17- 01 Ventilation

Question 1

What is considered a mainstay of fire control?

Answer 1

controlling the air

Question 2

What is the limiting factor in the involved fuel’s heat release rate?

Answer 2

available air

Question 3

How can fire control be gained and maintained? (2)

Answer 3

1. limiting ventilation

2. controlling flowpaths

Question 4

What may change fire behaviour drastically in regards to ventilation? (3)

Answer 4

1. exiting occupants
2. changes in structural integrity
3. FF ops

Question 5

What is flowpath?

Answer 5

movement of heat/ smoke from higher pressure- lower pressure

Question 6

What is fuel limited?

Answer 6

the heat- release rate (amount of energy released over time) is limited primarily by chemical/ physical characteristics of available fuels

Question 7

What are key indicators of fuel limited fires? (4)

Answer 7

1. incipient/ early growth fire
2. high neutral plane (smoke layer)
3. better visibility
4. relatively low temperatures

Question 8

What is hydraulic ventilation?

Answer 8

using water flow to draw air out of structure

Question 9

What are examples of mechanical ventilation? (2)

Answer 9

1. PPV

2. building systems

Question 10

What are different types of ventilation? (3)

Answer 10

1. hydraulic
2. mechanical
3. natural

Question 11

What are examples of natural ventilation? (3)

Answer 11

1. wind
2. opening windows
3. creating openings at highest point of structure

Question 12

What is tactical ventilation? (6)

Answer 12

planned, systematic, coordinated removal of heat, smoke, fire gases and replacement with cooler fresh air

Question 13

What is vent limited?

Answer 13

a fire in which heat release rate and fire growth are regulated by available O2 w/i space

Question 14

What are indicators of vent limited fire? (7)

Answer 14

1. fire is beyond incipient stage
2. mid-low neautral plane
3. poor visibility
4. flames exiting windows/ doors
5. air being drawn into fire when door opened
6. increased temps
7. all common backdraft indicators

Question 15

What is ventilation profile?

Answer 15

ventilation points showing flow paths of heat and smoke out of structure as well as any air movement into structure

Question 16

What should be considered when determining a structures ventilation profile? (9)

Answer 16

1. existing/ potential flow-paths
2. location and stage of fire
3. fuel or vent limited
4. wind direction
5. smoke conditions (volume, velocity, density and colour)
6. exposures
7. rescue or suppression
8. building layout/ construction
9. integrated ventilation systems

Question 17

What considerations should be made in regards to doors and ventilation? (3)

Answer 17

1. front door consdered as part of overall ventilation strategy
2. closing door to structure will help control heat- release rate of fire
3. consider door control tactics during hose advancement

Question 18

What are considerations for choosing tactical plan for ventilation? (4)

Answer 18

1. tactics complement incident action plan
2. location of interior operations personnel
3. occupant location
4. how tactics may affect flow-path, fire behaviour, operational time frames

Question 19

What SOGs can be considered extensions of this SOG? (3)

Answer 19

1. SOG 17-02 PPV
2. SOG 17-03 PPA
3. SOG 17-04 High Rise Ventilation