This barn-shaped design provides more growing space than a traditional 'A' Frame greenhouse. Designed for the enthusiast grower, the Rion family of greenhouses offers extra space for both grower and plants. Rion system modularity supports the greenhouse owner's changing needs. Comes with lockable hinged doors. The fully insulated double walls, with total thickness of 4mm, have UV coated polycarbonate glazing for better sun protection, light diffusion, heat insulation, strength, and safety. Its R Factor (ability to retain heat) is 1.46. The greenhouse is 12 panels long (including 2 doors) and is expandable so you can add a section now or later.