Tac Vent

Question 1

Signs and symptoms of a flashover

Answer 1

• Ventilated fire
• Rapid increase in temp
• Flames in the over pressure
• Lowering of the over pressure
• Increased rate of pyrolysis at low level
• An increase in the speed and / or turbulence of the gas flow indicates that the situation is moving rapidly towards fully developed

Question 2

Signs and symptoms of back draft

Answer 2

• Limited ventilation
• Oily deposits on windows etc
• Hot doors and windows
• Pulsating smoke and gases from gaps around the doors / windows
• Lack of visible flame

Question 3

If attacking a fire externally, prior to BA teams attacking, what stream of water must be used?

Answer 3

A jet (straight stream)

Question 4

When using a direct attack on the seat of the fire a narrower cone or straight jet should be utilised. Why is this?

Answer 4

They have more penetration of the fuel source enabling quicker more efficient cooling of the fuel.

Question 5

When creating a vent in a fire compartment what is the ideal location for the vent?

Answer 5

As close to the fire as possible

Question 6

Thick dark smoke is a sign of what?

Answer 6

Contains more unburnt fuel

Question 7

How does ventilation influence a fire?

Answer 7

Ventilation supplies more air to a fire thus increasing its intensity

Question 8

Fuel controlled fires are found in what stage of fire development?

Answer 8

Early stages

Question 9

Ventilation controlled fires are found at what stage of fire development?

Answer 9

Flash over stage

Question 10

Ventilation controlled fires produce a lot of smoke true or false?

Answer 10

True

Question 11

What is phase 1 PPV?

Answer 11

Sequential ventilation. Getting rid of smoke after an incident

Question 12

What is phase 2 PPV?

Answer 12

When crews create a vent (tac vent!)

Question 13

What is phase 3 PPV?

Answer 13

When a vent is already available on arrival