Ch 16 Ventilation

Question 1

Basic Ventilation Safety

Answer 1

1. Ladder 8 feet from corner strong areas
   
   • —avoid doorways and window
2. 2 Ladders and 2 means of escape
3. Approach from uninvolved to fire involved area. Use wind if possible
4. Always work in teams of 2.
5. Work from weak to strong heading towards escape.

No Cross Country
Stay on structural members

Question 2

Ventilation Size Up Considerations.

Answer 2

1. Type of Construction (heavy timber, light weight)
2. Age of building Pre-1950 Conventional Lumber
3. Location and extent of the fire
4. Effective height
5. Smoke conditions / wind direction
6. Gabel vents
7. Back draft
8. Strategic mode, interior attack hose lines.

Question 3

What is the primary firefighting hole called?

Answer 3

Heat hole

Question 4

What size hole is needed?

Answer 4

10% of the area involved.

Question 5

Strip ventilation described

Answer 5

A long hole cut to prevent the spread of fire
Fire break to get ahead of fire
Must be supported by hose lines and heat hole
Always defensive
Can draw fire.

Question 6

What cut (heat hole) is needed for a center hallway apartment or hotel?

Answer 6

Center Hallway Cut

Question 7

What is the primary objective of a heat hole?

Answer 7

Direct removal of heat and smoke.

Question 8

Is a heat hole offensive or defensive?

Answer 8

Offensive

Can be instrumental in transition from defensive to offensive mode.

Question 9

proper and effective ventilation helps with?

Answer 9

Making conditions that allow FFs to gain access to seat of the fire.
Prevent backdraft.

Question 10

4 types of lightweight construction

Answer 10

Panelized
Wooden I-beam
Metal gusset plate
Open web truss

Question 11

Why do you avoid using the rotary saw on light weight construction roof ops?

Answer 11

Can’t feel the members

not deep enough

Question 12

Drop cuts

Answer 12

Emergency or life threat only.

Not acceptable to drop anything

Question 13

Pull back cut operation

positions

Answer 13

Panelized roofs
Work from purlins

Saw
Puller
Puller
Saw

Question 14

What are the strong areas of a panelized roof?

Answer 14

Lam beams
Purlins
Ledger

Question 15

What is mushrooming?

Answer 15

Smoke banking down and pressurizing unable to escape.

Question 16

Ventilation strategy and strategic priorities.

3 Strategic considerations

Answer 16

Life Safety
Incident stabilization
Property Conservation

Question 17

Describe conventional construction

Answer 17

Heave dimensional lumber
Rafters and Joist 2x6 or larger
Decking 1x6
Relatively safe for firefighting. 
pre 1960

Question 18

What type of heat hole for Gabel Roof

Answer 18

Center or parallel rafter cut.

Question 19

4 Reason for horizontal ventilation

Answer 19

1. No attic space
2. Building has high walls and windows.
3. no attic involvement
4. Floors of a multi-story building

Question 20

High and low windows which do you open first?

Answer 20

High to let hot gasses out then open lower.