Steve and MA Posted July 31, 2022 Share Posted July 31, 2022 This weekend I thought I’d peek inside the Dometic AC ceiling distribution box in my 2022 EII with the idea of looking for a way to quiet it down. I did line it with Noico 80 mil butyl mat. Noise was only reduced by 1-2 dB, so hardly worth the effort, and any improvement by the mat is difficult to assess because of another issue that I corrected. After removing the distribution box, I found that the duct between the fan and the box wasn’t connected. The duct is a mylar tube wrapped with a wire coil. It’s supposed to be attached at the top with a zip tie around the flange by the fan. It's held in place by a grate at the bottom. In my case, the zip tie and duct were not completely wrapped around the flange. Though plenty of air seemed to be coming out of the five vents of the box, the gap was large enough that a good portion of the cold air must also have been redirected right back into the intake. It’s not easy working in the tight space, but I was able to reattach the duct. Hopefully it will remain connected. If you think you’re not getting enough air volume from the vents, then this may be worth looking at. I imagine this could affect the frequency that the compressor cycles, and possibly cause the evaporator to freeze over, but I hadn’t had these issues. I’ve attached pictures of the disconnected duct, as well as a picture from Dometic showing the locations of the eight screws that hold the box to the ceiling. The zip tie in the pictures is exactly like I found it. Steve 1 Steve H & Mary Allyn W San Antonio, TX 2022 LE II Hull #969 "Un Œuf", 2021 MB Sprinter 3500 "Polly", 2016 GMC Canyon 2.8L diesel "Max" Link to comment Share on other sites More sharing options...
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!Register a new account
Already have an account? Sign in here.Sign In Now