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Generac
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Power Systems, Inc. 27
Figure 2.10 – Air Inlet Using Ductwork
Figure 2.11 – Air Inlet in Vehicle Skirt
2.3.3 COMPENSATING FOR RESTRICTIONS
Materials, such as, screening, louvers, or expanded
metal, can restrict the free flow of air. Compensate for
this restriction by making the actual air opening pro-
portionately larger.
Some materials may offer only a 60 percent “free air
inlet area.” Other more efficient materials may pro-
vide up to a 90 percent free air inlet area. The per-
centage of free air inlet opening is usually available
from the material’s supplier or manufacturer.
To determine the actual air inlet opening size
required, divide 150 square inches (975 cm
2
)by
the percentage of free air inlet area for the mater-
ial you will use.
For example: If you plan to use screening with an 80
percent free air inlet area, divide 150 (975) by 0.8,
which results in 187.5 square inches (1,218.75 cm
2
).
Minimum actual size of air inlet opening in this case is
187.5 square inches (1,218.75 cm
2
).
2.3.4 TESTING THE INSTALLATION
Generac recommends testing the installation to be
sure adequate cooling airflow is available to the
unit, before placing the unit into service. If the unit
shows signs of overheating, you will need to
enlarge the air openings. Never place a unit into
service until absolutely certain that cooling and
ventilation is adequate.
NOTE:
You must test the installation, especially if you
bring in air from below the generator set.
2.4 DIESEL FUEL SYSTEM
The installation of a diesel fuel system (Figure 2.12)
for a recreational vehicle generator set must comply
with applicable codes, standards, and regulations.
The entire fuel system must be completely free of
leaks. There must be no possibility of fuel vapors
entering the vehicle interior.
Figure 2.12 – Generator Fuel System
All fuel types are potentially FLAMMABLE
and/or EXPLOSIVE and should be handled
with care. Comply with all laws regulating the
storage and handling of fuels. Properly install
and maintain the fuel system, and keep it
entirely free of leaks. Fuel vapors must
not enter the vehicle interior.
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Section 2 – Installation
QUIETPACT™ 65D Recreational Vehicle Generator