PPV Set-up Procedures continued…
back to achieve proper coverage of the entrance
opening with pressurized air, move it as far back
as possible from the entrance opening. This
technique can be used effectively on raised
porches to achieve a seal.
Multiple Blower Placement
The use of more than one blower can dramatically
increase airflow (volume) and reduce the time
necessary to complete a ventilation operation.
For standard entrance openings (that is, door
openings of three feet by six and one-half feet),
maximum effectiveness is achieved by placing
two blowers "in-line" with each other. As in
(F
igure 5.2)
, blower A is positioned about two
feet from the entrance opening. This ensures that
all of the pressurized air from the blower enters
the building, yet allows sufficient room for
personnel to enter and exit the building. Blower
B is then positioned behind blower A. The proper
location for blower B is determined by the
Figure 5.2
distance necessary to cover the entrance opening
with pressurized air. Blower B covers the
PPV
Set-Up
Procedures
6.2
