600-21 Ventilation Practices

Question 1

It is highly recommended to __ before implementing PPV

Answer 1

gain control of the fire and evaluate avenues of fire spread

Question 2

To use PPV effectively remember the following procedures

Answer 2

1. Cover the entrance opening
2. Regulate exhaust opening
3. Control the flow between entrance and exhaust openings

Question 3

Exhaust openings should measure

Answer 3

between 3/4- 1 3/4 the size of the entrance opening

Question 4

Fire is in free burning stage and FF make/improve an exhaust opening for fire to vent, then use blower to slightly increase interior pressufre

Answer 4

Positive Pressure Attack (PPA)

Question 5

for PPA, the blower should be positioned

Answer 5

4-6 ft away from ventilation opening

Question 6

What are preferred exhaust openings providing more survivable conditions for victims

Answer 6

Windows

Question 7

Crews must not enter until the blower has pressurized the structure for how long?

Answer 7

Usually 30-60 seconds or until conditions improve and interior environment starts to clear

Question 8

If winds are greater than __mph on exhaust side of building, do not use PPA

Answer 8

20 mph

Question 9

Many factors effect where to vertical vent

Answer 9

1. existing openings (skylights, shafts, etc.)
2. type of construction
3. wind direction
4. roof sag