Ventilation Techniques (ch.1) Flashcards

1
Q

Ventilation is the ______

A

Systematic removal of heat, smoke, and fire gases from a structure, replacing it with cooler clean fresh air.

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2
Q

Effective ventilation will accomplish four main objectives

A
  1. save lives
  2. Assist with firefighter access
  3. control the horizontal spread of fire
  4. reduce the possibility of flashover and backdraft
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3
Q

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 ______

A

Mushrooming

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4
Q

Condition where all of the contents of a room are heated to their ignition temperature.

A

Flashover

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5
Q

Each year in the United States, there is an average of ____ deaths to firefighters in fire service. _____ of those deaths are due to flashover

A

100 deaths in fire service

85 deaths to flashover

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6
Q

With horizontal ventilation there are two methods usually performed

A

Natural and positive pressure ventilation

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7
Q

The key to safe and effective roof ventilation is the knowledge of ____ and ___

A

Rafter type and direction

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8
Q

There are basically only two types of ventilation holes:

A
  1. Heat Hole (Offensive)

2 Strip. Ventilation (defensive)

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9
Q

Strip ventilation must be done in conjunction with a ____

A

Heat hole

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10
Q

Center rafter cut is a technique when cutting ___ sheathing (4cuts)

A

Plywood

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11
Q

Decking is the material used to comprise the ____ and exterior covering.

A

Base

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12
Q

Diaphragm nailing; plywood sheathing is installed so that ____ ‘ dimension crosses the rafters and the ____ ‘ dimension

A

8’ crosses
4’ parallel
For diaphragm nailing

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13
Q

Dicing is a technique used to cut _____” or ____in solid, spaced or diagonally sheathed roofs.

A

1x4 or 1x6 sheathing

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14
Q

Metal clips used to hold the butted ends of plywood together

A

H clips

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15
Q

A head cut is a cut made through the roof decking that is made perpendicular to rafters. A head cut is used to _____

A

Locate rafters

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16
Q

The removal of sheathing is enhanced by a _____ motion

A

J hook

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17
Q

Ground ladders should be thrown to _____ of the structure

A

Uninvolved corners

18
Q

The roof ventilation, a minimum of ______ ladders should be thrown to the involved structure

A

2

19
Q

Nailing blocks are usually made from ____ “, laid flat between rafters. A nailing block will usually be found every ___ ft

A

2x4” block

Every 4ft.

20
Q

a small triangular piece of roof covering (composition), which is removed from the roof to expose the roof sheathing.

A

Plug cut

21
Q

A plug cut is used to determine ______ and ______

A

Sheathing type and roof comp thickness

*can identify rafter direction due to nailing pattern/direction of sheathing

22
Q

A light cut of the roof covering, usually composition only

A

Score cut

23
Q

The ___ is used on a panelized roof when you are performing the cutting technique known as louver off a purlin

A

Skim cut

24
Q

Skylights are usually constructed from ___ or ___

A

Glass or plastic

25
Q

On apt buildings skylights will be placed over ____ and ____. On commercial buildings, they will be placed over _____

A

Hallways, stairwells

Manufacturing areas

26
Q

Smoke indicator holes should be placed along the path of access or eagerness every____

A

Every few yards

27
Q

Strip ventilation is a long, narrow section of roofing material that has been removed well ahead of fire. The strip acts as a ______

A

Fire break

28
Q

If ventilators are working correctly, leave them alone. A turbine-style ventilator is about ____% more effective when the turbine is spinning

A

30%

29
Q

Vent pipes are plumbing pipes that extend from inside the structure through the roofline. Vent pipes can be constructed from ____

A

ABS plastic, cast iron, or steel pipe.

30
Q

A 45 degree cut is a series of ___ cuts.

Used to identify _____ only

A

2 cuts

Rafter direction

31
Q

A 45 degree inspection cut will tell you x5

A
  1. Rafter type
  2. Rafter direction
  3. Sheathing type
  4. thickness of comp
  5. Smoke indicator
32
Q

45 degree inspection cut; when the saw makes contact with rafter, roll over the rafter and continue the cut approximately ____ to ___ in

A

6 to 10in

33
Q

The length of the dice cut is determined by____

A

The reach of tool being used to pull sheathing

34
Q

The chain saw operator should cut a minimum of ___ dices before puller begins removing sheathing

A

3

35
Q

Always have a minimum of _____ unpulled section between cutter and the puller

A

One

36
Q

Center rafter louver. When over ventilation are, make head cut to locate a minimum of ____ rafters

A

3

37
Q

Center rafter louver; after head cut , cut a parallel cut approximately ___ to ___ in inside rafter. Make parallel cut approximately ___ ft long

A

2 to 3 in

3 1/2 ft long

38
Q

Panelized roof dimensions;

Plywood
Beams
Purlin
Joists

A
Plywood = 4x8 1/2”
Beams = 6x36 / 12 to 40ft spacing
Purlin = 4x12/ 8ft spacing
Joists = 2x4 / 24in spacing
39
Q

Cut ___ to ___ inches inside of purlins to avoid hitting metal hangers

A

4 to 6in

40
Q

While standing on purlin, start “skim cut”. Reach out as far as you comfortably can, approximately ____ ft

A

3 1/2 ft