Fixed Roof Vent Greenhouse - Simple structure, easy assembly and low cost. Its supporting poles are free from being cast with concrete foundation which in turn reduces the costs of the investment and avoids the damage to the farmland. - Spacious space inside which help to gain good light transmission. -Fixed roof vent,all 4 side walls are covered by insect net instead of film to have better ventilation. -Roof covering is3 layers extruding film, the outer layer has the function of dustproof and the inner layer anti-dripping. -High quality steel structure and long service life -Prefabricated structure. All the parts can be easily assembled on the spot with joining parts and bolts and nuts, without any welding points to damage the zinc coating on the material, which guarantee the optimal performance of anti-corrosion. - Firm in its structures, efficient in energy-saving and friendly to the environment. The appearance of the greenhouse is also quite pleasing to your eyes.