Years ago, when we were in Lake Forest, CA, our server closet was under the stairs. We called it the "sweat-box," and even though we kept the door wide open 24/7, we lost a hard drive or two before I outfitted it with a makeshift plenum (made out of a cheap blue tarp) in the ceiling cavity, and a pair of 24" box fans exhausting into the stairwell.

When we moved to Costa Mesa, I designed a new server closet with an industrial roof-mount exhaust fan and a perforated-steel security screen door. We call it "the cage."

Both places, we keep an ordinary red-alcohol bulb thermometer on the wall; nowadays, if the cage temperature starts to go up above 80 degrees, we crank up the speed control on the fan.

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