use and suitable for multiple fire types.

Before Using a Fire Extinguisher: Ask These Questions

1. Is this the right extinguisher for the type of fire?

A grease fire, electrical fire, and trash fire all require different extinguishers. Using the wrong one is dangerous.

2. Is the fire still small and contained?

A fire extinguisher can be used only on small, early-stage fires, such as a wastebasket fire or a pan fire that has just started. If the fire is spreading or filling the room with smoke, evacuate immediately.

3. Is everyone out, and has someone called 9-1-1?

Never fight a fire alone. Ensure:

• Others are evacuating
• Someone is calling the fire department
• You have a clear escape path

4. Am I safe from toxic smoke?

If the room is filling with smoke or heat is intensifying, you may not have time to fight the fire safely.

5. Do my instincts tell me I can do this safely?

If anything feels unsafe — don’t use the extinguisher. Get out and call 9-1-1.

Who Should Not Use a Fire Extinguisher

Fire extinguishers can be heavy and require strength and coordination. People who may have difficulty using them safely include:

• Older adults
• Children
• Individuals with disabilities or limited strength
• Anyone unfamiliar with how to operate the device

If you're not confident or physically able, evacuate instead of attempting to fight the fire.

Fire Extinguisher Maintenance

Fire extinguishers must be regularly checked to ensure they're ready during an emergency.

Monthly Checks

• Ensure the extinguisher is accessible — not blocked by furniture or storage.
• Confirm the pressure gauge is in the green zone.
• Make sure the nozzle and hose are clear of debris, insects, and damage.
• Inspect for rust, dents, or physical damage.
• Clean the exterior to remove grease or buildup.

Additional Maintenance

• Shake dry chemical extinguishers monthly to prevent powder from packing (follow manufacturer instructions).
• Have extinguishers hydrostatic tested when required by the manufacturer.
• Replace immediately if an extinguisher is damaged or has been used, even partially.

Training Matters

Proper training, routine maintenance, and sound decision-making are all essential for safe fire extinguisher use. Maricopa Fire/Medical Department encourages residents who wish to use extinguishers to seek training in their proper operation and limitations.