SOG Section 17 - Vent Flashcards Preview

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Flashcards in SOG Section 17 - Vent Deck (35)
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1

What should be considered in a ventilation profile?

Existing/potential flow-paths

Location and stage of fire

Fuel/vent limited

Wind direction

Smoke conditions: Volume, velocity, density, colour

Exposures

Rescue or Suppression

Building layout and construction

Integrated vent systems

2

Why should an open door be closed upon arrival at an incident?

Control heat-release rate and until a tactical advantage is deemed

3

What are the three ventilation mechanics?

Natural, Mechanical, hydraulic

4

What should be communicated to the venting crews during ventilation?

Changes to vent profile or conditions

5

What should be considered when deciding type of ventilation?

Location of interior crews

Tactics that complement IAP

Occupant whereabouts

How it will affect tactics, fire behaviour and operational time frames

6

What is a sector officer responsible for when using PPV to clear a house?

Coordinating opening and closing of areas for smoke exhausting

7

During which operation should PPV be considered shut down?

Overhaul/checking for extension

8

What should be considered prior to PPA?

360 completed

Flowpath determined

Confirm VEIS is complete and personnel and occupants are protected

Fire location is determined

Fire does not involve the structure

Minimum 2 crews onscene

Exhaust locations have been determined

9

Where should fans be placed for PPA?

Unburned side of building, 2m back from opening

10

How long should PPA be used?

Brief durations, not long term operations

11

Where should other personnel be when PPA begins?

Outside of building

12

What three things are to be considered DURING PPA?

Improving - Keep using

No change - reevaluate and reposition if necessary

Worsening - discontinue immediately

13

What else is required for PPA application?

Charged hoseline

14

Which direction is ideal flowpath for PPA?

Upwind, rather than downwind

15

What is the preferred tactical consideration along with PPA?

Transitional attack

16

What timeframe should be given during PPA, prior to crews entering?

30-60 seconds

17

Where shall the exhaust for PPA be located?

In the fire area

18

What size ratio should the exhaust be for PPA?

At least 1:1 to the entry, ideally 2:1

19

What will provide information on the effectiveness of PPA?

Exhaust outlet and backflow.

20

When using fans for exposure protection, where should they be located?

Ahead of moving fire to force it back into fire area

21

What is needed in most cases when using PPV to protect exposures?

An Exit point in the fire area

22

When are fans most effective for exposure protection?

Common Attic spaces

23

What is the "Blow-torch" effect?

Normal and predictable occurrence at positive pressure exhaust point

24

What should not be done during PPA to the exhaust point?

Hosestream into exhaust point

25

What type of structures is PPA NOT ideal for?

Larger, open, high ceiling structures

26

What is the distance between fans for set-up during high-rise ventilation?

1.5-2 metres between

27

What is the stack effect?

Air movement in and out of buildings, chimneys, etc, due to air buoyancy

28

What affects air buoyancy?

Air density differences due to moisture and temperature

29

What can the stack effect control, both negatively and positively?

natural ventilation, air infiltration and fire

30

Which apparatus is in charge, unless otherwise assigned, of setting up high-rise ventilation?

Third arriving

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