... , ventilated, easy to clean and attractive appearance.2) steel grating are widely used by various plants such as: ... foodstuff factory, transportation, municipal, administration, parking lot etc.3) steel grating may be applied to platform, floor, walkway, stair treads ... ceiling, ventilates and light through facility, etc.4) category: 1.common steel flat grates,2.I shape steel flat grates, 3. serrated ...