... ventilation systemCooling systemShading SystemIrrigation System1. Features:Roof Vent, which is fixed, can be good ventilation on the top, especially ... 2. Structure1) Greenhouse built by hot galvanized steel pipe, is composed of column, arch, purline, lattice bar, gutter and ... pipe are offered to collect rainwater3. Greenhouse Covering The greenhouse is covered by 3-ply (PE+EVA Material) poly film ...