Well, what I'm toying with is the idea of having one cabinet containing more than one rig. Have the mb mounted on a drawer type system so you can pull it out to work on.
And having one cooling system for all of them, exhausting directly out of the room.
We use a similar system with our equipment in broadcast.
Of course those in colder climes can make the intake and exhaust switchable so you can use the heat for your room if needed.
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