To start with to control your water loss, you should try using a piece of gore-tex fabric between you funnel and the fan. I think it can flow enough air that you should be alright, however i can't tear my winter gloves apart just yet to test this for you. (it's still snowing here). I am looking into some fill ideas for you and will post when i have one written up. Gore-tex is a two sided material so if u try u must have the right side facing the fan....
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