This small green house is a great way to protect your plants from frost and other harmful weather. The crystal-clear polycarbonate SnapGlas roof panels are held in place by an easy-to-assemble frame, which in turn is held down by a number of ground spikes. Dimensions L x W ft. 3ft. 4in. x 1ft. 8in., Outer Material Polycarbonate, Length in. 41, Width in. 22, Style Single cold frame, Ventilation Hinged door, Color Clear, Frame Type Corrosion-resistant aluminum, rigid polypropylene frame, Center Height in. 18.