This premium polycarbonate backyard greenhouse features a rust-proof aluminum frame and 4mm twin-wall panels that provide superior insulation, UV protection, and optimal light diffusion for year-round plant growth, with adjustable windows and a smooth-sliding door for perfect ...This premium polycarbonate backyard greenhouse features a rust-proof aluminum frame and 4mm twin-wall panels that provide superior insulation, UV protection, and optimal light diffusion for year-round plant growth, with adjustable windows and a smooth-sliding door for perfect climate control.panel material:Polycarbonate, panel thickness:4mm, panel thickness:Double Pane, doors included:Yes, number of doors:1, roof style:Reverse Apex, ventilation included:Yes, ventilation location:Roof Vent, foundation included:No, foundation needed:No, planter included:No, drainage type:Open-bottom, wind rating:30+ Mph, portable:Yes, foldable:No, durability:Weather Resistant; Water Resistant; UV Resistant; Rot Resistant; Rust Resistant; Mold / Mildew Resistant, dimensions:16.2 x 6.2 x 6.6 ft, number of vents and windows:2