Generac Power Systems 00862-1 - Manual (Page 19)

COMPARTMENT SIZE
Plan the compartment size carefully. Provide a mini­
mum clearance of 1/2 inch on the front and top, 1 inch
on thè sides, and 3 inches from the back for air circula­
tion AFTER the compartment has been lined with metal
and sound insulation (Figure 18).
NOTE; Refer to the “Dimensions and Features” draw­
ing in the back of this manual.
Figure 18 — Clearances
COMPARTMENT CONSTRUQION
The' generator is supplied with a sound attenuated
enclosure. For additional noise abatement, refer to
the “Acoustics" section for compartment construction.
• The generator compartment should be constructed of 1/2
inch thick plywood. .Make the compartment floor a double^
thickness of 1/2 inch plywood with the grain of the wood
at cross section for added strength (Figure 19).
Figure 19 — Typical Compartment Construction
CROSS^CnON VIEW UETAL UNIMO
• Line the exterior (underside) of the compartment floor
with 26 gauge galvanized steel.
• Vapor seal all compartment seams and joints, to prevent
poisonous, flammable or explosive vapors from entering
the vehicle interior. Refer to the sealant information as
noted below.
NOTE: Silicone rubber base sealant is an acceptable
caulking material. Pressing putty tape onto compart­
ment joints and seams is NOT acceptable.
• After the compartment has been metal lined and
vapor sealed, line the compartment interior walls
and ceiling with an approved, non-flammable
sound insulating material. See “Sound Insulating
Materials.”
• Openings in compartment walls for passage of
electrical conduit, conductors, hoses, cables, etc.,
must be made vapor tight with suitable caulking
material.
• Flexible conduit must be sealed internally at the
end where it terminates inside a compartment's
electrical junction box.
NOTE; The preceding is required because flexible
conduit, due to its unique construction, is not vapor-
tight along its entire length.
A
DANGER; Do not install any flammable material
directly above or around the compartment. Heat,
transferred through the compartment structure,
may be sufficient to ignite, char or discolor seat
cushions, fiberboard and other flammable materi­
als. You may need to use approved non-flammable
insulating materials in high temperature areas.
SOUND INSULATING MATERIALS
Once installers have determined that compartments
are properly constructed and metal lined, they can
add acoustical material. This may include additional
sealant or insulating material, to reflect noise away
from the vehicle interior.
Sound insulating materials should be of a nori-flam-
mable type. One excellent insulating material is a 1
inch thick fiberglass having a 2-pound density. When
fiberglass is used, its coated side should face toward
the compartment interior.
A
Line the entire compartment interior with 26 gauge galva­
nized steel as described above.
DANGER: Do not install sound insulation
or any absorbent material on the compart­
ment floor interior. Such materials will
become soaked with combustible or explo­
sive vapors and liquids and will become a
fire hazard.
Using a combination of sound insulating materials can
often reduce noise more effectively than a single
material. For example, a sheet of lead or visco-elastic
material, along with a layer of other acoustical materi­
al, is more effective than when a single material is
used.
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