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10 Cards in this Set
- Front
- Back
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Define ventilation |
The removal of heated air, smoke or other airborne contaminants from a structure, and their replacement with a supply of fresher air |
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Name the 3 types of ventilation |
Self ventilation Automatic ventilation Tactical ventilation |
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When can ventilation be done |
After LFB arrival and before control of the fire is gained After control of the fire is gained After extinction of the fire |
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Name the 2 types of TACTICAL ventilation |
Defensive Offensive |
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What is defensive ventilation |
Defensive ventilation is carried out on adjoining and outer compartments after the fire compartment has been isolated and supressed |
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What is offensive ventilation |
Offensive ventilation is carried out to directly affect the fire itself, to limit the fire spread and improve conditions within the fire compartment |
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Name the two techniques of TACTICAL ventilation |
Vertical Horizontal |
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When can you use vertical ventilation |
When the fire has spread or is in the roof space Where there are tall vertical shafts within the building |
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What are the 5 principles of ventilation |
1) Hot gases should be released at the greatest height possible and fresh air enter at a low level 2) High level vent should be down wind of the low level vent 3) High level vent should be made before the low level vent 4) If conditions indicate a back draft the compartment should be ventilated from outside the building when possible 5) Outlet vents should be protected by FF in BA with branches. Hot gas emitting from the vent should be cooled to prevent ignition |
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Name the 6 benefits of TACTICAL ventilation |
1) Assist the escape of occupants and firefighters by restricting the spread of smoke 2) Improve conditions for firefighters and trapped occupants 3) Speed up rescue operations and fire attack by reducing heat and smoke 4) Reduce risk of flashover, backdraft and fire gas explosion 5) Reduce fire spread and property damage by controlling the movement of hot smoke and gases 6) Improve visibility |
