"Perfectly sized for the experienced grower, this ShelterLogic GrowIT Heavy-Duty Round Greenhouses with roll-up side vents is easy to build. Designed to stand up to the elements with DuPont premium powder-coated 1 5/8in. steel frame and waterproof polyethylene fabric cover. Adjustable ventilation makes this greenhouse perfect for plants for everything from starting seedlings through extending growing seasons. Center Height in. 100, Ventilation Adjustable on all four sides, Outer Material Polyethylene, Frame Spacing in. 48, Frame Thickness in. 1 5/8, Side Wall Height in. 72, Dimensions L x W ft. 20 x 12, Glazing Waterproof, UV-treated cover, Width in. 144, Shelves qty. 0, Color Gray frame, translucent cover, Length in. 240, Frame Type Steel, Style Round. Round frame design DuPont premium powder-coated 1 5/8in. steel frame High-density polyethylene fabric cover for optimal plant growth Patent-pending ShelterLock 3X stabilizers ensure rock-solid stability Roll-up side panels for airflow Double zippered front and rear doors with screened vents Easy slide cross rail system locks cover down and squares up frame 30in. auger anchors included Comes with a hardware kit and step-by-step instructions for an easy build that's ready right out of the box"