4-2
WARNING
Fuel and fuel leakage present the
hazard of fire or explosion, which can cause se-
vere personal injury or death. The ventilation
system should provide a constant flow of air to
expel any accumulation of fuel vapor. The gen-
set compartment must be vapor-tight to the ve-
hicle interior to keep fumes from entering the
vehicle.
To obtain the 85 in
2
(548 cm
2
) free air inlet area,
Onan recommends bringing in cooling air through
the recreational vehicle skirt. This can be accom-
plished by using the access door, ducting into the
generator end from the side wall, or using the hori-
zontal area between RV skirt and the genset along
with the vertical area (if road splash is not a problem
—see the
Location and Mounting
section). See Fig-
ure 4-2 for reference to these areas. If the skirt of the
RV does not extend to or below the top of the genset
drip tray, provide an extension.
Air can be brought from under the RV for cooling.
However, run tests while the RV is both parked and
while moving at highway speeds to make sure of
proper cooling with this method. A temperature rise
between the outside ambient and air in the top
openings of the genset housing should not exceed
8F (4.4C).
FIGURE 4-2. AIR INLET ALTERNATIVES FOR UNDER-FLOOR MOUNT GENSET
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