Guardian Technologies 004702-0 Manual De Usuario

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• 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).

• 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 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. 

NOTE:

Flexible metal conduit, due to its unique construc-
tion, 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 6.6. 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 Section 6.2.3.

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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.

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