Greenhouse Walk-in Grow House 71352403Features: Protect plants from cold, wind, rain, UV, and wild animals 4mm twin wall polycarbonate sheets and a powder coated aluminum alloy frame The lean to design can get support from existing structures Includes a foundation Sliding door allows easy access to your plants and makes maintenance hassle free Five level adjustable roof vent for fresh air circulation and humidity control Built in gutter system for effective drainage and rainwater