The FreshJet 3 is Dometic's next-generation rooftop air conditioner engineered specifically for RV use. It delivers 13% more cooling capacity, 15% more airflow, and 50% less perceived noise compared to earlier Dometic rooftop units. Designed as a direct plug-and-play replacement for the Dometic Brisk II, it mounts to any standard 14 in x 14 in roof opening and supports both ducted and non-ducted installations -- no adapter required.
The FreshJet 3 series represents a full ground-up redesign of Dometic's most popular rooftop A/C platform. The aerodynamically optimized fan blade and scroll housing pull more air through the evaporator coil than the previous-generation Brisk II, which means faster cool-down times and better temperature uniformity from front to back of the coach -- without raising the noise floor.
At 13,500 BTU, the FJX3473MWHAS is sized for mid-length trailers, fifth wheels, and Class C motorhomes typically in the 23 ft to 35 ft range. It operates on standard 120V shore power or a generator, and is compatible with Dometic's Single Zone CT thermostat and compatible control kits for thermostat-controlled operation.
Redesigned evaporator and airflow path extract more BTUs per amp-hour versus the Brisk II platform.
Scroll-optimized fan housing and vibration-isolated compressor mount reduce cabin sound significantly.
Ships ready for non-ducted use. Accepts Dometic ducted distribution kits for duct-system installations.
Mounts to the same 14 x 14 in roof cutout and uses the same wiring harness -- no new penetrations needed.
The FJX3473MWHAS ships in non-ducted configuration, meaning cooled air is delivered directly through the ceiling assembly's return/discharge grille. For coaches with an existing duct system, the unit accepts compatible Dometic ducted ceiling assemblies and distribution kits, allowing airflow to be routed through existing ductwork to multiple registers.
If you are replacing a Brisk II in a ducted coach, confirm that your existing ceiling assembly is compatible with the FreshJet 3 mounting interface before ordering the ceiling assembly separately. The rooftop unit itself mounts identically to the Brisk II in both cases.
The FreshJet 3 uses the same 14 in x 14 in roof opening, the same gasket footprint, and the same 120V/15A wiring connection as the Dometic Brisk II (model families 540, 550, 551, 579, 640). No roof cutting, no new wiring runs. Bolt it down, reconnect the power lead, and reinstall the interior ceiling assembly.
The FreshJet 3 operates in multiple fan speeds (high, medium, low) in cooling mode. When paired with a compatible Dometic Single Zone CT thermostat (sold separately), the unit supports automatic thermostat-controlled compressor cycling and fan-only mode for ventilation when ambient temperatures allow.
The ceiling assembly included with this unit provides the interior air distribution and the wall-switch or thermostat interface. Fan-only mode is useful during shoulder-season camping when you want air circulation without running the compressor.
As with all rooftop RV A/C units, the mounting gasket is a compression seal only. You must apply compatible RV lap sealant (such as Dicor self-leveling lap sealant) around the perimeter of the base after torquing the mounting hardware. Failure to seal the roof perimeter can result in water intrusion and voided warranties. Torque mounting bolts to manufacturer specification -- overtightening can crack the roof decking or compress the gasket unevenly.