4-3
ACOUSTICS
The Onan housing kit for the under-floor mount gen-
set contains acoustical material to minimize noise.
Additional insulation is not necessary. If, however,
you are constructing your own compartment or
housing, use the following guidelines.
For the conventional compartment mount, if
compartment penetrates floor, be sure all joints and
corners of the compartment are vapor-tight to the
interior. Lining the compartment is less effective if
openings, cracks, doors, and joints are not sealed.
Seal the compartment door edge to eliminate noise
leaks around the door perimeter.
Cover the sound reflective surfaces, back, top, and
sides (not the compartment base) with fiberglass or
other self-extinguishing acoustical material. Acous-
tical material and adhesive should be rated for use
at 200F (90C) minimum.
Rather than using one single material, a combina-
tion of materials can reduce noise considerably. For
instance, a sheet of lead or viscoelastic material
and a layer of acoustical material is more effective
than either alone.
To reduce line-of-sight noise, a sound panel (baffle)
should be added behind the air inlet. The panel
must be spaced to allow for minimum free air inlet of
85 in
2
(548 cm
2
).
Refer to Figure 4-3 on Page 4-4 to aid your genset
compartment design and noise reduction plans.
Size ducting to make sure that minimum free airflow
of 85 in
2
(548 cm
2
) is still attained after acoustical
material is added.
WARNING
High temperatures in the compart-
ment can present the hazard of fire which can
result in severe personal injury or death. To
meet ANSI and CSA temperature rise require-
ments for recreational vehicles, insulation must
not reduce the 0.6-inch (15-mm) clearance spe-
cified.
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