ShelterLogic AccelaFrame HD Greenhouse, 12 x 20 x 9' AccelaFrame Quick Frame Assembly System - Cuts frame build time from hours to as little as 30 minutes Increased Building Strength - Overall 2 times stronger than comparable shelters Less Chance of Assembly Errors - Joints are pre-assembled in the box and cross rails feature simple snap-in connections Less Intimidating Assembly - Drastic reduction in loose parts in the box which decreases time to assemble Size: 12x20x9 ft