These little blank panels are quite expensive for what they are but I wouldn't mind if they did a good job. They don't form a completely airtight seal and due to the way the flex is done they allow a lot of air past the liners. Normally this wouldn't be a huge problem, but a rack that will soon be outfitted with gaskets and filters for use in dirty environments requires a little extra work with tape that could have been used for a lot less in the first place!
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