Card Set Information
What is ventilation?
The process of removing smoke, heat, and toxic gases from a burning building and replacing them with cooler, cleaner, more oxygen-rich air.
What are the benefits of proper ventilation?
Locate trapped occupants faster
Fresh air to occupants
Advance hose lines rapidly and safely
Reduce backdraft and flashover
Limit fire spread
Reduce property damage
When performing ventilation, which side of the building is opened first/last?
Leeward side is always opened first, followed by the windward side.
What are 3 reasons to perform ventilation?
Life safety, containment, and property conservation
Where should you ventilate?
As close to the fire as possible
What are the 2 basic types of ventilation?
Horizontal and vertical
What are the 2 different methods to perform ventilation?
Natural and mechanical
What are the 3 types of mechanical ventilation?
Negative-pressure, positive-pressure, and hydraulic
What are the advantages of negative-pressure ventilation?
Explosion proof motors
What are the limitations of negative-pressure ventilation?
Air flow control
What are the advantages of positive-pressure ventilation?
Quick and efficient
What are the limitations of positive-pressure ventilation?
May spread the fire
May increase carbon monoxide levels
What 2 things should be kept in mind when performing positive-pressure ventilation?
Exit vent hole should be smaller than PPV fan hole
PPV fan should cover the entire opening
Describe hydraulic ventilation
Fog stream set to cover 90% of the window
Nozzle should be roughly 2 feet back from window
Advantage is that you can move several thousand cubic feet of air per second
Disadvantages are water damage and possible safety hazards
What are 3 types of roof ventilation cuts?
Rectangular, peak, and trench
Describe a rectangular roof cut
Four cuts completely through the decking
Use care not to cut structural supports
Stand upwind and have a safe exit
If several layers exist, you may have to peel a layer at a time
Describe a peak roof cut
Used for peak roofs with plywood sheeting
A tool is used to reveal the roof covering along the peak
A power saw or axe is used to make a series of vertical cuts
Describe a trench cut
Used to stop the progress of a large fire in a narrow building
Creates large opening ahead of the fire
"Writes off" a part of the building
Describe Measures M and when it would be used.
Measures M is a combination of vertical and horizontal ventilation generally used in a high rise building.
1) Grade level exterior door is opened.
2) Grade level stairwell door is opened.
3) Fire floor stairwell door is opened.
4) Fire unit door is opened.
5) Fire unit doors/windows are opened.
Positive pressure fan is placed in front of the exterior door and forces out all the smoke and toxic gases created in a fire.