... Vent, which is fixed, can be good ventilation on the top, especially suitable for hot areas, like Africa, Middle-Ease, ... washer and so on. No welding is required Xiamen Longyoung Agricultural Technology Co., Ltd Is a professional greenhouse maker and greenhouse kits ... also can contact us by the ways as bellow: Xiamen Longyoung Agricultural Technology Co., Ltd. Add: No.81, Xindian Town, Xiang\'an ...