| 摘要 |
A grain bin of a type having side walls and a perforated floor therein. A drying fan is connected to the bin below the perforated floor and a roof is rotatably attached to the grain bin. The roof has vanes thereon for catching wind and causing circulation of air through the bin, thereby causing ventilation of the bin. Means for rotating the roof when the wind is not blowing is also provided.
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