Specifications: 1) Cover materials: HPL / PVC 2) Color: gray (optional) 3) Tolerance: a) Width and Length: -0.4mm - 0.0mm b) Panel thickness: +0.30mm c) Level: <0.6mm 4) Sizes: 600 x 600 x 30mm, 600 x 600 x 35mm 5) Weight: approximate 10kg Features: 1) Convenient for wiring installation 2) Surface is treated with static painting with good corrosion resistance 3) High precision for dimensions, good interchangeability 4) All steel structure with high strength and strong anti-impact capability 5) Fireproof, waterproof and dustproof 6) Ventilation 7) Air rate of ventilation panels: 20%, 32%, 42%, 45%