Generac Power Systems 004702-0, 004703-0, 004704-0, 004705-0, 004706-0, 004707-0 Owner's Manual page 26

• If the compartment is lined with galvanized steel,
it may be constructed of any material. The manu-
facturer recommends that the compartment be
constructed of 1/2-inch thick plywood (not strand-
board), with the floor made of a double thickness
of 1/2-inch plywood with the grain of the wood at
cross section for added strength (Figure 6.5).
Figure 6.5 – Typical Compartment Construction
• If constructing a compartment, line the exterior
(underside) of the compartment floor with 26-
gauge galvanized steel.
• All seams, splices and joints of the compartment
walls (unless vapor tight by design) should be
caulked to prevent poisonous, flammable or explo-
sive vapors from entering the vehicle interior.
Caulking must be done so that the caulking mate-
rial will stay in place permanently. Pressing such
materials as putty tape onto joints and seams is
not acceptable. A high quality silicone rubber base
sealant is recommended.
• Holes and openings made in the compartment
walls to allow for the passage of electrical conduit,
conductors, hoses, cables, etc., into the vehicle liv-
ing area must be sealed vapor tight with silicone
rubber base sealant.
• If flexible metal conduit is used, it must be sealed
internally at the end where it terminates inside the
compartment's electrical junction box.
Flexible metal conduit, due to its unique construc-
tion, is NOT vapor tight along its entire length.
24
Section 6 – Installation
Recreational Vehicle Generators
NOTE:
NOTE:
• Seams and joints of the galvanized steel (whether
used as a liner or for the compartment itself) must
be lapped and mechanically secured. Such seams
may be manufactured, welded, bolted, riveted or
screwed. Manufactured lock seams are shown in
Figure 6.6. Installer constructed compartments
typically utilize a standard lap joint.
Figure 6.6 – Types of Lock Seams
• After the compartment has been metal lined and
vapor sealed, line the compartment interior walls
and ceiling with an approved, nonflammable sound
insulating material. See Section 6.2.3.
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
materials. Use approved nonflammable insulat-
ing materials in high temperature areas.
6.2.3 SOUND INSULATING MATERIALS
Once installers have determined that a compartment
is properly constructed and metal lined, they can add
acoustical material. This may include additional seal-
ant or insulating material, to reflect noise away from
the vehicle interior.
Sound insulating materials should be of a nonflam-
mable type. One excellent insulating material is a 1-
inch (25 mm) thick fiberglass having a 2-pound den-
sity. When fiberglass is used, its coated side should
face toward the compartment interior.
DANGER

Do not install sound insulation or any absorbent
material on the compartment floor interior. Such
materials will become soaked with combustible
or explosive vapors and liquids and will become
a fire hazard.