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Questions and Answers
Class ___ fires involve wood and wood products, cloth, textiles and fibrous materials, paper and paper products.
Class ___ fires involve wood and wood products, cloth, textiles and fibrous materials, paper and paper products.
A
Class ___ fires involve flammable liquids such as gasoline, diesel fuel, hydraulic fluid and lube oil.
Class ___ fires involve flammable liquids such as gasoline, diesel fuel, hydraulic fluid and lube oil.
B
Class ___ fires are energized electrical fires that are attacked at prescribed distances using nonconductive agents such as CO2 or water fog.
Class ___ fires are energized electrical fires that are attacked at prescribed distances using nonconductive agents such as CO2 or water fog.
C
Class ___ fires involve combustible metals such as magnesium, lithium hydride, sodium, and others.
Class ___ fires involve combustible metals such as magnesium, lithium hydride, sodium, and others.
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Study Notes
Class A Fires
- Involve solid combustible materials: wood, cloth, textiles, paper products.
- Extinguished primarily with water, preferably in a fog pattern.
- For deep-seated fires, Aqueous Film Forming Foam (AFFF) is more effective than seawater.
- AFFF serves as a wetting agent, penetrating materials to extinguish fires rapidly.
Class B Fires
- Comprised of flammable liquids like gasoline, diesel, hydraulic fluid, and lube oil.
- Extinguished using AFFF, Potassium Bicarbonate, or water.
- Includes flammable gases; these should only be extinguished when gas flow can be secured.
Class C Fires
- Involve energized electrical sources, necessitating nonconductive extinguishing agents like CO2 or water fog.
- The ideal approach is to de-energize the source first and treat the fire as a Class A fire.
- Clean agents such as CO2 are preferred for situations where cleanup is a concern.
Class D Fires
- Consist of combustible metals: magnesium, lithium hydride, sodium, potassium, aluminum, zinc, titanium, zirconium, and iron.
- Caused by heat sources leading to ignition, often without visible flames, and may react violently with water.
- Firefighting strategies differ based on the specific metal involved; generally, direct fighting is avoided, with recommendations to jettison burning materials overboard.
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