I haven't heard of wrapping boxes, and I doubt the fan is really necessary. But do what you wish.

I did this when I wanted to use a cooler:





Cedar trays unnecessary, especially if you're storing boxes. I was storing singles and just using boxes, haha

Then I decided to get fancy, and lost a TON of cooler space but added a bit of room-space and cool-factor by going vertical





at no point did I use anything for circulation. I also open all my coolers and wineador and humis more than I should, multiple times a week, so there's that too. But even if you don't, I'm pretty sure popping the top once a month is plenty enough, esp. if you're going for long-term storage and not constantly adding/removing things.

Overall - coolers are EASY. Do what you want and don't totally mess it up, and it should work just fine.