Dometic 379 CHASSIS Installing The Supply Air Distribution, Peterbilt 379 Installation Guidelines

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.

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Figure 9 – Duct combiner

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