PPV

Question 1

Coordinated Positive Pressure Ventilation (PPV) will only be used by PF&R for smoke
removal after a _____ and it has been determined that no significant
fire extension exists.

Answer 1

fire has been knocked down

Question 2

is a method of ventilating a structure by mechanically blowing fresh air into a
structure in sufficient volume to create a positive pressure within, thereby forcing
contaminated air out an exhaust opening.

Answer 2

Coordinated Positive Pressure Ventilation
(PPV)

Question 3

Mechanical (gas or electric) fans used to pressurize a structure by blowing air
into a specified inlet opening to create or enhance a flow path carrying the products of
combustion from the interior of the structure to the exterior.

Answer 3

Blowers

Question 4

The key to effective PPV is controlling the flow path.
The flow path generally consists of the following;

Answer 4

1. Entrance or inlet opening.
2. Path of the interior air flow.
3. Exhaust opening.

Question 5

PPV is most effective when the exhaust opening is between___the size of
the entrance opening.

Answer 5

3⁄4 to 1 3⁄4

Question 6

Efficiency of windows for ventilation purposes can be increased ____by
removing the screens.

Answer 6

50 percent

Question 7

To ventilate an area without an exterior exhaust opening (e.g. basements, closets,
large windowless rooms)____ can be used

Answer 7

two blowers

Question 8

Multiple blowers arranged in a ____ pattern should be utilized to cover
large or wide entrance openings with pressurized air

Answer 8

side-by-side

Question 9

If two blowers of unequal size are utilized in-line, place the _____ blower about
two feet back from the inlet opening and utilize the smaller blower behind the
larger blower to seal the inlet opening with pressurized air.

Answer 9

larger

Question 10

If a gasoline-powered blower is being utilized and an exhaust odor is noticeable
inside the building, this is an indication that _____

Answer 10

the exhaust opening is not large enough.

Question 11

Multi-story buildings can be ventilated by sequentially ventilating each floor.
Start from ______

Answer 11

the lowest contaminated floor and work towards the top floor.

Question 12

Multi-story occupancies with enclosed central corridors can be effectively
ventilated with positive pressure by:

Answer 12

a. First, pressurizing appropriate corridors.
b. Second, ventilating pressurized corridors, if contaminants are present.
c. Third, ventilating contaminated rooms or other areas that are common to a
pressurized corridor.

Question 13

____ can have an adverse effect on PPV, depending on direction and velocity. If
possible, pressurize the structure on the windward side and exhaust contaminates
on the leeward side.

Answer 13

Wind

Question 14

PPV Limitations on Use

Answer 14

Combustible dust atmospheres, flammable vapors present, concealed space