This was the 1st box I built. I works great at keeping the rigs cool but I made the door too damned small! It's a pain to get in and out of that box if i need to work on any of the rigs in there. These pics below are from when I first put this together. Alot of changes and tweaks have been made since then. The dimensions are 4' x 5' x 4'. The filters for this box are 20" x 20" x 1". The fan on top is made my Utilitech as was purchased from Lowes for about $120.00 US. Here's a link - https://www.lowes.com/pd/Utilitech-Pro-24-in-2-Speed-High-Velocity-Fan/4755305
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The 2nd box, I built specifically to hold the two 7 card rigs I have. This box is absolutely fantastic for keeping these rigs cool. The only problem with it is that its a little too small. If I have to work on these rigs for any reason, there's no room to do so. I have to take the rigs out in order to work on them.. granted, this doesn't happen often but it has happened. The dimensions are 3' x 3' x 3' - just a 3 foot square box. The filters are 24" x 12" x 1" - The fan is a 20" Utilitech that i bought from Lowes as well- $45.00 US - here is the link - https://www.lowes.com/pd/Utilitech-20-in-3-Speed-High-Velocity-Fan/4755301
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The last box (above ) is the best one. This is great at cooling the rigs, it has plenty of room to get inside and work if i need to and the whole side is a door. The dimensions for this one are 4' x 4' x 4' - just a 4 foot square box. The filters and exhaust fan are the exact same as the 1st box.