Dometic Peterbilt 379 CHASSIS User Manual download pdf (Page 10)

ENGLISH10

Peterbilt 379 Installation Guidelines

INSTALLING THE SUPPLY AIR DISTRIBUTION

For this installation, we will install 4" ducts. Depend-

ing on the capacity of the system, you may have

two or three vents supplied. You must use all vents

supplied with the kit to get the rated air ﬂow out of

the system.

This kit comes with a duct combiner that allows one

4" duct to be vented into the truck’s pre-existing air

distribution system. Find the combiner (Fig. 9), and

mount to the bottom of the plastic duct that runs from

the truck’s HVAC unit to the rear wall of the sleeper.

You will have to cut out the duct so that the ﬂapper

damper can operate. Secure with screws.

The remaining 4" grill(s) can be located wherever you

choose, however, be aware that cold air falls and hot

air rises. It is best to install at least one vent high in

the cab. Be creative. Use existing features to mount

grills or hide ductwork, such as: cabinets, closets,

bunk tray at the foot of the bed, wire chases, etc. The

bunk tray is a good way to use what is existing:

• On the 379, 70" sleeper, remove the bunk tray

at the foot of the bed. Cut a 5" hole in the metal

below, and a 4" hole in the bunk tray in the same

area. Mount one 4" vent into the bunk tray. Run

the 4" duct up through the hole in the metal, and

connect to the grill with a hose clamp. Replace

the bunk tray.

Figure 9 – Duct combiner

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Dometic Peterbilt 379 CHASSIS User Manual Page 10