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Figure 2.6 – 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 the
"Sound Insulating Materials" section.
DANGER
Do not install any flammable material directly
above or around the compartment. Heat, trans-
ferred through the compartment structure, may
be sufficient to ignite, char or discolor seat
cushions, fiberboard and other flammable mate-
rials. Use approved nonflammable insulating
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.
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.
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.
2.2.4 ACOUSTICS
For additional noise abatement, the installer may wish to consider
the following:
Using special sound insulating materials.•
Construction of a special noise abatement compartment.•
NOTE:
Any method used to reduce noise must not adversely affect the
flow of cooling and ventilating air into or out of the compart-
ment.
In addition to the effective use of sound insulating materials,
construction of a special noise abatement compartment might be
considered to reduce noise levels. Such a compartment might be
constructed as follows (Figure 2.7):
Use 5/8-inch thick or 3/4-inch thick plywood in the compart-•
ment.
Construct the compartment floor of a double thickness of 5/8-•
inch or 3/4-inch plywood.
Line the compartment interior walls and floor, as well as the •
underside of the floor, with 26-gauge galvanized steel.
Vapor seal all compartment seams and joints.•
Over the galvanized steel lining, install a combination of acousti-•
cal materials as mentioned in the "Sound Insulating Materials"
section.
DANGER
To prevent fire or explosion, do not install any
insulation or other absorbent materials on the
interior or underside of the compartment floor.
Seal all compartment door edges to prevent noise leakage •
around the door perimeter.
Line the compartment door interior (except for air openings) •
with suitable, fireproof sound insulation (such as 1-inch (25
mm) thick fiberglass with a 2-pound density).
Figure 2.7 – Typical Noise Abatement
Section 2 – Installation
Recreational Vehicle Generator