steel grating ISO9001:2008 space between(mm):30*50-30*100 wide ... to save the amount of the corresponding supporting structure of the material can be reduced.2, the ... is small, to reduce wind damage.7, the grid structure of anti-product contamination: No plot rain, snow ... CAD computer design is simple: no small beam, simple structure, design simplification; without grating design detailing, you can ...