louvres

1. 遮光栅格：louvers 遮光栅格 | louvres 遮光栅格 | low alkali cement 低碱水泥

2. 百叶窗：接地螺栓 earthing bolt | 百叶窗 louvres | 隔板 closure, partition

3. 熏房顶的通风调筛器：lotus seed sugar preserved 糖莲芯 | louvres 熏房顶的通风调筛器 | low acid food 弱酸性食品[PH5.0~7.0]