Fire Prevention & Firefighting Fundamentals - Revision notes
Master the essential science and tactics every BFP officer needs to understand how fires start, spread, and can be safely extinguished. This comprehensive guide covers fire behavior, prevention principles, firefighting equipment, and tactical operations critical for the BFP entrance examination.
Fire Science - The Fire Tetrahedron
Exam tips
- Memorize all four elements of the fire tetrahedron
- Practice identifying which element is being removed in different suppression methods
- Remember that modern fire science uses the tetrahedron, not the triangle
Key points
- Fire requires four elements: Fuel, Heat, Oxygen, and Chemical Chain Reaction
- Remove any one element and the fire dies - this principle drives all firefighting tactics
- Common fuels include wood, paper, fabric, gasoline, and gas
- Heat must reach ignition temperature to start combustion
- Oxygen from air (21% O₂) sustains the chemical reaction
- Chain reaction maintains continuous combustion process
Definitions
Fire Tetrahedron
The four-sided geometric representation of the four elements required for fire: fuel, heat, oxygen, and chemical chain reaction
Importance
Fundamental concept for understanding fire suppression - remove any element to extinguish fire
Ignition Temperature
The minimum temperature at which a material will ignite and sustain combustion
Importance
Determines fire prevention strategies and suppression methods
Common mistakes
- Forgetting that removing ANY ONE element stops the fire
- Confusing the fire triangle (3 elements) with the fire tetrahedron (4 elements)
- Not understanding that the chemical chain reaction is a separate element
Fire Development Stages
Exam tips
- Learn the characteristics of each stage in sequence
- Understand which stage poses the greatest structural collapse risk
- Remember that backdraft occurs during decay, not growth stage
Key points
- Incipient Stage: Initial ignition, limited fuel involvement, easily extinguished
- Growth Stage: Heat builds, flames spread, smoke increases, temperature rises rapidly
- Fully Developed Stage: Maximum heat release, all available fuel involved, highest danger
- Decay Stage: Fuel exhausted, heat decreases, risk of backdraft if oxygen reintroduced
- Each stage requires different firefighting strategies
- Early detection in incipient stage saves lives and property
Definitions
Backdraft
Explosive reignition of an oxygen-starved fire when air is suddenly introduced
Importance
Critical safety hazard during decay stage - can kill firefighters
Flashover
Sudden simultaneous ignition of all combustible materials in a room
Importance
Marks transition to fully developed stage - extremely dangerous
Common mistakes
- Confusing backdraft with flashover
- Not recognizing signs of each fire stage
- Underestimating dangers of the decay stage
Heat Transfer and Fire Spread
Exam tips
- Create memory aids for each heat transfer mode
- Practice identifying which mode dominates in given scenarios
- Remember examples: conduction (metal), convection (hot air rises), radiation (heat through glass)
Key points
- Conduction: Heat moves through solids (metal beams conducting heat)
- Convection: Hot gases rise (fire spreads upward through stairwells)
- Radiation: Heat emitted as electromagnetic waves (heat through windows)
- Understanding dominant mode helps predict fire spread
- Firefighters must consider all three modes when planning tactics
- Vertical spread often faster than horizontal due to convection
Definitions
Conduction
Heat transfer through direct contact between materials
Importance
Explains how fire spreads through walls and structural elements
Convection
Heat transfer through movement of heated gases and liquids
Importance
Primary cause of upward fire spread and smoke movement
Radiation
Heat transfer through electromagnetic waves without physical contact
Importance
Causes fire to jump gaps and ignite distant materials
Common mistakes
- Confusing the three heat transfer methods
- Not considering all modes when predicting fire spread
- Thinking heat only travels upward
Fire Classification and Extinguishers
Exam tips
- Memorize which extinguisher works on which fire class
- Remember that ABC powder works on Classes A, B, and C
- Practice the PASS acronym until automatic
- Know that water is ONLY for Class A fires
Key points
- Class A: Ordinary combustibles (wood, paper, cloth, rubber)
- Class B: Flammable liquids and gases (gasoline, oil, propane)
- Class C: Energized electrical equipment
- Class D: Combustible metals (magnesium, sodium)
- Class K: Cooking oils and fats (modern kitchen fires)
- NEVER use water on Class B, C, or D fires
- PASS technique: Pull, Aim, Squeeze, Sweep
Definitions
PASS Technique
Proper fire extinguisher operation: Pull the pin, Aim at base of fire, Squeeze handle, Sweep side to side
Importance
Standard method ensures effective extinguisher use and firefighter safety
Common mistakes
- Using wrong extinguisher type for fire class
- Aiming at flames instead of base of fire
- Not using proper PASS technique
- Applying water to electrical or flammable liquid fires
Fire Prevention Principles
Exam tips
- Remember prevention is more effective than suppression
- Learn the top fire causes in the Philippines
- Understand that prevention involves multiple strategies, not just one
Key points
- Eliminate ignition sources (cigarettes, electrical faults, cooking)
- Control fuel loads (reduce flammable storage, proper waste disposal)
- Provide early warning systems (smoke detectors, fire alarms)
- Enable quick suppression (extinguishers, sprinklers)
- Plan evacuation routes (marked exits, emergency lighting)
- Public education and fire safety awareness
- Regular inspections and maintenance
Definitions
Fire Load
The amount of combustible material present in a given area
Importance
Higher fire loads create greater fire hazards and require enhanced protection
Means of Egress
Continuous and unobstructed path of exit travel from any point in a building to a public way
Importance
Critical for life safety - must be maintained clear and well-marked
Common mistakes
- Focusing only on suppression instead of prevention
- Ignoring the importance of housekeeping in fire prevention
- Not considering all potential ignition sources
Philippine Fire Statistics and Common Causes
Exam tips
- Memorize the top three fire causes in order
- Understand why electrical fires are so common in the Philippines
