PPV Attack Assignment PDF

RIVERSIDE FIRE AUTHORITY FIELD OPERATING GUIDELINES PPV ATTACK ASSIGNMENT PLACEMENT OF FANS  Positive pressure fans should be placed at the point of entry(s) from the unburned side of...

RIVERSIDE FIRE AUTHORITY FIELD OPERATING GUIDELINES PPV ATTACK ASSIGNMENT PLACEMENT OF FANS  Positive pressure fans should be placed at the point of entry(s) from the unburned side of the fire and should be coordinated with the deployment of the attack line.  Fans should be positioned 12-15 feet back from the entry point. The objective is to create a pressure “cone” effect around the door. This position will also allow access for crews to enter the building.  Where additional fans are required, placing two or more fans in “tandem”—one behind the other is more effective than side by side. TACTICAL CONSIDERATIONS Positive pressure ventilation is effective only when applied properly. Two major items are required:  An “exit” for the pressurized air must be provided and must be located in the fire area. This is generally a window, door or other opening. This exit should be approximately 75% or less the size of the inlet.  Positive pressure ventilation must be injected from the unburned side of the fire. It will be the company officers responsibility to ensure that these two requirements are completed prior to injecting positive pressure into the structure. CONTROLLING AIR FLOW  Air flow from PPV must be controlled throughout the operation. Too many openings or exit points reduce the effectiveness of PPV. In some cases, windows and doors that are already open may need to be closed to direct the air flow into the fire area, or the most densely affected smoke area. As one area is cleared of smoke, that area may need to be sealed off and another exit created in another area of the structure to direct the air flow into the next area to clear. CONTRAINDICATIONS  Unknown Location of Fire  Attic Fire  Rescue Situation Similar to unknown location, this may push fire onto occupants or into occupant escape paths.  Inadequate Exhaust No one made an exhaust opening. This is like bellows to a fireplace.  Building is Over Pressurized already (i.e. FULL of smoke) You have a building full of fuel and heat, but displaced O2. All it needs is O2 from a fan