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Mike,
I think you will need something more than just passive venitillation through vents if your shed is sitting directly on concrete, especially if it is not isolated from the ground by plastic sheeting. The concrete will abosrb moisture from the ground then this will evaporate into your shed during the hot days then condense when the temperature drops in the evening. Will need active air movement to battle this.
You have just entered the world of a powered exhaust fan to force air through your shed.
Cheers
Rob.
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