Abstract: The grain floor system uses floor plates of substantially uniform size, for example, three feet in width and seven feet in length which are corrugated and which are nestable one within the other for storage and for transportation. The floor plates are mounted on an air frame system and have hooded openings to form air holes over an extensive portion of the floor plates such as, for example, about ten percent of the floor area. The hoods are formed to project outwardly of inclined corrugated sidewalls to limit the amount of grain which may fall therethrough. Upper and lower hoods are formed about the holes which are elongated to provide additional strength for the floor plates. The holes are located in the middle of the sidewalls forming the corrugations.