Chapter 10-Ventilation

Question 0

Common advantages of ventilation fire: (6)

Answer 0

Rescue operations
Fire attack/extinguishment
Property conservation
Fire spread control
Reduction of flashover potential
Reduction of backdraft potential

Question 1

A trench cut as described in LA Counties truck manual is 3’ wide. In essentials a trench cut is described as ____ wide extending from one exterior wall to another.

Answer 1

4’

Question 2

Considerations affecting the decision to ventilate

Answer 2

Life safety hazard
Visible smoke conditions
The building involved

Question 3

High-rise buildings – the personal demand for this type of building is approximately ________as great as required for an average residential fire.

Answer 3

4 to 6 times

Question 4

Natural vertical spread of heat and smoke through a high-rise building:

Answer 4

Stack effect

Question 5

Hitting highest horizontal barrier and banking down

Answer 5

Mushrooming

Question 6

For fire attack in a high-rise always try to use a stairway which has __________.

Answer 6

Access to the roof

Question 7

For ventilation of a roof one large ___________opening is better than several small ones

Answer 7

4’x4’

Question 8

A cut that is the width of the sawblade to determine the direction of fire

Answer 8

Kerf cuts

Question 9

A hole made with three cuts forming small triangles

Answer 9

Inspection holes

Question 10

Wall studs run continuously from foundation to roof, no fire stops.

Answer 10

Balloon frame construction

Question 11

Direct ventilation of basements can be done in several ways: (4)

Answer 11

Ground-level windows (horiz. Vent)
Interior vertical shafts
Natural path such as stairwells
As a last resort, cut a hole in the floor near a ground-level door or window

Question 12

Elevated streams are frequently used to lessen sparks and flying embers from a burning building, but never ______________.

Answer 12

Directed into the ventilation hole