Ch 13 pg 369-373

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Questions and Answers

High ex can be used to ____ or replace ____ nozzles, and in many cases It’s safer due to its ability to be applied from a safer area.

Augment Cellar

High ex is an extremely expanded solution of water, air, and _____ (____:1 to ____:1 ratio)

Detergent, 400, 1000

High ex foams primary function is to ___ an enclosure, thus pushing out the products of combustion and replacing them with a water solution, which will cool the source of fire.

Fill

When high ex foam is discharged into an area, an opening must be provided near the ____ ceiling spaces, preferably _____ the place where the foam is being injected.

<p>Upper, opposite</p> Signup and view all the answers

What is not one of the three factors to be present for high ex foam to work?

<p>There has to be enough heat to evaporate the foam and allow it to work (B)</p> Signup and view all the answers

In some cases of structural stability seems assured, as is likely for a ____ fire in a ______ concrete building, it may be possible and beneficial to gain control of the fire and then send crews in with hand lines for final extinguishment

<p>Cellar, reinforced</p> Signup and view all the answers

Light travels only a ___ feet in high ex foam and is widely diffused through all the bubbles

<p>Few</p> Signup and view all the answers

Sound is also muffled; the already muffled voices from within the SCBA facepieces can barely be heard _ or _ ft away

<p>3,4</p> Signup and view all the answers

Firefighters can breakdown the foam blanket by ______ movement or by use of a hose stream on ____ setting.

<p>Substantial, fog</p> Signup and view all the answers

What is not a circumstance listed for allowing members to enter a high ex foam blanket?

<p>Substantial overhaul is needed to fully extinguish (D)</p> Signup and view all the answers

Balloon framing was very common in homes built in the late ____ and early ____, particularly in the east and _____

<p>1800s, 1900s, Midwest</p> Signup and view all the answers

The second floor joist in balloon framing rest on a small board (__in) that is notched into the upright 2x4s called a _____ board.

<p>1X4, ledger</p> Signup and view all the answers

If fire is found in the walls of a ballon frame from the cellar fire the first line is stretched to the seat of the fire in the cellar, second as backup and the third line is stretched to the ___ floor or ____

<p>Top, attic</p> Signup and view all the answers

Start on the ____ walls and the plumbing wall behind the ____.

<p>Outer, toilet</p> Signup and view all the answers

A fire in a cellar or basement of a ballon frame house is one of the few cases where ________ in a private dwelling is justified.

<p>Roof ventilation</p> Signup and view all the answers

When high ex foam is discharged into an area an opening must be provided near the ____ ceiling spaces, preferably opposite the place where the foam is being injected

<p>Upper</p> Signup and view all the answers

If the fire in a basement or cellar is found in a ballon frame send the third line to the ____ or the attic

<p>Top floor</p> Signup and view all the answers

Basement fires are one of the few fires where residential vertical ventilation is needed to stop the fire from going into the attic or _____

<p>Knee wall</p> Signup and view all the answers

Flashcards

High-expansion foam (High EX) application

A firefighting technique using a highly expanded solution of water, air, and detergent to extinguish fires. It's applied from a safe distance.

High EX foam ratio

A 400:1000 ratio of water, air, and detergent in high EX foam.

High EX foam's primary function

To fill an enclosed space, displacing the fire's products of combustion and cooling the fire source.

Foam discharge opening location

Openings near the upper ceiling, preferably opposite the injection point of the foam.

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Foam application for structural stability

In some situations (e.g., reinforced concrete, cellar fires), foam can be used to control the fire before using hand lines for final extinguishment.

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Visibility in High EX foam

Light penetrates only a short distance and is widely diffused.

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Sound in High EX foam

Sound is significantly muffled in the foam blanket, reducing communication.

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Breaking the foam blanket

Firefighters can break the foam blanket using substantial movement or by use of a fog setting hose stream.

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Entering a High EX foam blanket criteria?

Entering the foam blanket is only possible in certain circumstances.

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Factors for high ex foam to work

The effectiveness of High EX foams depends on the presence of certain factors. Insufficient Heat is one reason why the foam may not be effective.

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