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LT 2024 > Ventilation > Flashcards

Ventilation Flashcards

1
Q

What are the 3 types of ventilation?

A
  1. Horizontal
  2. Vertical
  3. Positive pressure
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2
Q

Synthetic products after 1970 now cause IGNITION to FLASHOVER how much faster?

A

30 times!

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3
Q

What is the primary responsibility of the 1st due truck on a box?

A

Life safety

(Entry, search rescue, horizontal ventilation)

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4
Q

What are the 4 position names of a truck crew?

A

Irons
Hook
AO app operator
OV outside vent

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5
Q

What are the 3 operational modes of a truck crew?

A

All in for search
All out for ventilation
Splitting

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5
Q

Where should ventilation openings never be created?

A

Behind an advancing hose line

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6
Q

What is proper timing considered regarding COORDINATED ventilation?

A

Interior crews breathing SCBA and have a charged hose line in position, making a push or actually hitting the fire

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7
Q

Where is proper placement of a heat hole for vertical ventilation?

A

As close to directly over the fire as safely possible

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8
Q

Where is proper placement of a horizontal ventilation opening?

A

On the OPPOSITE side of the fire room from the advancing hose line

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9
Q

What should you not do if the location of the fire is unknown?

A

DO NOT break windows!!

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10
Q

What are the responsibilities of the second due truck?

A

Assist first due truck with unfinished responsibilities
Ladder upper floors for egress

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11
Q

What are the 3 critical radio communications made by 1st due engine specific to horizontal ventilation?

A

Fire attack is making entry
Location of fire
Take the glass

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12
Q

What is the appropriate tactic if it is believed that Backdraft conditions exist?

A

Vertical ventilation

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13
Q

What are the 3 kinds of roof holes?

A

Inspection hole
Smoke indicator hole
Heat hole

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14
Q

What size heat hole should you cut?

A

4x4 on residential
4x8 on commercial

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15
Q

Is a heat hole offensive or defensive?

A

Offensive

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16
Q

Is a trench cut offensive or defensive?

A

Defensive

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17
Q

What should the spacing be for indicator holes?

A

Every few yards

18
Q

What is the initial width of a trench cut?

A

24-48”

19
Q

When assigned to the roof what direction should you approach if possible?

A

Windward side

20
Q

When a structure has a flat roof, where should you place the ladders?

A

On the corners

21
Q

What must a roof crew establish as soon as possible?

A

A second means of egress

22
Q

Does Portland fire use PPA attack?

A

No

23
Q

When will Portland fire use ppv?

A

Only used for smoke removal after a fire has been knocked down

24
Q

PPV is most effective with what size exhaust opening?

A

3/4 to 1-3/4 size of entrance

25
Q

Does the heat of a fire increase or decrease interior room pressure?

A

Increase

26
Q

Because today’s fires develop more rapidly, firefighters often arrive on scene when?

A

Just PRIOR to or DURING flashover!

27
Q

Ventilation is defined as the systemic and coordinated removal of what for structure involved in fire?

A

the PRODUCTS OF COMBUSTION

28
Q

What does “Take Glass” mean?

A

Used to let team know its an appropriate coordinated time to break a window

29
Q

What is the Heat Release Rate?

A

The RATE at which HEAT (energy) is RELEASED by the burning of FUEL and OXYGEN

Also a MEASURE of the SIZE of the fire compared to the THERMAL HAZARD or EFFECTS of the fire

30
Q

Increase in the HRR will increase what 2 things?

A

HEAT and SMOKE production

31
Q

What is the difference between Venting for LIFE and Venting for EXTINGUISHMENT?

A

LIFE attempt to reach a known/suspected life hazard

EXTINGUISHMENT

32
Q

What are the 2 keys to any type of successful ventilation opening?

A
  1. Proper placement
  2. Proper timing
33
Q

What are 3 indicators and ways that confirm proper ventilation timing?

A
  1. Visual confirmation
  2. Radio communication with interior crews
  3. Other (Audible hose sounds, smoke turning to steam)
34
Q

What is the difference between NATURAL and FORCED ventilation?

A

NATURAL (wind)

FORCED (Negative, Positive, Hydraulic)

35
Q

What are some things to look at on the roof to tell you a good place for heat hole placement?

A

Building construction
Smoke conditions
Pressurized smoke between shingles
Bubbling tar
Sagging area

36
Q

A heat/vent hole is generally placed how high on the roof?

A

At the highest point possible

37
Q

Describe an OFFENSIVE and DEFENSIVE ventilation cut?

A

OFFENSIVE heat hole

DEFENSIVE trench cut

38
Q

Should you cut a heat hole before a trench cut?

A

Yes if the fire has not yet naturally vented

39
Q

Can you start pulling panels before the trench cut is finished?

A

NO. It will bring the fire too fast

40
Q

When doing a trench cut, where should the indicator holes be placed?

A

Every few YARDS between heat hole and trench cut

41
Q

Flat or arched roofs will usually require at least how many truckies?

A

Full 4 person crew

42
Q

On PEAKED roofs, where is desired ladder placement?

A

In close proximity to desired hole location

43
Q

Lightweight roofs can fail within how many minutes of fire impingement?

A

5

LT 2024 (53 decks)

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