The concept was born of the combination of two materials often found near this location: concrete tube pipe sections and metal sheet.
概念衍生于这个区域非常常见的两种材料的结合：混凝土管道部分和金属板。
Each damper is a short sheet metal vent pipe fitted with a circular damper plate within the vent pipe, and attached to a square anchor plate.
每一个节气阀都是由一个短的金属片的排气管再安装上圆形的风挡，然后粘上真方形的固定板制成的。
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