Ch. 15 Mission of Extension

Question 1

The mission of _________ is to check areas _______, __________, and _______ the main body of fire for extension AND to report findings back to command.

Answer 1

Extension.

Above, SURROUNDING, below

Question 2

More than ______ of our fires are handled by ONE line and _________ can check for extensions after the fire has been knocked down but prior to overhauling (or during overhauling).

Answer 2

90%.

Attack

Question 3

For the most part, it is ________ responsibility to check for extensions.

Answer 3

Attack’s

Question 4

Instances in which command may want a timelier accounting of extension of fires: (4)

Answer 4

Occupied wood-frame structure OTHER than a single-family dwelling (apartments/balloon frame MDs) (Spread-ALL directions).
Structures that share the SAME cockloft/attic (row houses, vert/horiz spread).
HIGH-rise structures (autoexposure)(vertical spread).
STRIP malls ("disposable buildings")(horizontal spread)

Question 5

Fire spreading from floor to floor through outside fire extension via Windows

Answer 5

Autoexposure.

Also called Lapping

Question 6

___________ multifamily structures are extremely prone to fire spread in ALL directions

Answer 6

Older balloon-frame

Question 6

For the most part, the most significant spread of fire is ________.

Answer 6

Upward.

Question 7

______ and ________, to a large extent, influence spread and thus extension of fire.

Answer 7

Construction type.

Method

Question 8

With rated and properly installed and maintained doors, _________ tend to become very compartmentalized.

Answer 8

Concrete structures

Question 9

_______________, especially ___________, are extremely prone to spread and thus extension of fire.

Answer 9

Wood-frame structures.

Balloon frame

Question 10

______ of the fire in urban areas of the United States are incendiary.

Answer 10

40%

Question 11

With incendiary fires, the fires may also be ________ in the means of egress of the arsonist, which is another reason to check for ____________.

Answer 11

Trailered.

Extension

Question 12

Three places need to be checked when looking for fire extension - in order of importance

Answer 12

Above.
Around.
Below

Question 13

Above, around, below.
Normally, _____ crews will handle the wall surfaces in the fire room. ____ crews should check wall assemblies in the room around the fire area.

Answer 13

Attack.

Extension

Question 14

Usually, fire will spread ____________ by convective currents inside wall assemblies, radiant heat, conduction and direct flame impingement. No matter what the fire route, ________ must be considered.

Answer 14

From room to room.

Horizontal spread.

Question 15

Above, around, below (where to check)

Fire can drop down into the floor joist system and travel horizontally in _______ and _________ construction.

Answer 15

Platform.

Balloon

Question 16

Areas at ___________ should also be checked. This is the general avenue of travel from floor to floor. Heat traveling convectively can reach ________ and higher.

Answer 16

Top of stairs.

1,400F

Question 17

Finally, the check for fire extension should proceed

Answer 17

In the direction of the wind.

Question 18

When checking HORIZONTAL spread around the fire room, consider following THREE factors:

Answer 18

Location of the original fire.
Wind direction and speed.
Construction features.

Question 19

Location.
Fires started by whatever means in ____________ will require more horizontal checking than fires originated in ____________.

Answer 19

The center of the structure.

Areas bordering exterior walls

Question 20

These factors significantly influence interior fire travel and thus area of possible horizontal extension.

Answer 20

Wind direction and speed

Question 21

Same rules basically hold true checking for extensions _________ as for ______________. Start in areas __________ the room and move into areas in the DIRECTION in which the wind is TRAVELING.

Answer 21

Above the fire, Areas below the fire.

Directly below the room

Question 22

Construction features.

These allow furnace heat to pass from one duct to be shared between rooms, allowing for horizontal spread.

Answer 22

Wall registers

Question 23

Truss floor assemblies (good/bad news)

Answer 23

Good-newer and used in platform (less spread).

Bad-due to error or neglect, fire allowed in, fire loads and oxygen are GREAT.

Question 24

Specific tools to check for extension. FIRST tools of choice are:

Answer 24

Firefighter senses (SSF).

Sight.
Sound.
Feel.
Same as first 3 of SHTSC - HOT

Question 25

Senses-Sight.

Good indicators of potential spread

Answer 25

Force and color of smoke

Question 26

Senses - Feel.

Check for heat (balloon and platform)

Answer 26

Balloon - directly over wall channels in attic.

Platform - locations at which the double plate and rafters meet.

Question 27

Rule of thumb for feel and heat

Answer 27

Bare hand as long as “it’s not hot chief”.
Works best on lath and plaster.

HOT - 15 sec/2 min rule

Question 28

Dry walls ability to collect and retain heat:

Answer 28

ENdothermic material

Question 30

Property conservation.

When checking for extension: (2)

Answer 30

Check for extension to ensure fire has been confined.

Open up with caution and prudence.

Question 31

Hand tools for extension (3)

Answer 31

Fire axes.
Pike poles.
Closet hooks.

Question 31

In vacant structure, command can assign company to extension and, after it gives benchmark (___________), can reassign the company to __________.

Answer 31

Extension areas checked.

Search

Question 32

At normal working house fire, rarely assign an extension officer for two reasons:

Answer 32

Most fires handled by one line.
-attack can check
Don’t have the personnel.
-big 4 take up allotment (avsb)

Question 33

If extension officer feels uncomfortable, once notified COMMAND has 3 options:

Answer 33

Extension out and ANOTHER company to Attack.
Extension out to get another line, CHANGE designation to Attack.
Extension out and ORIGINAL Attack moves to extinguish.

Question 34

Extensions judgement may have _______ on the outcome of the fire.

Answer 34

Great bearing

Question 35

Responsibilities of extension (3)

Answer 35

Safety of crew.
Check the area above, around, and below fire.
Keep command informed