PPV

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Questions and Answers

What should be done if the initial fire attack crew cannot access the fire and apply water within 2 minutes after entry?

Shut down the fan or turn it away from the entry port. (correct)

Increase the fan speed to force entry quicker.

Send more personnel to help operate the fan.

Continue operating the fan without shutting down.

When should continuous positive pressure ventilation (PPV) not be operated?

When it is determined that PPV is needed for offensive firefighting.

Whenever there are concealed spaces like sub-floors and walls.

When water is being applied to the fire.

If the location of the fire is unknown and water is not being applied to the fire. (correct)

What is the responsibility of the company officer regarding positive pressure ventilation (PPV) before entry?

Directing all interior crews to exit the structure.

Checking that PPV is functioning effectively. (correct)

Verifying that all fire hydrants are accessible.

Ensuring all windows are properly closed.

What benchmark must be met before initiating PPV operations on the fire ground?

Announcing an offensive fire with PPV operation. Signup and view all the answers

What is the main purpose of positive pressure ventilation (PPV) during structural fire operations?

To rapidly remove heat and smoke from the building Signup and view all the answers

How does PPV benefit search and rescue operations?

By improving atmosphere and visibility for firefighters Signup and view all the answers

What should all fire department personnel do in relation to the PPV procedure?

Follow it as a responsibility Signup and view all the answers

What is the risk associated with misapplied PPV by a Firefighter?

Reduced patient survivability Signup and view all the answers

Which of the following is NOT a benefit of properly applied PPV?

Increasing firefighter heat stress Signup and view all the answers

What is the overall impact of coordinated, purposeful PPV on the fire ground?

Safer fire ground Signup and view all the answers

Why should all FD suppression personnel follow safety precautions during PPV with positive pressure fans?

To ensure safety during ventilation procedures Signup and view all the answers

What are the consequences of performing PPV in an uncoordinated manner?

Dangerous situations on the fire ground Signup and view all the answers

What must be provided before applying positive pressure ventilation into the structure?

An exit for the pressurized air in the fire area Signup and view all the answers

In offensive fire operations, when should positive pressure ventilation be applied?

Early in the operation Signup and view all the answers

Where should positive pressure fans be placed for effective ventilation?

At the point of entry Signup and view all the answers

What is the objective of placing positive pressure fans near the entry doorway?

To create a pressure 'cone' effect around the door Signup and view all the answers

When should the vent opening be completed before crews enter the structure?

Prior to applying positive pressure into the structure Signup and view all the answers

Which side of the fire should positive pressure ventilation be applied from?

Unburned side of the fire Signup and view all the answers

What is a critical consideration for effective positive pressure ventilation?

'Exit' for pressurized air in the fire area Signup and view all the answers

Why should crews entering a structure dismount their apparatus with fans?

To take fans to the point of entry for PPV application Signup and view all the answers

What is the minimum time required to determine the effectiveness of ventilation with a PPV fan?

15 seconds Signup and view all the answers

Why might windows and doors that are already open need to be closed during PPV operations?

To direct air flow into the fire area Signup and view all the answers

What is the purpose of maintaining fire attack corridor integrity for all crews with interior assignments?

To ensure safe and efficient fire attack operations Signup and view all the answers

Why might supplemental PPV operations be required in high-rise buildings despite having smoke management systems?

Because smoke management systems contain smoke but do not remove it Signup and view all the answers

Which area is considered a good first choice for the exhaust exit during PPV operations in the fire area?

A stairwell on the opposite side of the fire area Signup and view all the answers

In multi-story/high-rise fires, what is expected to be performed by the Ventilation Group?

Perform smoke removal operations Signup and view all the answers

How does a smoke management system differ from the purpose of PPV operations in high-rise buildings?

Smoke management systems evacuate smoke whereas PPV systems only contain it Signup and view all the answers

What is a key strategy mentioned for systematically clearing areas of a structure of smoke during ventilation operations?

Sealing off cleared areas Signup and view all the answers

What is recommended regarding the number of fans needed for a multi-story building?

At least two fans at the base of the building and additional fans on different levels in the stairwell Signup and view all the answers

What is emphasized when dealing with large buildings and smoke removal?

Large buildings may need multiple fans at various locations for effective smoke removal Signup and view all the answers

What is the primary purpose of establishing a Ventilation Group in multi-story and high-rise buildings?

To coordinate all aspects of Positive Pressure Ventilation (PPV) Signup and view all the answers

When can Positive Pressure Ventilation (PPV) be used effectively for exposure control?

In situations with common attics or breached separating walls Signup and view all the answers

What area specifically requires a fan at the entry to the fire door?

Stairwells Signup and view all the answers

In what kind of buildings may multiple fans be necessary at more than one location?

Large buildings with large square footage Signup and view all the answers

What is a key consideration when coordinating Positive Pressure Ventilation (PPV) in large buildings?

Close coordination with all company officers Signup and view all the answers

What type of structures require larger amounts of air for proper pressurization and smoke movement?

Larger structures like big shopping malls or apartments complexes Signup and view all the answers

Study Notes

PPV Operation Guidelines

Vent opening should not be created on the windward side of the structure.
If the initial fire attack crew is unable to access the fire and apply water within 2 minutes, the fan should be shut down or turned away from the entry port.
PPV operation should not be continuous if the location of the fire is not known and water is not being applied to the fire.

Initiating PPV Operations for Fire Attack

The IC will announce an offensive fire with PPV, followed by pulling a hoseline, placing it at the point of entry, and charging the line.
A proper exit port will be located, opened up, and announced on the radio.

PPV Placement and Tactical Considerations

Positive pressure fans should be placed at the point of entry, 6-10 feet from the doorway, and positioned to create a pressure "cone" effect around the door.
The objective is to create an exit for the pressurized air, which must be provided prior to applying positive pressure into the structure.

Controlling Air Flow

Air flow from PPV must be controlled throughout the operation, and windows and doors may need to be closed or opened to direct the air flow into the fire area.

Multi-Story/High Rise PPV Operations

Multi-story or high-rise fires require greater coordination and additional fans, and may require supplemental PPV operations.
Stairwells may be used to direct air flow from PPV, and multiple fans may be needed at the base of the building and on various levels in the stairwell.

Positive Pressure for Exposure Control

PPV can be used for exposure control, especially in common attics or where separating walls may have been breached.

Large Buildings and PPV Operations

Large buildings may require multiple fans at more than one location to effectively remove smoke, and a Ventilation Group may be established to coordinate all ventilation operations.

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Description

Learn about the application of Positive Pressure Ventilation (PPV) during structural fire operations according to the SOP of Southern Nevada Fire Operations. Understand the benefits and proper use of PPV in removing heat and smoke from buildings.

PPV