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Moveable drying screens like this are a great idea. All coffee is sun dried, and even a small rain storm can ruin it. Better than this, is to use the moveable screens underneath plastic covering, something ICS Peru promotes as Solar Tarps. That increases drying times, which should be 5-7 days to 12% moisture content. Coffee in Peru often takes 15-20 days or more to dry down to 25%, when the farmer sells it to the coop, a very bad practice. Zenon Humans coffee is dry in 6 days, he tells me.