What are the main types of horizontal ventilation?

Horizontal ventilation can be accomplished with hydraulic, natural currents, positive pressure or negative pressure methods. Which ever method you use, you must know where the fire is and coordinate your operations.

What is the difference between horizontal ventilation and vertical ventilation?

Vertical ventilation takes place through holes cut in the roof, typically by truck companies during the early stages of a fire in a process known collectively as roof operations, while horizontal ventilation usually takes place through doors and windows.

How do you vent a house fire?

Ventilation should begin as close to the room of origin as possible. Open or remove those windows in the room of origin that are closest to the fire. Prioritize the removal/opening of windows to those where flames or pressurized smoke is already coming out of or where fire is visible or audible.

What is a PPV fan?

The positive pressure (PPV) fan is the most commonly found fire service fan. It works by forcing air into a structure, creating a “higher pressure” inside the structure which forces the interior air to the “lower pressure” outside the structure through an exit portal.

What must be done before beginning ventilation?

What must be done before beginning ventilation? The hose team must be in place and ready to attack the fire. Which statement about hydraulic ventilation is correct? The ventilation crew must remain in the path of the exhausting smoke.

Why do firefighters cut holes in the roof?

Heat and smoke rise into the attic where the fire can move quickly. Firefighters may go ahead of the fire on a roof and cut holes to access the attic to stop the fire from spreading through the attic.

Why do firemen cut holes in the roof?

What is a negative pressure fan?

What is negative air pressure? Each fan in your computer can move a certain amount of air each minute. Negative air pressure is where you have more air being pushed out of your case than sucking it in. By configuring your fans in this manner, you end up with lower air pressure inside your case than outside of it.

What is horizontal ventilation?

Horizontal ventilation occurs opposite of the attack crew. If the room is near a corner of the building it is best to roll around the corner and take a window. This can keep the compartment from becoming too heavily influenced by wind and pushing it over the attack crew. The key is opening up the windows to support the exhaust.

How do I increase the ventilation in a room?

As the crew advances in and begins to apply water you can increase the horizontal ventilation in that room if more windows are available. Horizontal ventilation occurs opposite of the attack crew. If the room is near a corner of the building it is best to roll around the corner and take a window.

How to ventilate a building with exhaust?

An exhaust can be a widow or a hole cut into the roof, but we will focus on horizontal as it is often accomplished before vertical ventilation. Unless wind will create a hazardous condition we will vent horizontally opposite of the attack crew. Using the diagram below it is best to split the building diagonally from the corners.

What should a building’s ventilation look like?

The building should present some indicators about the ventilation that is already occurring. There will be exhausts and intakes. It starts with observing, supporting and possibly changing what is already happening.