Product structure: 1.Structure is similar to all steel raised floor, but no foam cement, the intemal instead of welding stiffener. 2.Ventilation system is composed of circular hole, often with all steel raised floor , used in the lower part of floor ventilation requirements. Advantage: 1.Prevent static validly; fireproof, dustproof; 2.Manual welding, high mechanical strength, strong bearing capacity, good shock-resistance; 3.Except for other function, possess ventilation function; 4.17%~50% ventilation rate, satisfies different environmental requirements on purge.(16%, 20%, 32%, 42%ventilation, and so on)