N.N., Ventilation systems for grain storages: a) rectangular crib with open wire mesh or slatted sides (triangular ventilator optional), (b) suction type of roof ventilator, tight sorides, perforated or slatted floor; (c) positive-pressure type of roof  ventilator, center flue, perforated sides and bottom; and (d) horizontal-flue type of ventilation. AgTecCollection: Lehrstuhl für Landmaschinen TUM / Renius, TU München 2005,https://mediatum.ub.tum.de/1240873