Fire Service Manual Volume 2 Fire Service Operations - compartment fires and tactical ventilation

Authority: Issued under the authority of the Home Office (Fire and Emergency Planning Directorate).
Manual: Volume 2, focusing on Fire Service Operations, specifically on Compartment Fires and Tactical Ventilation.
Publication Details: Part of educational resources provided by HM Fire Service Inspectorate.

Purpose: This manual replaces previous publications related to compartment fires and tactical ventilation, updating key information based on the latest practices and research.
Content Structure:
- Part 1: Covers Compartment Fires.
- Part 2: Discusses Tactical Ventilation.
Foundational Learning: This manual supports understanding for firefighters on how to effectively handle fires in enclosed spaces, leading to better safety and operational efficiency.

Combustion Process: Initial combustion involves fuel generating flammable gases when heated; these gases rise and, if mixed with oxygen in the right ratio, ignite.
Thermal Radiation: Produced during combustion, this helps further ignite surrounding materials, causing the fire to spread.
Cooling Effect of Water: Upon application, water vaporizes and absorbs heat, effectively cooling the combustion gases and limiting fire growth when applied correctly.

Positioning during Firefighting: Firefighters are advised to stay low to avoid contact with hot gases and to improve operational visibility.
Safety Precautions: Precautious measures must be in place to deal with the risk of backdrafts and flashovers during fires.

Ventilation Goals: The removal of heated air and smoke from a structure, replaced with fresh air, to enhance firefighter operations and victim extraction.
Types of Ventilation:
- Natural Ventilation: Using existing airflow paths (windows, doors).
- Tactical Ventilation: Fire service intervention to control airflow and improve fire conditions.

Operational Safety: Reduces risks of backdraft and flashover, enhancing safety for firefighters.
Search and Rescue: Improves visibility and reduces toxic smoke, aiding rescue efforts for trapped occupants.
Fire Control: Facilitates a quicker and more effective firefighting by removing heat and smoke, allowing earlier entry into hazardous environments.

Vertical Ventilation: An opening is made at the roof level to allow hot gases to escape while drawing in fresh air from lower levels (
- Effective in high-rise fires where hot gases tend to accumulate at ceiling levels.
Horizontal Ventilation: Entry points are established at the building's sides to facilitate the movement of smoke and gases out while letting fresh air in.
Positive Pressure Ventilation (PPV): Fans are used to increase pressure inside the building, pushing out smoke and hot air while drawing in fresh air; important in large spaces.

Definition: A backdraft occurs when an oxygen-limited fire suddenly receives fresh air, leading to a rapid and violent ignition of flammable gases accumulated in the compartment.
Signs of Potential Backdraft:
- Dense smoke with no signs of flames.
- Smoke stains on windows, pulsing smoke from openings, and heat indications on door handles.

Definition: When the entire room ignites almost simultaneously due to a significant buildup of hot smoke and gases, leading to a substantial increase in heat.
Indicators: Rapid rise in temperature, visible flames in smoke layers, and other surfaces igniting.

Part 1: Analyzes compartment fire dynamics, firefighter awareness, effects of water, and critical tactics for safe engagement.
Part 2: Focuses on ventilation strategies, discussing horizontal and vertical techniques, equipment application, and senior officer command decisions for safe and effective operations.

Firefighters should apply ventilation judiciously, balancing safety and effectiveness.
Key principles and continual communications are essential for success in firefighting.
Both offensive and defensive tactics must consider the fire’s location and existing conditions to mitigate risks effectively.