26 Generac
®
Power Systems, Inc.
Section 2 – Installation
IMPACT-36 plus II Recreational Vehicle Generator
2.3.2 COOLING AIR INLET OPENINGS
Ideally, you should provide three air inlet openings,
whether the generator is housed in a conventional
compartment or not. Two of the openings should be
10 square inches and located as shown in Figure
2.10. The third opening should provide for a mini-
mum of 40 square inches unrestricted and be locat-
ed lower on the compartment door.
NOTE:
Screening, louvers, or expanded metal that cover
air openings restrict air flow that you must com-
pensate for by making the actual air opening pro-
portionately larger. See “Compensating for
Restrictions.”
For conventional compartment mounted units, the
air inlet is generally provided in the compartment
door.
Figure 2.10 — Air Inlet in Compartment Door
IMPORTANT: IF YOU PLAN TO INSTALL THE GEN-
ERATOR IN A COMPARTMENT, BE SURE TO LEAVE
AT LEAST ONE INCH (2” recommended) OF
CLEARANCE BETWEEN THE GENERATOR AND
COMPARTMENT WALLS AND CEILING. INCLUDE
26 GAUGE GALVANIZED STEEL LINING AND
SOUND INSULATION WHEN YOU MEASURE FOR
THIS 1 INCH (2” recommended) CLEARANCE.
When the unit is installed on a suspended mounting
system, one of several different methods of supplying
air flow may be used as follows:
• Provide a door in the vehicle skirt having an air
inlet opening (Figure 2.11).
Figure 2.11 — Suspended Mount Inlet Door
• Using ductwork (Figure 2.12). The installer must
be sure air is available to the top of the generator
since air inlets are located at the top.
Figure 2.12 — Air Inlet Using Ductwork
• By providing an opening in the vehicle skirt and
space above the generator for cooling air flow
(Figure 2.13). Recommended clearance above the
top of the generator is at least 2 inches.
Figure 2.13 — Air Inlet in Vehicle Skirt
◆
10 Square Inches
(Optional Openings)
40 Square Inches
(Minimum Opening)
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