An exhaust fan will work good, especially if the room where the closet is adjacent to is air conditioned. For the 240 cu ft closet, I would suggest a fan/light ventilator with a 120 cfm capacity. Mount the unit in the ceiling, run 3-inch flex aluminum from the fan to an exterior wall or roof jack.
You don't need to louver the doors - a 1-inch undercut (2-inches is better assuming a 28-inch door) will infiltrate the makeup air. This will effectively cool the closet, not to living room comfort but enough to keep your equipment from tripping on high heat overload.
You do not want to bring in outside air as the makeup - too much humidity in the summer. The interior 70 to 75 degree air is adequate.
Look into www.grainger.com for "bathroom ventilators", made by Broan. It's a start - and the cheapest way to go. Good luck.
You don't need to louver the doors - a 1-inch undercut (2-inches is better assuming a 28-inch door) will infiltrate the makeup air. This will effectively cool the closet, not to living room comfort but enough to keep your equipment from tripping on high heat overload.
You do not want to bring in outside air as the makeup - too much humidity in the summer. The interior 70 to 75 degree air is adequate.
Look into www.grainger.com for "bathroom ventilators", made by Broan. It's a start - and the cheapest way to go. Good luck.