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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