Ch 9 pg 258-261

He prefers trench cut over strip ventilation for two reasons. First being that the trench should only be used a _____ tactic. Second The word trench implies a ___ opening is crucial to its effectiveness

He emphasizes that you must cut a _____ vent hole prior to the trench cut

The exception to cutting the main vent hole first is in larger departments where ___ or more saws are immediately available

About 20-__ ft away from the main vent hole should be sufficient, assuming that the main body of fire is below the main vent hole and not closer to the trench

The second consideration is to locate the trench by taking advantage of the buildings construction. Make the cut at the narrowest point usually called the ____

Personnel may find fire ____ (not true fire walls, but gypsum barriers that can be defended) usually at the wall between two apartments

Estimate the most likely ___ and the area of greatest ___ that can be protected and use the trench and hoselines at that point. The most likely direction of fire travel is usually the _____ side, but if no wind the ___ of the roof may come into play

The ____ of the roof may come into play with direction of fire travel if there is little to no wind

Inspection holes should be positioned on the fire side, _ or _ ft in front of the intended edge of the trench

Make two parallel cuts about _ ft apart from outer wall to outer wall of the building. Note the trench shouldn’t be made any narrower than _ ft or fire may jump past it

Next cut the trench into __ or __ ft long sections starting as close as possible to the outer walls and working your way to the center

Make knockouts on the ____ side where tools can grab the roofing.

All personnel on the fireside must have at least ___ ways of the roof not counting crossing the trench

___ or ___ hoselines should be placed on the top floor on the safe side of the trench

Allow one ___ in hoseline per room below the trench and ___ for every 15 to 20ft of trench on the roof

These lines should be committed ___ and separate from the attack lines

The FFs must have patience to wait until fire shows at the _____ holes on the fire side of the trench

It is perfectly acceptable to use hoses from either below or from the ___ to drive fire away from the trench

Trench cuts are particularly well suited for use in __ type of buildings. Other structures such as very long, relatively narrow ____ type apartment complexes may also be suitable candidates for trench cuts

A 75ft deep store would need two 75 ft long parallel cuts and 20 to __ 3ft long crosscuts to subdivide the trench into manageable pieces , for a total of more than ___ linear ft of cutting. Pg 431 says ___ linear ft of cutting

The ordinary factor found in H E O type buildings is a common cockloft over all of the ____. The adjacent a sections of large areas joined by a fairly narrow connecting section called the ____

Never ventilate where you will create an ____ problem

_____ is key to initiating protective action

Probably the greatest danger engaged in roof ventilation is the fellow ff. Particularly the member holding the ____ saw, but it could also be the member holding the axe, ___ of any other moving object in conditions of poor visibility

Train all FFs to never allow a spinning blade or chain to get more than __ inches above the roof. Don’t begin to gun the engine until you are about to penetrate the roof.

Steel plating is often encountered in ____ occupancies, such as jewelry and ____ stores and especially high crime neighborhoods. The plating consist of __ sheets of steel, from 1/8 to ___ in thick

Steel plating can weigh (_____ lb on a 20x__ ft roof) early collapse can occur. The presence of extra weight should be highlighted in department pre-plans and ___

The members assigned to roof ops should be the ____ that a department has to offer.

H type buildings varies in shape from H to __ to __. The primary factor is the common ____ over all the wings.

Making a trench cut is actually a process that should be divide into several steps: ____ the trench, cutting the ____ holes, cutting the ___, and ____ the trench

Trench Cut

Deep Opening

Main Vent Hole

4+ Saws Exception

Trench Cut Distance

Throat

Party Walls

Path Value

Roof Pitch

Inspection Holes

Parallel Cuts

Trench Cut Sections

Knockouts

Escape Routes

Hoselines Placement

Hoseline Allocation

Early Deployment

Fire Monitoring

Fire Driving

H-Type Apartments

75ft Deep Store Trench Cut