*Bk 29- Ventilation Flashcards Preview

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Flashcards in *Bk 29- Ventilation Deck (52):
0

Effective ventilation will accomplish four main objectives, what are they?

1. Save lives.
2. Assist in firefighter access.
3. Control the horizontal spread of fire.
4. Reduce the possibility of flashover and backdraft

1

If the heat, smoke, and fire gases are not released, they will accumulate at the highest point of the structure and begin to bank down and spread laterally. This process is generally known as?

Mushrooming

2

________ is a condition where all of the contents of a room are heated to their ignition temperature. Once their ignition temperature is reached, the entire room will quickly be involved in flames.

Flashover

3

In a confined area, if the structure’s contents reach their ignition temperature and there is not sufficient oxygen to support combustion. Once oxygen is introduced, _________ can occur.

Backdraft

4

The best way to prevent backdraft is to perform ____________

Vertical ventilation

5

What are the two types of horizontal ventilation that can be performed?

Natural and positive pressure

6

With conventional construction, if time and safety permits, the roof team “WILL” cut the heat hole where?

Directly over the fire

7

When operating on a lightweight truss roof (or suspected
lightweight truss), the ventilation team _______________ conduct ventilation operations directly over the fire

Shall not

8

The two types of ventilation holes are:

1.Heat hole (offensive)

1.Strip ventilation (defensive)

9

What type of hole is placed directly over the fire or as close to the fire as safety will allow?

Heat hole

10

What type of hole should be placed well ahead of the fire, and should extend the entire width of the building, creating a firebreak?

Strip ventilation hole

11

Before cutting a strip hole, what must be accomplished first?

Heat hole

12

What type of cut is a technique used when cutting plywood sheathing (4 cuts)?

Center rafter cut

13

_________ is the material used to comprise the base and exterior covering for a roof.

The base is the material attached to the roof rafters

Decking

14

When sheets of plywood are then staggered much like a brick or block wall, this is known as?

Diaphragm nailing

15

Plywood sheathing is installed so that the ________ ft dimension of the plywood crosses the rafters or joists and the _______ ft dimension parallels the rafters or joists

1. 8

2. 4

16

What technique is used to cut 1” x 4” or 1” x 6” solid, spaced, or diagonally sheathed roofs?

The cuts are made _______ to rafters with no concern to locating rafters.

1. Dice cut

2. Parallel

17

What type of metal clips are used to hold the butted ends of plywood together?

They are common on ______ roofs.

1. H clips

2. Pitched

18

What type of cut is made through the roof decking that is perpendicular to rafters and used to locate rafters?

Head cut

19

A head cut must be done on roofs covered with _______ and _______ sheathing

1. Plywood

2. Diagonal

20

The removal of sheathing is enhanced by a _______ motion with an appropriate tool.

It is more effective when used near the rafters.

J hook

21

_______ is a single cut made through the roof decking, the same width as the chain saw blade.

It can be used as an alternative to using the smoke indicator hole

Kerf cut

22

For roof ventilation, what is the “MINIMUM” amount of ladders that should be thrown to the involved structure?

2

23

When louvering plywood, push down on the _______ side (the side ______ to your ladder) and pull on the far side.

1. Near

2. Closest

24

A nailing block will usually be found every _____ feet.

4

25

A 2” x 4” laid flat between rafters to provide a nailing surface for the edge of the plywood sheathing is known as?

Nailing block

26

A ______ cut is a small triangular piece of roof covering (composition), which is removed from the roof to determine what?

1. Plug cut

2. Sheathing type and composition thickness

27

The normal and most common size for plywood is?

4' x 8'

28

A _______ cut is a light cut of the roof covering, usually composition only.

It is used to facilitate the removal of multiple layers of ________ on the roof.

1. Score cut

2. Roofing material (Composition)

29

A _______ cut is a light cut made with the chain saw, cutting through the roof covering and plywood sheathing only.

It is used on a panelized roof when you are performing the cutting technique known as ___________?

1. Skim cut

2. Louver off a purlin

30

A ________ is a small triangular hole cut through the roof decking(sheathing and roofing material) that is used to indicate smoke and fire conditions directly below.

Smoke indicator hole

31

How far apart should smoke indicator holes be placed along the path of access or egress?

Every few yards

32

A turbine-style ventilator is about ______% more effective when the turbine is spinning

30%

33

Ventilators can be placed on roofs to ventilate what two things?

Attic and building interior

34

1. If vent pipes appear to be growing out of the roof, this should be an indication that the roof has what?

2. This condition is known as _____________.

1. Sagged or dropped

2. Growing vent pipes

35

A ________ cut is a series of two cuts used to identify rafter direction “ONLY.”

45-degree cut

36

A __________ cut will tell you rafter type and rafter direction, the sheathing type, the thickness of roof composition and when complete, it can act as a smoke indicator hole

45-degree inspection cut

37

What 5 things will a 45-degree inspection cut will tell you when complete?

1. Rafter type
2. Rafter direction
3. Sheathing type
4. Thickness of roofing material (composition)
5. Smoke indicator hole

38

When rolling a rafter during the 45-degree inspection cut, you should continue the cut approximately ___ to ___ inches past the rafter.

6 to 10 inches

39

When dicing, the puller can start pulling boards after a minimum of how many cuts (dices)?

3

40

What determines the length of a dice cut?

The tool being used to pull the sheathing

41

When dicing, how many un-pulled sections should be kept between the chain saw operator and the puller?

1

42

During a center rafter louver, the head cut is started by first cutting: (a) towards (b) away from - your ladder to locate your first“outside” rafter.

Away from

43

During a center rafter louver, the parallel cut should be approximately how many inches inside the rafter?

2-3 inches

44

During a center rafter louver, how long should the parallel cut be?

Approximately 3-1/2 feet

45

What are the 5 cutting techniques to ventilate a penalized roof?

1. DROP METHOD (OFFENSIVE)
2. PULL BACK METHOD (OFFENSIVE)
3. OFFENSIVE LOUVER (OFFENSIVE)
4. LOUVER OFF A LAM BEAM / MAIN BEAM (DEFENSIVE)LOUVER 5. OFF A PURLIN (DEFENSIVE)

46

During penalized roof ops, how far away from the purlins should you cut to avoid hitting metal hangers?

4-6 inches

47

Because of work area limitations while louvering off a lam-beam, the cutter and puller should __________ before louvering the section.

Exchange tools

48

You are performing louver off a lam-beam. Before louvering a complete section, what should be accomplished?

Start an outside cut (top cut) on the next section

49

You are performing a louver off a purlin. Your top cut should be a ______ cut.

How far should you reach out to perform this cut?

1. Skim cut

2. 3-1/2 feet

50

Ventilation:

The key to safe and effective roof ventilation is the knowledge of what two things?

rafter type and rafter direction

51

Which panelized roof ventilation operations are considered offensive?

Which are considered defensive?

Offensive: Pullback, Drop, Offensive louver

Defensive: louver off main beam, louver off purlin

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