Ch. 9 Ventilation Flashcards Preview

HOT > Ch. 9 Ventilation > Flashcards

Flashcards in Ch. 9 Ventilation Deck (67)
Loading flashcards...
1

Two main reasons for performing ventilation

Venting for fire
Venting for life

2

4 problems with thinking ventilation isn't as important because of SCBA's

Ignores victims inside
Assumes FF's mask will always protect
Buildup of heat
Buildings are made tighter (backdraft)

3

Distinguishing between Vent for Life and Vent for Fire, KEY FACTOR IS:

Timing of ventilation
Life = as soon as possible
Fire = delayed until resources in place to attack

4

Most important concept when discussing ventilation:

Must be of sufficient volume to WIN!

5

Break window vs opening

Can stand up, open
Window stuck and not lot of heat/smoke, find another means
Driven back by heat, break WHEN HOSELINE IS CHARGED

6

Difficulties with double glazed Windows

Can't blow out with hoseline
Inability to clear horizontal sash (more dangerous)

7

After placement of attack and interior search, this is most crucial: (Chapter 9, Vent)

Outside Vent team

8

Horizontal vent faster and easier to perform than vertical?

Takes advantage of existing openings

9

Venting using fog: several factors determine how much air and smoke moved (3)

Volume
Velocity = pattern + pressure. 30 degree range of fog
Geometry of opening (6-8 ft back)

10

Fans not covering opening correctly (exhaust devices - sucking smoke)

Churning - pulls air from outside, to inside and back out - LIMITS EFFICIENCY

11

2 most common vertical arteries/avenues

Staircase
Pipe chase

12

2 types of old-style roofs

Standard flat roof: roof joist at roof level, roof boards nailed to joists
Inverted roof: roof boards nailed to framework of 2x4's several feet above main roof joists

13

Style of roof that has been dominant in the flat roof industry in the last 20 years, at least in the East and Midwest:

Metal deck roof

14

Dimensions for flat roofs (standard flat roof)

2 x 10's or 3 x 12's beams
16 in apart (carry same load as floors)
Limited to 20 ft span between supports, masonry wall or steel I-beam
Decking is 1 x 6's

15

Characteristics of older flat roof (old-style)

20-30 years lifespan
3-4 in of tar paper
VERY substantial roof
Relatively safe to work (even over heavy body of fire)
Catastrophic roof failure NOT A CONCERN

16

Working fire on top floor of any large-area flat-roof requires:

At least 4 members with:
2 power saws, (2) 6 or 8 ft hooks (10 ft for large bldg, cockloft may be 5 ft), halligan, axe, portable radio-preferably officer experienced in ventilation

17

2 things done immediately upon reaching the roof:
(Vent)

Vent any vertical shafts (bulkhead doors or skylights)
Simultaneously, member can lean over parapet and vent top-floor windows in the fire area with hook or halligan tool clipped to short rope

18

Simplest, fastest examination hole: 1/4 in. by 10 in.

Kerf

19

Size of triangular opening for inspection

8-10 in triangle

20

First concern after choosing the proper site for venting roof:

Means of escape
Always have 2 ways off the roof

21

Second concern after choosing proper site for venting roof:

Wind direction-may be first if wind blows smoke/fire and cuts off retreat

22

When sounding roof, striking with an axe and tool has slight bounce means:

In between joists

23

Cut close to inside of joists: (2 reasons)

Large an opening as possible
Fewer nails to pull against

24

Roof hole subdivided into what size:

4 ft x 4 ft max

25

A spongy feel on an inverted roof means:

Normal for inverted roof
NOT a sign of impending failure

26

Spacing on uprights - inverted roof

Post 2 ft on center
Rows 4 ft on center
(P2R4 alphabetical)

27

Dangers of rain roof (3)

Added weight
Delay or prevent ventilation
Multiple voids

28

Insulspan is made of ______ and dimensions are ______.

Styrofoam sandwiched between OSB.
8 ft widths, up to 24 ft lengths

29

Insulspan difficulties (2)

Styrofoam = highly combustible and toxic smoke/intense flame
As much as 8 1/2 in. thick, circular 4 in. cut, chain saw 9 in. but chain guard doesn't readily allow deep cut

30

H-typed bldgs or H or E or O shaped
Primary factor in all of these is:
Fairly narrow connecting section called:

Common cockloft
Throat