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go with computer fans - just keep adding them in an in-line fashion (entry and exit) until you get the right temp. inside the box. humidity should fall to a reasonable level if your air exchange is good enough. Heat rises, so the exit fan(s) should be at the top of the box - entry near the...

you can place a few small computer fans inline, and come out with a powerful blower.

yeah, you can get a fan which you fit into the duct work, and it looks nothing more then part of the run. but remember, forcing air up and out to a distance as high as your attic wil take some force, and a big fan.