Sound Insulation Materials; Compartment Roor Cutouts; Acoustics - Generac Power Systems NP Series Installation Manual

• 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 vehiclef interior.
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."
DANGER: DO NOT INSTALL SOUND INSULATION
OR ANY ABSORBENT MATERIAL ON THE COM¬
PARTMENT FLOOR INTERIOR. SUCH MATERIALS
WILL BECOME SOAKED WITH COMBUSTIBLE 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.
DANGER: DO NOT INSTALL ANY FLAMMABLE
MATERIAL DIRECTLY ABOVE OR AROUND THE
COMPARTMENT. HEAT, TRANSFERRED THROUGH
THE COMPARTMENT STRUCTURE, MAY BE SUF¬
FICIENT TO IGNITE, CHAR OR DISCOLOR SEAT
CUSHIONS, FIBERBOARD AND OTHER FLAMMA¬
BLE MATERIALS. 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.
COMPARTMENT FLOOR CUTOUTS
You rriust provide openings in the generator compart¬
ment for the following items (Figure 10):
• Engine exhaust and cooling air outlets
• Generator cooling air inlet
• Four holes for passage of generator mounting bolts. See
"Generator Restrainf on Page 6.
DANGER: FUEL UNES AND EXHAUST PIPING
MUST NOT PENETRATE INTO VEHICLE LIVING
AREA.
Figure 10 — Compartment Floor Cutout
If excessive noise levels should become a problem,
the installer may wish to consider the following:
• Using special sound insulating materials.
• Construction of a special noise abatement compartment.
IMPORTANT: ANY METHOD USED TO REDUCE
NOISE MUST NOT ADVERSELY AFFECT THE
FLOW OF COOLING AND VENTILATING AIR INTO
OR OUT OF THE COMPARTMENT.
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