Definition & Operational Usage of Positive Pressure Attack
What Is Positive Pressure Attack?
Coordinating high-velocity fans applied at the entry point with rapid fire stream application, this tactic pressurizes the structure to force heat and smoke out ahead of the hose team.
⚠️ Operational Safety Warning:Failure to secure an adequate exhaust opening before pressurization will blow fire directly onto the interior attack crew.
Why Positive Pressure Attack Matters on the Fireground
Drastically improves visibility, drops temperatures for the attack crew, and prevents flashover if executed flawlessly.
Relevant NFPA Standards
- NFPA 1010: Standard on Professional Qualifications for Firefighters
- NFPA 1550: Standard for Emergency Responder Health and Safety
Field Procedures & Tactical Steps
- Locate and isolate the seat of the fire.
- Create an exhaust opening near the fire room (1.5x inlet size).
- Position the PPV fan 4-6 feet from the entry door.
- Start the fan and confirm outflow at the exhaust.
- Advance the charged hoseline rapidly to extinguish.
Common Context & Application
Single-family residential fires with clearly defined exhaust paths.
Frequently Asked Questions about Positive Pressure Attack
What is the inlet to exhaust ratio?
Exhaust should be at least 1.5 to 2 times the inlet.
Can this be used on balloon frame homes?
High risk; it may push fire into hidden voids.
Other Names for Positive Pressure Attack
Positive Pressure Suppression
Positive Pressure Attack may also appear in training materials, NFPA standards, or department SOPs as: Positive Pressure Suppression.
Relevant Tools
Operational calculators related to Positive Pressure Attack:
Category:Fireground Operations
— Core tactics, command, suppression, ventilation, search, and water supply terminology used on the fireground.