It may seem obvious but make sure you can get AC after hours. In our building we have HVAC that shuts off at night. While I have complete control over my own server room unit I cannot count on any airflow being maintained after hours to my telco closet. The building owners won't leave a rooftop unit on just for us so I needed to make other arrangements.
Since the heat load in the closet is fairly low, I just took a 12 inch fan from an old rack and used it to blow the warm air up into the plenum. Ejecting the stagnant air and drawing fresh air in under the door is enough to keep that room within an acceptable range. -jake
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