you want your exhaust hole at the top of the closet, hot air rises, therfor by positioning at the top, you exhaust the hottest air, and your intake should be on or near the floor, you also want that hole to be slightly bigger than the exhaust hole. by putting it by the floor you bring in cooler air, and if you have a dark crawl space, the air should be plenty cool enough to keep temps ok in your room.

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