[wiredgeorge]

Scott, The WackO product is designed to replaced the lower panel on ducted Dometic system. Essentially the Dometic system has what is called a "quick cool" mode where you can open louvers on the main unit and cool air comes out and reduces the amount of air coming out of the duct opening elsewhere in the cabin. When you shut the louvers full air comes out the ducted openings. The "quick cool" mode is noisy becuase all the air is coming out of the A/C right at that panel. The WackO product eliminates the ability to use the quick cool mode by eliminating the louvers completely and just allows for air to be drawn in. They stick a piece of material inside and claim it deadens sound. Not sure how that would work but the Wacko product is likely about as quiet as the original Dometic cover with the louvers shut. You could always try this on your own without buying this gizmo by putting a piece of cardboard on the inside of your lower Dometic unit to cover the louvers tha open... tape it there and see if there is a difference in sound level; I am guessing not.