I haven't added anything yet. I had them all mounted well away at the beginning and put them on the recommended location last year. I've thought about that being an issue as well. Looking inside, after 4 years of use, it's not too bad but could use something to prevent it in the future.
What's worse for it though? Dust or heat from not getting enough flow? I'll probably play with this over the weekend since you brought it back up in my mind.
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