The lights are generally set as fixed fans for ventilation or lighting windows (either in the upper part or in the lower part can not be opened). The fixed fans are called lights in the upper part and Open fans in the lower part openable field.. The upper window of the door, whether fixed or not, is called Bright.
The upper part of the door or window can be independently switched with glass casement. Mandarin is also called Shaking head window, and Cantonese is called Liangzi. As shown in the following figure:
The lighting function is mainly lighting, and the ventilation function is the second.
