Features: 1.More stronger than tunnel greenhouse, foundation is required 2. Big inside room, suitable for large area. 3. Usually used to grow vegetables such as tomato, cucumber, chili etc, also grow cut flowers 4. All structure by hot galvanized steel pipe, anti-rust for 10-15 years 5. Covered by 3-ply (pe+eva material) poly film (plastic film), anti-uv, anti-drip 130micron/150micron/180micron/200 micron thickness for your choice 6. Wind load: 130km/h, snow load: 0.28kn/m2, max. Rainwater running capacity140mm/h 7. All connectors are jointed by bolt, nut and washer and so on. No welding is required.