coordinated ppv Flashcards

1
Q

By utilizing mechanical fans, the natural ventilation process can be
dramatically assisted or replaced by forcing the movement of smoke to:

A
  • Allow the use of ventilation openings that are remote from the fire area
  • Overcome interior - exterior temperature differentials
  • Reduce the time necessary to ventilate a building
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2
Q

The positive pressure will be___at the top, bottom, and corners of the building
common to the pressurized air

A

equal

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3
Q

Compared to___, positive pressure ventilation is much
more effective at removing contaminants from a building.

A

negative pressure ventilation

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4
Q

Positive pressure is most efficient when the exhaust opening (heat hole, window, door,
etc.) is between___to one and |___ the size of the
entrance opening.

A

three-fourths (3/4) three-fourths (1 3/4)

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5
Q

Electric fans should remain in place___

A

throughout the investigation and overhaul phases of the operation.

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6
Q

Positive pressure fans will not work against a prevailing wind of __
or greater.

A

10mph

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7
Q

Optimum placement for a single blower is dependent on the
___ and the ______

A

size of the entrance opening and the CFM of the blower

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8
Q

Small blowers (18”) need to be ___ from entrance openings while larger blowers
(24”) can be placed__openings to properly cover the opening with
pressurized air

A

moved back, closer to entrance

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9
Q

If two blowers of unequal CFM are utilized in the series position, place the large blower
about two feet back from the entrance opening and utilize the smaller blower ___ to cover the entrance opening with pressurized air

A

behind the larger blower

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10
Q

Blower B is utilized to cover the entrance opening with pressurized air, force pressurized
air into the building, and increase the capacity of blower A by approximately ___

A

10%.

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11
Q

For standard entrance openings maximum effectiveness, can be achieved by placing
fans in a V-formation. This configuration is __ than multiple blowers in a
series configuration. The fans should be placed ___ feet from the opening and
angled slightly toward each other and with about 10 degrees of upward elevation.

A

more effective, four to six

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12
Q

To systematically ventilate a structure, begin with all of the doors closed and clear the
smoke from the rooms___

A

closest to the fan first

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13
Q

Removing screens on windows prior to using these openings for ventilation purposes will
increase the efficiency of these openings by at least __

A

50 percent.

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14
Q

___can be used as smoke curtains to cover unwanted openings or prevent
the contamination of unaffected areas

A

Salvage covers

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15
Q

Buildings with multiple floors can be ventilated by systematically ventilating each floor, as
in Figure 15. Start where there is ___

A

the most heat and smoke.

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16
Q

___ can be used with negative pressure ejector fans to remove smoke from an
area of a structure that has no exterior openings and is surrounded by areas of the
structure that are not contaminated.

A

Smoke tubes

17
Q

To set up a smoke tube operation, the door to the room is first sealed with visqueen and
duct tape. An ejector fan is then ___ and the tubes are
stretched to an exterior opening

A

hung on the door or door jamb