What Exactly is a Fire?
These are the elements of a fire: Oxygen, heat, and a fueling agent.
You need to take one of those elements out of the equation to stop the fire.
Every fire can’t be put out with water.
Different types of fires need different types of extinguishers.
- Displaces the oxygen molecules, so it cannot take part in the burning process
- Water carries away heat from the fire in the form of steam, lowering the temperature
- Smothers fires and prevents supply of oxygen
- The water-based foam cools the burning material’s temperature
- Smothers the fire and separates fuel from oxygen
- Covers surface area of fire and absorbs the heat
- NOT the same as dry chemical!
- Interrupts chemical process of fire
- Mostly for Class B fires (oil, gas, liquids)
- Colorless, odorless gas that sucks the oxygen out of an area
- Extremely DANGEROUS should only be used in facility void of humans and animals, or not at all
- Disrupts the chemical process of fire
- Example includes Halon and FM-200
Types of Fires
Class A – Combustibles
Suppression: Dry powder, water, foam
Class B – Liquids
Suppression: Dry chemical, dry powder, foam, CO2, gas
Class C – Electrical
- Electrical equipment
Suppression: Dry powder, CO2, gas
Class D – Metals
Suppression: Dry powder only, everything else may aid in spreading the fire
Class K – Kitchen Liquids
- Cooking oils
Suppression: Potassium Acetate