Generac Power Systems 0661-5 - Manual (Page 19)

COMPARTMENT SIZE
Plan the compartment size carefully. Provide a mini­
mum of at least 1 inch (2” recommended) of clearance
between the generator and compartment walls and
1 inch (2” recommended) of clearance between the
generator and the ceiling AFTER you have lined the
compartment with metal, and AFTER you have
installed sound insulation (Figure 16).
NOTE: Refer to the “Dimensions and Features" draw­
ing in the back of this manual.
i
Figure 16 — Provide Clearance Around Generato
PLYWOOD
COMPARTMENT
11NCH MINIMUM CLEARANCE
ON ALL SIDES (Z" RECOMMENDED)
riTliVCl
TOP VIEW OF
GENERATOR
1 INCH
MINIMUM
CLEARANCE
ABOVE
GENERATOR
(2” RECOMMEND­
ED)
METAL UNING-
INSULATION
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 17).
Figure 17 — Typical Compartment Construction
Line the entire compartment interior with 26 gauge galva­
nized steel as described above.
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 mater­
ial. See “Sound Insulating Materials.”
A
DANGER: Do not install sound insulation or any
absorbent material on the compartment floor inte­
rior. Such materials will become soaked with com­
bustible or explosive vapors and liquids and will
become a fire hazard.
• 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 non-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.
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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