- Consider local factors like informal settlements and older infrastructure
Key points
- Faulty electrical wiring - leading cause of fires
- Unattended cooking - second leading cause
- Lit cigarettes - third leading cause
- Open flames (candles, lamps)
- Children playing with matches
- Lightning strikes
- Pyrotechnics during festivals
- Arson - significant in some areas
Definitions
Electrical Fire Hazard
Fire risk created by faulty wiring, overloaded circuits, or damaged electrical equipment
Importance
Leading cause of structural fires in the Philippines requiring special attention
Common mistakes
- Not knowing the leading causes specific to the Philippines
- Underestimating electrical hazards in older buildings
- Ignoring cultural factors like pyrotechnics use
Firefighting Equipment and Tactics
Exam tips
- Learn the primary function of each apparatus type
- Understand when to use direct vs. indirect attack
- Remember that premature ventilation can worsen fire conditions
Key points
- Engine (pumper): carries water and pump for hose operations
- Ladder truck: aerial access for rescue and ventilation
- Tanker: water supply for areas without hydrants
- Direct attack: water applied directly to flames
- Indirect attack: water on superheated surfaces converts to steam
- Ventilation: removes heat and smoke, improves visibility
- Search and rescue: primary and secondary searches
- Overhaul: checking for hidden fire after main fire controlled
Definitions
Ventilation
The systematic removal of heated gases, smoke, and vapors from a burning building
Importance
Improves visibility, reduces heat, and facilitates firefighting operations
Overhaul
The process of searching for and extinguishing hidden fires after the main body of fire is controlled
Importance
Prevents rekindling and identifies evidence for fire investigation
Common mistakes
- Confusing direct and indirect attack methods
- Not understanding the purpose of ventilation
- Forgetting the importance of overhaul operations
Personal Protective Equipment and Safety
Exam tips
- Know all components of structural firefighting PPE
- Understand the purpose and operation of SCBA
- Remember that PASS device saves firefighter lives
Key points
- Structural PPE: helmet, hood, bunker coat/pants, gloves, boots, SCBA
- SCBA (Self-Contained Breathing Apparatus) mandatory in toxic atmospheres
- PASS device (Personal Alert Safety System) sounds alarm if firefighter motionless
- Wildland PPE lighter but includes fire shelter for last resort
- PPE must be properly maintained and inspected regularly
- Never enter hazardous atmosphere without full PPE
- Two-in, two-out rule for interior operations
Definitions
SCBA
Self-Contained Breathing Apparatus that provides clean air supply independent of surrounding atmosphere
Importance
Essential for firefighter survival in toxic smoke and oxygen-deficient environments
PASS Device
Personal Alert Safety System that automatically sounds alarm if firefighter becomes motionless
Importance
Critical safety device for locating down or trapped firefighters
Common mistakes
- Thinking PPE is optional in any fire situation
- Not understanding SCBA limitations and air supply duration
- Failing to activate PASS device before entering structure
Connections
- Fire science principles connect to building construction and how structures fail under fire conditions
- Heat transfer modes relate to building ventilation systems and fire spread patterns
- Fire classification systems link to hazardous materials identification and specialized suppression methods
- Prevention principles connect to fire codes, inspection procedures, and public education programs
- Firefighting tactics relate to incident command systems and emergency management
- PPE requirements connect to occupational safety standards and firefighter health programs
- Fire investigation principles link to legal procedures and arson prosecution
- Emergency medical services connect to trauma care and mass casualty incidents
Quick review questions
What are the four elements of the fire tetrahedron?
Answer
Fuel, Heat, Oxygen, and Chemical Chain Reaction
All four elements must be present for fire to exist. Remove any one element and the fire will be extinguished.
Which fire stage has the highest risk of backdraft?
Answer
Decay stage
During decay, fuel is exhausted and oxygen levels are low. Suddenly introducing oxygen can cause explosive reignition.
What does the 'A' in PASS technique stand for?
Answer
Aim at the base of the fire
Aiming at the base attacks the fuel source. Aiming at flames is ineffective and wastes extinguishing agent.
What is the leading cause of fires in the Philippines?
Answer
Faulty electrical wiring
Electrical problems cause more fires than any other single factor, especially in older buildings with poor wiring.
Which heat transfer method causes fire to spread upward through stairwells?
Answer
Convection
Hot gases and smoke rise naturally, carrying heat upward through vertical openings like stairs and elevator shafts.
What type of extinguisher should NEVER be used on Class C fires?
Answer
Water
Water conducts electricity and can electrocute the operator when used on energized electrical equipment.
Diagrams
Fire Prevention & Firefighting Fundamentals Overview
Comprehensive overview showing the interconnected concepts of fire prevention and firefighting fundamentals
Fire Development Stages and Hazards
Shows the progression of fire stages and critical decision points where hazards like flashover and backdraft occur
PASS Fire Extinguisher Technique
Step-by-step process for proper fire extinguisher operation using the PASS technique
Leading Causes of Fires in the Philippines
Distribution of fire causes showing electrical wiring as the leading hazard requiring prevention focus
Exam strategy
Focus heavily on memorizing the fire tetrahedron, fire stages, and classification systems as these appear frequently on BFP entrance exams. Practice identifying fire causes and matching appropriate extinguisher types to fire classes. Understand the three heat transfer methods and be able to give examples of each. Know the leading causes of fires in the Philippines and basic prevention principles. For practical applications, master the PASS technique and understand when different firefighting tactics are appropriate. Pay special attention to safety concepts like backdraft, flashover, and PPE requirements as these are critical for firefighter survival.