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Questions and Answers
Portable fire extinguishers are classified according to the?
Portable fire extinguishers are classified according to the?
Place where they are designed to extinguish
A portable fire extinguisher must be labeled with the?
A portable fire extinguisher must be labeled with the?
Letters and/or symbols that designate its class rating
How would a fire containing plastics be classified?
How would a fire containing plastics be classified?
Class A
Class A portable fire extinguishers are rated from 1-A through 40-A based upon the amount of water and?
Class A portable fire extinguishers are rated from 1-A through 40-A based upon the amount of water and?
Which material is Class B fuel?
Which material is Class B fuel?
Which type of extinguishing agent is used to extinguish a Class B fire?
Which type of extinguishing agent is used to extinguish a Class B fire?
Which statement about Class C fires is accurate?
Which statement about Class C fires is accurate?
_____ is an example of a Class D fuel.
_____ is an example of a Class D fuel.
Which extinguishing agent should be used for a Class D fire?
Which extinguishing agent should be used for a Class D fire?
When an extinguishing agent is determined to be safe and effective for use on combustible metals, it will?
When an extinguishing agent is determined to be safe and effective for use on combustible metals, it will?
Class K fires involve?
Class K fires involve?
Class K rated extinguishers work because of _______, which converts fatty acids into a soapy film.
Class K rated extinguishers work because of _______, which converts fatty acids into a soapy film.
Which method of extinguishment excludes oxygen from the burning process?
Which method of extinguishment excludes oxygen from the burning process?
How does chemical flame inhibition work to extinguish fire?
How does chemical flame inhibition work to extinguish fire?
A ______ extinguisher requires the operator to apply pressure to a pump that increases pressure within the container and forces the agent out of the nozzle.
A ______ extinguisher requires the operator to apply pressure to a pump that increases pressure within the container and forces the agent out of the nozzle.
Pump-type water extinguishers are intended primarily for use on?
Pump-type water extinguishers are intended primarily for use on?
Stored-pressure water extinguishers are used on Class _____ fires.
Stored-pressure water extinguishers are used on Class _____ fires.
What do manufacturers sometimes add to stored-pressure water extinguishers in order to increase their effectiveness?
What do manufacturers sometimes add to stored-pressure water extinguishers in order to increase their effectiveness?
On which type of fires are stored-pressure water-mist extinguishers safe and effective to use?
On which type of fires are stored-pressure water-mist extinguishers safe and effective to use?
Wet chemical stored-pressure extinguishers are intended for use on ___ fires.
Wet chemical stored-pressure extinguishers are intended for use on ___ fires.
Which extinguisher would be effective for use on a burning puddle of gasoline at a vehicle incident?
Which extinguisher would be effective for use on a burning puddle of gasoline at a vehicle incident?
The air-aspirating foam nozzle used with an aqueous film forming foam (AFFF) extinguisher produces?
The air-aspirating foam nozzle used with an aqueous film forming foam (AFFF) extinguisher produces?
Where would a clean agent extinguisher likely be used?
Where would a clean agent extinguisher likely be used?
What is a characteristic of a carbon dioxide (CO2) extinguisher?
What is a characteristic of a carbon dioxide (CO2) extinguisher?
In which situation would a dry chemical extinguisher be most effective?
In which situation would a dry chemical extinguisher be most effective?
Which statement about dry chemical extinguishers is accurate?
Which statement about dry chemical extinguishers is accurate?
When applying a dry powder agent, it is important to?
When applying a dry powder agent, it is important to?
When selecting the appropriate type of portable fire extinguisher to use for a situation, it is important to consider?
When selecting the appropriate type of portable fire extinguisher to use for a situation, it is important to consider?
A ____ extinguisher should be used in areas with highly sensitive computer equipment because it will cause less damage to the equipment than other extinguishers.
A ____ extinguisher should be used in areas with highly sensitive computer equipment because it will cause less damage to the equipment than other extinguishers.
What should be the next step after choosing the appropriate fire extinguisher for a fire?
What should be the next step after choosing the appropriate fire extinguisher for a fire?
When operating a portable fire extinguisher, it is safest to approach the fire?
When operating a portable fire extinguisher, it is safest to approach the fire?
What is the first step in the PASS application method of operating a portable fire extinguisher?
What is the first step in the PASS application method of operating a portable fire extinguisher?
When operating a portable fire extinguisher?
When operating a portable fire extinguisher?
Which statement about using a portable fire extinguisher on an incipient stage fire is accurate?
Which statement about using a portable fire extinguisher on an incipient stage fire is accurate?
What action should be taken if an entire extinguisher is discharged but the fire is not extinguished?
What action should be taken if an entire extinguisher is discharged but the fire is not extinguished?
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Study Notes
Portable Fire Extinguishers
- Classified based on the type of fire they are designed to extinguish.
- Must display letters/symbols indicating class rating for clear identification.
Fire Classifications
- Class A fires involve ordinary combustibles like plastics and wood.
- Class B fires include flammable liquids, such as gasoline.
- Class C fires pertain to fires involving electrical equipment and may revert to Class A or B once power is disconnected.
- Class D fires involve combustible metals, such as magnesium.
- Class K fires are related to cooking oils.
Extinguishing Agents
- Class A extinguishers are rated 1-A to 40-A based on water effectiveness in tests.
- Carbon dioxide is the effective agent for Class B fires.
- Dry powder is used specifically for Class D fires.
- Class K extinguishers utilize saponification to turn fatty acids into a soapy film for effective suppression.
- Clean agents are useful in sensitive environments like computer rooms as they minimize damage.
Operating Procedures
- Smothering is an effective method that excludes oxygen from the fire.
- Chemical flame inhibition interrupts the chemical chain reaction, aiding in fire suppression.
- Manual pump extinguishers require user-operated pressure to expel the agent.
Specific Extinguisher Types
- Stored-pressure water extinguishers target Class A fires, sometimes enhanced with Class A foam for better effectiveness.
- Wet chemical stored-pressure extinguishers are designated for Class K fires.
- Aqueous Film Forming Foam (AFFF) extinguishers are suitable for gasoline-related incidents.
Important Considerations
- Examine the class of fuel burning to select the proper extinguisher.
- Ensure extinguishers are charged and operational before use.
- Approach fires with wind at your back for safety.
- Follow the PASS method: Pull the pin, Aim the nozzle, Squeeze the handle, and Sweep side to side.
Safety Precautions
- Be cautious as dry chemical particles may scatter during application.
- Avoid breaking through any crust formed on burning materials when using a dry powder agent.
- If a discharged extinguisher fails to extinguish the fire, withdraw and reassess the situation.
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