PPV Set-up Procedures continued…
of the building and past the area to be ventilated.
The blower should be placed in the bottom
portion of the opening and will provide
pressurized air that will create positive pressure
within the area to be ventilated and force the
contaminants out of the upper portion of the
entrance opening. The air flowing past the
entrance opening will force the exhausting
contaminants to follow its direction to the exterior
of the building.
Fi
ure 5.3
Exhaust Opening
Positive pressure ventilation is most effective
when the exhaust opening (window, door, etc.) is
between three-fourths to twice the size of the
entrance opening (Figure 5.4). This variance is
due to the number and CFM’S of the blower(s)
utilized and can be summarized as follows:
PPV Set-Up Procedures 6.4
To Next Page
Loading...
