The blades are fixed to the frames with self-tapping screws from the back f frames and the frames are reinforced with concealed aluminium angle plates so that no fixings are visible on the face.

• 从窗架后面通过自攻螺钉将叶片固定在窗架上，窗架采用隐藏式铝材角板加强，因此从表面看不到固定件。