Generac Power Systems 009600-5, 009734-5 owner manual Sound Insulating Materials, Acoustics

Section 6 – Installation

PRIMEPACT 66G and 66LP Recreational Vehicle Generators

•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.

•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.

Figure 6.6 – Types of Lock Seams

transferred through the compartment structure, may be sufficient to ignite, char or discolor seat cushions, fiberboard and other flammable materials. You may need to use approved nonflammable insulating materials in high temperature areas.

◆6.2.3 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 nonflamma- ble 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 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 mater- ial. For example, a sheet of lead or visco-elastic materi- al, along with a layer of other acoustical material, is more effective than when a single material is used.

◆6.2.4 ACOUSTICS

For additional noise abatement, the installer may wish to consider the following:

•Using special sound insulating materials.

•Construction of a special noise abatement compart- ment.

NOTE:

•After the compartment has been metal lined and vapor sealed, line the compartment interior walls and ceiling with an approved, nonflammable sound insu- lating material. See Section 6.2.3.

Do not install any flammable material directly above or around the compartment. Heat,

24 Generac® Power Systems, Inc.

Any method used to reduce noise must not adverse- ly affect the flow of cooling and ventilating air into or out of the compartment.

In addition to the effective use of sound insulating mate- rials, construction of a special noise abatement com- partment might be considered to reduce noise levels. Such a compartment might be constructed as follows (Figure 6.7, page 25):

•Use 5/8-inch thick or 3/4-inch thick plywood in the compartment.

•Construct the compartment floor of a double thick- ness 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 galva- nized steel.