Fires are classified based on their fuel into Class A, B, and D. Class A fires involve solid organic materials like wood and paper. Class B fires involve flammable liquids. Different types of extinguishers like water, dry chemical powder, foam, and carbon dioxide can be used to extinguish different classes of fire. Foam extinguishers work on both Class A and B fires by creating an air foam blanket that cuts off oxygen and prevents vapors from fuels.

1. FIRE SAFETY :
Fire is a rapid chemical reaction
of oxidant with fuel accompanied
by the release of energy, indicated
by incandescence or flame.

2.  On the basis of the type of fuel, fires are
classified into the following
 Class A Fires — solid combustible materials
of organic nature such as wood, paper,
rubber, plastics, etc.
 Class B Fires — flammable liquids

3.  Type of extinguishers and the classes of fire
for which they can be used
 Water- Class A fire Dry
 chemical powder- Class B
 fire Foam- Class A & B
 fire Carbon dioxide- Class B & C
 fire Special dry powder- Class D fire

4.  • The extinguishing agent is aqueous film
forming concentrate in water which forms
air foams when discharged through
an aspirating nozzle.
• It has a blanketing effect excluding oxygen
from the surface of the fuel as it spreads on
the fuel.
• Prevents vapour formation from the surface
of the burning liquid


5.  National Safety Academy - Branch Office
239/1 Rohini Flats,
Anna Nagar West Extension,
Chennai - 600 101.
Phone : 7550075215
Email : info@safetyacademy.in