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Chris, I had a small tin shed when I lived briefly on the Central Coast and it used to cook in there.
How I solved the problem was not to drag the heat out by fans but to prevent the heat getting in. How I did this was I attached 4" x 2" (about 90mm x 45mm in metric I think) lengths of pine to the top and bottom of the roof (1 foot over on each end). Then I ran 2"x 1" pine down and hung it over the edge about 2 feet. Then I simply stretched the heaviest grade Shade cloth (light colour) on the 2" x 1" pine and it kept the sun off the tin preventing it from heating up. Then I placed 4 vents in the walls. One on each side up near the top and one on each side at the bottom and that gave air flow. It became a nice cool garden shed on hot days!!
If the temperature happens to rise a bit inside, the heat rises and escapes out the top vents causing it to drag cooler air in the bottom vents.
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