Drying on concrete slotted ventilation floor Ventilation Floor Filling hall with product on concrete slotted ventilation floor. Product in bulk. Top view of storage room. Top view of pressure chamber with hatch control. Angular cut of slotted ventilation floor. Cross-cut of storage with slotted ventilation floor. Bulk storage on slotted ventilation floor. Construction of wall for underground aeration. Fan in pressure chamber. Air entrance under full-slatted floor. Bottom of slotted ventilation floor with slots. Example of slotted ventilation floor. Product on slotted ventilation floor. 3D model of slotted ventilation floor element. Retaining wall. Use of retaining wall in practice. Outside retraining wall.