Exaco RIGA XL 283 Square Foot Greenhouse EXCELLENT R-VALUE: 2.5 Heavy duty construction; thick aluminum profiles, reinforced base and 16 mm Twin wall polycarbonate glazing Walking area 74" high, 10' wide and 19.8" long Includes 4 large roof windows, 4 large dutch barn style doors and 4 automatic roof window openers INSTALLATION AVAILABLE: click on video link next to main picture or call: 888-338-6719