Yeah, I thought that the window was the culprit. I haven't tried it, but as a wild idea, you couldn't just use the other side panel? I've never heard of anybody doing that nor have I tried myself, so I wouldn't know. I assume the hooks are in separate places but just maybe? I know Antec sells replacements online. My gut tells me it won't work, but maybe if I suggest selling a plain panel, think they would bite? I'm not too tool handy, though I'm willing to learn, of course. I'm not too interested in having an open window, so maybe I'll rivet a new panel on. Would it work if I removed the side fan holder, cover the vent, flattened the surface, and just applied dampening material to cover it?