外部材质使用高级烤漆。
外部的材质色彩是本色的，包括磨面的石工单位、混凝土、锌和合成铝。
The material palette of the exterior is straightforward, comprising ground-face masonry units, concrete, zinc and composite aluminum.
气流调节阀：气流调节扭与挡风板均为高密度PP材质，用304不锈钢方棒连接，手动调节外部阀门旋钮，控制气流量。
Damper: both gas flow regulating button and wind board are high grade PP material, connected with 304 stainless steel bar, manually adjust the outside valve knob, control air flow.
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