I had the same vent issue with my 2015 Chateau. As per the comment above, I called Thor, they requested a photo and the new cover with no louvers arrived. I was very surprised I got the graphics with it. Then my happiness ended when I was all set to install the graphics and found two out of three where not what I needed. Email after email. Phone call after phone call. It took 6 months to get the correct graphics, and the only reason I finally got the correct graphics was because I went to the factory in Wakarusa Indiana and dealt with the customer service folks. They were helpful and due to the fact their are so many different graphics we went to the graphics department and matched the one that I had photos of from my coach. I cannot believe an engineer didn’t see the design flaw before any coaches got out the door. They will make it right, but it make take awhile..