Every rooftop air conditioner requires an air distribution box on the ceiling.
The Dometic Universal Air Distribution Box is installed on the ceiling by attaching to the underside of your Dometic rooftop air conditioner.
The ADB is for non-ducted applications only. It powerfully distributes the cool air throughout your mobile living space. For ease of installation and low maintenance, it uses simple manual controls located right on the unit.
This time-tested and affordable ADB is the standard for vintage travel trailers because it requires no additional thermosat wiring.