Ventilation

Question 1

What are the 3 types of ventilation?

Answer 1

1. Horizontal
2. Vertical
3. Positive pressure

Question 2

Synthetic products after 1970 now cause IGNITION to FLASHOVER how much faster?

Answer 2

30 times!

Question 3

What is the primary responsibility of the 1st due truck on a box?

Answer 3

Life safety

(Entry, search rescue, horizontal ventilation)

Question 4

What are the 4 position names of a truck crew?

Answer 4

Irons
Hook
AO app operator
OV outside vent

Question 5

What are the 3 operational modes of a truck crew?

Answer 5

All in for search
All out for ventilation
Splitting

Question 5

Where should ventilation openings never be created?

Answer 5

Behind an advancing hose line

Question 6

What is proper timing considered regarding COORDINATED ventilation?

Answer 6

Interior crews breathing SCBA and have a charged hose line in position, making a push or actually hitting the fire

Question 7

Where is proper placement of a heat hole for vertical ventilation?

Answer 7

As close to directly over the fire as safely possible

Question 8

Where is proper placement of a horizontal ventilation opening?

Answer 8

On the OPPOSITE side of the fire room from the advancing hose line

Question 9

What should you not do if the location of the fire is unknown?

Answer 9

DO NOT break windows!!

Question 10

What are the responsibilities of the second due truck?

Answer 10

Assist first due truck with unfinished responsibilities
Ladder upper floors for egress

Question 11

What are the 3 critical radio communications made by 1st due engine specific to horizontal ventilation?

Answer 11

Fire attack is making entry
Location of fire
Take the glass

Question 12

What is the appropriate tactic if it is believed that Backdraft conditions exist?

Answer 12

Vertical ventilation

Question 13

What are the 3 kinds of roof holes?

Answer 13

Inspection hole
Smoke indicator hole
Heat hole

Question 14

What size heat hole should you cut?

Answer 14

4x4 on residential
4x8 on commercial

Question 15

Is a heat hole offensive or defensive?

Answer 15

Offensive

Question 16

Is a trench cut offensive or defensive?

Answer 16

Defensive

Question 17

What should the spacing be for indicator holes?

Answer 17

Every few yards

Question 18

What is the initial width of a trench cut?

Answer 18

24-48”

Question 19

When assigned to the roof what direction should you approach if possible?

Answer 19

Windward side

Question 20

When a structure has a flat roof, where should you place the ladders?

Answer 20

On the corners

Question 21

What must a roof crew establish as soon as possible?

Answer 21

A second means of egress

Question 22

Does Portland fire use PPA attack?

Answer 22

No

Question 23

When will Portland fire use ppv?

Answer 23

Only used for smoke removal after a fire has been knocked down

Question 24

PPV is most effective with what size exhaust opening?

Answer 24

3/4 to 1-3/4 size of entrance

Question 25

Does the heat of a fire increase or decrease interior room pressure?

Answer 25

Increase

Question 26

Because today's fires develop more rapidly, firefighters often arrive on scene when?

Answer 26

Just PRIOR to or DURING flashover!

Question 27

Ventilation is defined as the systemic and coordinated removal of what for structure involved in fire?

Answer 27

the PRODUCTS OF COMBUSTION

Question 28

What does "Take Glass" mean?

Answer 28

Used to let team know its an appropriate coordinated time to break a window

Question 29

What is the Heat Release Rate?

Answer 29

The RATE at which HEAT (energy) is RELEASED by the burning of FUEL and OXYGEN Also a MEASURE of the SIZE of the fire compared to the THERMAL HAZARD or EFFECTS of the fire

Question 30

Increase in the HRR will increase what 2 things?

Answer 30

HEAT and SMOKE production

Question 31

What is the difference between Venting for LIFE and Venting for EXTINGUISHMENT?

Answer 31

LIFE attempt to reach a known/suspected life hazard EXTINGUISHMENT

Question 32

What are the 2 keys to any type of successful ventilation opening?

Answer 32

1. Proper placement 2. Proper timing

Question 33

What are 3 indicators and ways that confirm proper ventilation timing?

Answer 33

1. Visual confirmation 2. Radio communication with interior crews 3. Other (Audible hose sounds, smoke turning to steam)

Question 34

What is the difference between NATURAL and FORCED ventilation?

Answer 34

NATURAL (wind) FORCED (Negative, Positive, Hydraulic)

Question 35

What are some things to look at on the roof to tell you a good place for heat hole placement?

Answer 35

Building construction Smoke conditions Pressurized smoke between shingles Bubbling tar Sagging area

Question 36

A heat/vent hole is generally placed how high on the roof?

Answer 36

At the highest point possible

Question 37

Describe an OFFENSIVE and DEFENSIVE ventilation cut?

Answer 37

OFFENSIVE heat hole DEFENSIVE trench cut

Question 38

Should you cut a heat hole before a trench cut?

Answer 38

Yes if the fire has not yet naturally vented

Question 39

Can you start pulling panels before the trench cut is finished?

Answer 39

NO. It will bring the fire too fast

Question 40

When doing a trench cut, where should the indicator holes be placed?

Answer 40

Every few YARDS between heat hole and trench cut

Question 41

Flat or arched roofs will usually require at least how many truckies?

Answer 41

Full 4 person crew

Question 42

On PEAKED roofs, where is desired ladder placement?

Answer 42

In close proximity to desired hole location

Question 43

Lightweight roofs can fail within how many minutes of fire impingement?

Answer 43

5