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BFD 12 Month Test Prep > Ventilation > Flashcards

Flashcards in Ventilation Deck (18)
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1
Q

At what percentage of oxygen does free burning become a smoldering fire?

A

13-15%

2
Q

Before venting, ti crucial to know the size and location of the fire as well as the ____?

A

Building type

3
Q

Breaking the glass and then cutting around three edges is a method used on ?

A

Wired glass windows for ventilation.

4
Q

Carbon monoxide and other products increase as oxygen drops below____ %?

A

17%

5
Q

Define reverse stack effect.

A

When outside air is warmer than inside.

6
Q

In the coffin cut, which cut should be the longest?

A

Third.

7
Q

On metal deck roofs, joists can be spaced ___ feet apart?

A

2-8

8
Q

Positive pressure hours not be used for ____?

A

Vent, enter, search.

9
Q

Opening the floor near an exterior window works for ___?

A

Basements with no openings.

10
Q

Punched, kerf, and triangle are three ___?

A

Names of inspection holes.

11
Q

Trench cuts should be ___ feet wide?

A

3

12
Q

What is 30 times more toxic than carbon monoxide?

A

Hydrogen Cyanide

13
Q

What types of roofs, under regular conditions, have spongy feel?

A

Inverted roofs

14
Q

When considering natural ventilation you must consider proximity to contaminants and ____?

A

Size of opening

15
Q

when oxygen levels in a fire decrease below 21%___?

A

Burning process reduces and smoke production increases

16
Q

When performing hydraulic ventilation firefighters must watch for ___?

A

Fire lighting up behind them

17
Q

Which of the following are indication on where to cut over the fire?

A

Asphalt shingles curling up, and a wet roof with dry areas.

18
Q

Which tool is not usually used in roof venting operations?

A

Pry bar