Generac®Power Systems, Inc. 23

6.1.4 GEN ERATOR RESTRAINT

Use four 3/8"-16 hardened steel bolts (Grade 5) to fasten
the generator to the supporting frame or the support tub-
ing. These bolts must pass through (a) the generator
mounting base, (b) the compartment floor (if a compart-
ment is used) and (c) the supporting framework (Figure
2.3). All bolts must be long enough so that when tight, at
least three threads are visible past the retaining lock nuts.
Refer to Section 2.2 for the location of the generator
mounting holes.

Figure 6.3 – Typical Generator Restraint

6.2 GENERATOR COMPARTMENTS
Whether the generator set is being installed inside a com-
partment specifically manufactured to house a generator
or inside a compartment that the installer constructs, the
compartment MUST meet certain specifications as out-
lined in the following sections:

6.2.1 COMPARTMENT SIZE

Plan the compartment size carefully. Provide a mini-
mum clearance of 1/2 inch (13 mm) on the front and
top, 1 inch (25 mm) on the sides, and 1/2 inch (13 mm)
from the back for air circulation AFTER the compart-
ment has been lined with metal and sound insulation
(Figure 2.4).
NOTE:
Refer to “Figure 1.2 – Major Features and
Dimensions” on Page 21.

Figure 6.4 – Clearances

6.2.2 COMPARTMENT CONSTRUCTION

• The generator compartment should be either con-
structed of, or lined with, 26-gauge galvanized steel.
NOTE:
Aluminum is NOT an acceptable alternative
to galvanized steel due to aluminum’s low
melting point.
• If the compartment is lined with galvanized steel, it
may be constructed of any material. Generac recom-
mends that the compartment be constructed of 1/2-
inch thick plywood (not strandboard), 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 2.5).

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.
NOTE:
Caulking must be done so that the caulking material
will stay in place permanently. Pressing such materi-
als as putty tape onto joints and seams is not accept-
able. 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, conduc-
tors, hoses, cables, etc., into the vehicle living area
must be sealed vapor tight with silicone rubber base
sealant.