coordinated ppv

Question 1

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

Answer 1

• 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

Question 2

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

Answer 2

equal

Question 3

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

Answer 3

negative pressure ventilation

Question 4

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.

Answer 4

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

Question 5

Electric fans should remain in place___

Answer 5

throughout the investigation and overhaul phases of the operation.

Question 6

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

Answer 6

10mph

Question 7

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

Answer 7

size of the entrance opening and the CFM of the blower

Question 8

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

Answer 8

moved back, closer to entrance

Question 9

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

Answer 9

behind the larger blower

Question 10

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 ___

Answer 10

10%.

Question 11

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.

Answer 11

more effective, four to six

Question 12

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

Answer 12

closest to the fan first

Question 13

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

Answer 13

50 percent.

Question 14

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

Answer 14

Salvage covers

Question 15

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

Answer 15

the most heat and smoke.

Question 16

___ 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.

Answer 16

Smoke tubes

Question 17

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

Answer 17

hung on the door or door jamb