Generac Power Systems 0940-1 - Manual (Page 22)

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 compart­
ment with metal, and AFTER you have installed sound
insulation (Figure 18).
NOTE: Refer to the “Major Features and Dimensions”
drawing in the back of this manual.
Figure 18 — Provide Clearance Around Generator
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
CROS8«8ECTION VIEW METAL LIHIHQ
• 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 previously.
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.”
DANGER: Do not install sound insulation or any
absorbent materiai on the compartment fioor interi­
or. Such materials will become soaked with com­
bustible or explosive vapors and iiquids 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.
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 cush­
ions, fiberboard and other flammable materials. You
may need to use approved non-flammable insulat­
ing 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-flamma­
ble type. One excellent insulating material is a 1 inch
thick fiberglass having a 2-pound density. When fiber­
glass 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 mate­
rial. For example, a sheet of lead or visco-elastic mate­
rial, along with a layer of other acoustical material, is
more effective than when a single material is used.
Line the entire compartment interior with 26 gauge galva­
nized steel as described above.
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