Anybody have a good method or an accessory to seal off a fan port on a computer case? The main reason for this is due to the fact that a past computer was ruined because cats decided to lay on my case and then subsequently puke on it. Needless to say, cat puke and electronics don't mix too well. I know that buying a case without an opening on top is likely the best idea, but so far I haven't found a mid-ATX case with USB 3.0 at a reasonable price. Any help will be appreciated.