Get a great start on the growing season! These cold frames are the finest in European design. Weather resistant with 8mm polycarbonate double skin panes and a sturdy weather-resistant aluminum frame. Three windows, two adjustable wind-proof ventilators per window. Optional add-on two ventilator unit (JBBA) available to let this frame grow with your garden. UV-resistant, 10 year guarantee against yellowing of panes. Dimensions: 59" x 31.5" x 19.68". Now includes one automatic ventilator.