PURPOSE:To make it possible to use the same structure for upper and lower ventilation mesh boards which form both upper and lower grain drying chambers, air supply chambers, and exhaust air chambers. CONSTITUTION:The lower end section of each ventilation mesh board which forms each upper grain drying chamber 3, each upper air supply chamber 4 and each upper exhaust air chamber 5 is reinforced by fitting a lower reinforcing member 10 removably transversely and installing each positioning metal fitting 11 which determines the lower position of each ventilation mesh board 2 inside each sir supply chamber 4 and each exhaust air chamber 5 and mounting each holding fitting metal 12 which holds the lower reinforcing member 10 with the positioning metal fitting 12 in structure. However, this structure uses no lower part reinforcing member 10, positioning metal fitting 11 the folding fitting metal 12 for each lower ventilation mesh board 2. When the lower reinforcing member is detachable, the ventilation mesh board can be used in common for above and below.
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