Definition & Operational Usage of Positive Pressure Ventilation
What Is Positive Pressure Ventilation?
Deploying high-CFM gas or electric blowers 4 to 6 feet from an exterior doorway to create a pressure cone that forces smoke out of a designated exhaust opening.
⚠️ Operational Safety Warning:Initiating PPV prior to fire knockdown can feed oxygen to a smoldering fire, triggering a wind-driven blowout.
Why Positive Pressure Ventilation Matters on the Fireground
Systematically clears smoke, reducing ambient temperatures and improving victim survivability and rescuer visibility.
Relevant NFPA Standards
- NFPA 1010: Standard on Professional Qualifications for Firefighters
- NFPA 1550: Standard for Emergency Responder Health and Safety
Field Procedures & Tactical Steps
- Ensure the fire is officially declared under control.
- Open a designated exhaust window (ideally on the leeward side).
- Position the fan so the cone of air completely seals the inlet door.
- Run the fan at maximum RPM.
- Systematically open and close interior doors to clear one room at a time.
Common Context & Application
Post-knockdown overhaul and smoke clearance operations.
Frequently Asked Questions about Positive Pressure Ventilation
What is the cone of air?
The pressurized airflow that seals the doorway to prevent pressure loss.
Why clear one room at a time?
It concentrates the pressure for faster, more effective clearing.
Other Names for Positive Pressure Ventilation
PPVmechanical ventilationforced ventilation
Positive Pressure Ventilation may also appear in training materials, NFPA standards, or department SOPs as: PPV, mechanical ventilation, forced ventilation.
Relevant Tools
Operational calculators related to Positive Pressure Ventilation:
Category:Fireground Operations
— Core tactics, command, suppression, ventilation, search, and water supply terminology used on the fireground.