Ventilation

Question 1

Generally where will backdrafts occur inside of a structure

Answer 1

In proximity to the main body of fire

Question 2

True or False. Regarding “Flow Path”, this can be a bidirectional or unidirectional flow dependent on the location of the main body of fire to vent openings

Answer 2

True

Question 3

Give an example of a Bidirectional flow path

Answer 3

Fire is in a single compartmented room
Note: As fire grows using available oxygen, the neutral plane drops lower in the open doorway. Hot gases exhaust above neutral plane. Fresh air is pulled in below the neutral plane

Question 4

Give an example of a Unidirectional flow path

Answer 4

A multi level compartment fire
Note: The neutral plane will be higher in this compartment. Fresh air pulls thru a doorway in 1 direction. Hot gases exhaust out of a vent point on the floor above in 1 direction

Question 5

Name 2 actions members must take when encountering “rollover” conditions

Answer 5

1. Open a hose line to cool the environment 2. Exit the fire area and control the door until the arrival of a line

Question 6

Changes of ventilation profile indicators must be communicated to who

Answer 6

Ladder Co. Officer and IC

Question 7

If an officer encounters high heat and heavy smoke without a charge line, what should he/she consider (2 answers)

Answer 7

1. Immediately exit the fire area

2. Limit additional ventilation

Question 8

Regarding safety teams, a known life hazard is defined as follows (3 definitions)

Answer 8

1. Victim can be seen by a rescuer 2. Victim can be heard by a rescuer 3. Member has info from a credible source or person at the scene and indicates location of the life hazard

Question 9

If smoke and fire are venting downward, horizontally or pulsing from an opening in the building will indicate what about fire conditions

Answer 9

Wind impacted

Question 10

Fire and smoke should be venting in what 2 directions

Answer 10

Outwards and upwards

Question 11

In addition to transmitting a 10-45 for a victim, name 2 other pertinent pieces of info that should be given to the officer or IC

Answer 11

1. Location 2. Planned exit route

Question 12

Name an occasion when limited ventilation of a fire apt. is justifiable if it facilitates search operations

Answer 12

When fire has not communicated to the floor above

Question 13

True or False. The change in fire dynamics of modern content fires require that all ventilation be controlled, communicated and coordinated with operations on the fire floor

Answer 13

True

Question 14

True or False. If vertical ventilation is delayed or withheld the bulkhead shall remained closed even to check for trapped occupants behind the door

Answer 14

False

Check for trapped occupants behind the door and then close it

Question 15

Additional venting such as the skylight shall be done during what phase of the fire

Answer 15

After the main body of the fire has been extinguished

Question 16

When a member on the exterior who’s waiting to perform vent and then hears “Start Water” and “We have water on the main body of fire”, this should be an indication to perform what action

Answer 16

PREPARE to conduct Ventilation and Extinguishment

Note: notify officer you are ready to vent. This ONLY applies to windows in immediate fire area

Question 17

In Low Rise MD’s, who gives approval to vent the bulkhead

Answer 17

IC

Question 18

In Low Rise MD’s, emphasis will generally be placed on venting which stairway

Answer 18

Attack Stairway

Note: This is done to relieve heavy smoke conditions that usually occur in the attack stairway