The combination of ventilated floor is similar to that of the antistatic all-steel floor in structure, but its enclosed space is of no foaming filler. There are punched vents on the upper and lower steel plates of the floor as well as well on the veneer. The ventilated floor used with the all-steel access floor is applicable to the sties with ventilation requirements for the underneath of floor. The ventilation rate of floor is 20%-45%