... certain spacing and cross bar (twisted square steel, square steel, round steel, flat steel, etc.) to cross arranged, and ... can rise to prevent oxidation. Also can use stainless steel. The steel case board with ventilation, lighting, cooling, non- ... 40X6, 40X8, 40X10,….90X6….Pitch of Load bearding flat bars(mm)12.5,15, 20, 30, 30.6 ... 8, 35.3, 40, 60, 80……Pitch of cross bars(mm)38.1, 50, 50.8, 70, 75, ...