I
I
Duct
MINIMUM FREE AIRFLOW TO
GENERATOR
SET
COMPARTMENT
(MAY
BE
CUMULATIVE):
85
IN2
(548
cmt)
Skirt
RV
Floor7
1
,Skirt
Air
In
AIR INLET ACCESS DUCT FROM
BETWEEN
RV
SKIRT
Air
Out
DOOR AIR SIDEWALL
AND
GENERATOR
SET
INLET
TO
GENERATOR
FIGURE
7.
AIR
INLET
ALTERNATIVES
FOR
UNDER-FLOOR
,
MOUNT
GENERATOR
SET.
ACOUSTICS
The Onan housing kit for the under-floor mountgenera-
tor 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 compart-
ment penetrates floor, be sure all joints and comers of
the compartment are vapor-tight to the interior. Lining
the compartment is less effective if openings, cracks,
doors, and joints are not sealed. Also, seal compartment
door edge to eliminate noise leaks around the door
perimeter.
Cover the sound reflective surfaces, back, top and sides
(not compartment base) with fiberglass or other self-
extinguishing acoustical material. Acoustical material
and adhesive should be rated for use at
2OOOF
(90°C)
minimum.
Rather than using one single material,
a
combination
of
materials can reduce noise considerably. For instance,
a sheet of lead or viscoelastic material and a layer of
acoustical materials is more effective than either alone.
To reduce line of sight noise, a sound panel (baffle)
should be added behind theair inlet. The panel must be
spaced
to
allow for minimum free air inlet
of
85
in2
(548
cm2).
Referto Figure
8
to aid your generator set compartment
design and noise reduction plans. Size ducting to
ensure that minimum free airflow of
85
in2
(548
em*) is
still attained after acoustical material is added.
High
temperatures in the compart-
l3iE@@I
ment
can
present the hazard
of
fire
which
can resulf in severe personal injury
or
death.
To
meet
UL,
ANSl
and
CSA
femperafure rise requirements
for
recreational vehicles, insulafion
must
not
reduce
fhe
0.6
inch
(15
mm)
clearance specified.
11
Redistribution or publication of this document,
by any means, is strictly prohibited.
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