some pipe
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basically you put a baffle on each side of the container and fill the container with your favorite water absorbent material, hook the pipe to one and the other side of the pipe to the fan and there you go.
here is my diagram its just the rough sketch i will be building it tomorrow and will take some pictures, let me know if you have any questions
key design feature is the baffles, it keeps the water absorbent material isolated from the air to keep it from lowering the humidity but kick on the fan and the baffles open, the fan sucks the over saturated air through the container over the material and releases the dryer air.
thanks