Greenhouse Black and White Plastic Sheet Blackout Greenhouse Film. Durable Steel Structure: Hot dip galvanized steel frame ensures over 10 years of service with excellent anti-corrosion. Multi-Functional Film: Extruding film offers dustproof, anti-fog, anti-dripping, anti-aging, and UV block properties. Easy Assembly Design: Prefabricated parts assemble on-site with bolts without welding, preserving zinc coating integrity. Customizable Dimensions: Length, span width, side wall, and apex height can be customized to specific requirements. Optional Ventilation: Features optional side natural ventilation with manual control and available insect nets.