The Advent Air rooftop high-efficiency air conditioner was designed specifically for the rigors of the RV lifestyle. Ducted or non-ducted ceiling packages and heating element options are sold separately. Limited 2 year manufacturer warranty. Overload protectorNon-ozone depleting refrigerant (R410a)Aerodynamic and stylish shroudsThree fan speedsSilicone coating on cooling fins reduces freeze-ups and increases air-flow, which improves cooling efficiencyMore copper tubing (than the competition) in the evaporator and condenser coils increases cooling surface areaMetal construction and ridged chassis designPlug in controls - no miscellaneous wiringDucted and non-ducted ceiling assembliesPremium 1" thick water seal gasket and mounting pads provide support and reduce vibration for quiet operationRemovable air filterInstalls in standard 14-1/4" x 14-1/4" vent opening