Generac Power Systems 004703-1 Owner's Manual page 28

Installation
Figure 2.5 – Typical Compartment Construction
Caulking must be done so that the caulking material will stay in
place permanently. Pressing such materials as putty tape onto
joints and seams is not acceptable. A high quality silicone rub-
ber 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 living 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 construction, is NOT
vapor tight along its entire length.
• 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 2.6. Installer constructed compartments typically utilize
a standard lap joint.
• 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 "Sound
Insulating Materials".
26
NOTE:
NOTE:
Figure 2.6 – Types of Lock Seams
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.
2.2.3 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 sealant or insulating material, to reflect
noise away from the vehicle interior.
Sound insulating materials should be of a nonflammable type. One
excellent insulating material is a 1-inch (25 mm) thick fiberglass
having a 2-pound density. When fiberglass is used, its coated side
should face toward the compartment interior.

Do not install sound insulation or any absorbent

material on the compartment floor interior. Such
materials will become soaked with combus-
tible or explosive 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 material, is more effective than when a single material
is used.