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Captain's exam > SOG Section 17 - Vent > Flashcards

SOG Section 17 - Vent Flashcards

1
Q

What should be considered in a ventilation profile?

A

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

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2
Q

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

A

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

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3
Q

What are the three ventilation mechanics?

A

Natural, Mechanical, hydraulic

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4
Q

What should be communicated to the venting crews during ventilation?

A

Changes to vent profile or conditions

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5
Q

What should be considered when deciding type of ventilation?

A

Location of interior crews

Tactics that complement IAP

Occupant whereabouts

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

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6
Q

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

A

Coordinating opening and closing of areas for smoke exhausting

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7
Q

During which operation should PPV be considered shut down?

A

Overhaul/checking for extension

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8
Q

What should be considered prior to PPA?

A

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

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9
Q

Where should fans be placed for PPA?

A

Unburned side of building, 2m back from opening

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10
Q

How long should PPA be used?

A

Brief durations, not long term operations

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11
Q

Where should other personnel be when PPA begins?

A

Outside of building

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12
Q

What three things are to be considered DURING PPA?

A

Improving - Keep using

No change - reevaluate and reposition if necessary

Worsening - discontinue immediately

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13
Q

What else is required for PPA application?

A

Charged hoseline

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14
Q

Which direction is ideal flowpath for PPA?

A

Upwind, rather than downwind

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15
Q

What is the preferred tactical consideration along with PPA?

A

Transitional attack

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16
Q

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

A

30-60 seconds

17
Q

Where shall the exhaust for PPA be located?

A

In the fire area

18
Q

What size ratio should the exhaust be for PPA?

A

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

19
Q

What will provide information on the effectiveness of PPA?

A

Exhaust outlet and backflow.

20
Q

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

A

Ahead of moving fire to force it back into fire area

21
Q

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

A

An Exit point in the fire area

22
Q

When are fans most effective for exposure protection?

A

Common Attic spaces

23
Q

What is the “Blow-torch” effect?

A

Normal and predictable occurrence at positive pressure exhaust point

24
Q

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

A

Hosestream into exhaust point

25
Q

What type of structures is PPA NOT ideal for?

A

Larger, open, high ceiling structures

26
Q

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

A

1.5-2 metres between

27
Q

What is the stack effect?

A

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

28
Q

What affects air buoyancy?

A

Air density differences due to moisture and temperature

29
Q

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

A

natural ventilation, air infiltration and fire

30
Q

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

A

Third arriving

31
Q

Where should venting ops be set-up for high-rises?

A

Exterior exit of Operations Stairwell

32
Q

Who designates the Operations Stairwell, if not already determined?

A

Vent Sector Officer

33
Q

What are the vent crew’s duties after initial set-up of ventilation at a high-rise?

A

2 crew members head up Operations Stairwell, other 2 members head to Evacuation Stairwell and set-up identical ventilation (2 fans in series)

34
Q

What are the different options for smoke removal in high-rises?

A

Area of origin (door or window)

Straight across or Nearby Area of origin

Roof access

Smoke Shafts

35
Q

What additional considerations should be made for determining best vent option in high-rises?

A

Natural wind

Stack-effect

Captain's exam (58 decks)

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