1.All the steel structures are galvanized & bake-painted. 2.Workers can install 1 unit in only 3 minutes. 3.When is folded,the height is only 420 mm.40 HQ can load 10 units. It can save transportation, installation and storage cost. 4.Fire proof,water proof,corrosion-resistant,sound-insulation. 5.Environment protection :no construction waste, materials can be recycled.