Grow More 6 1/2' Extension Kit for GM13 & GM13D Models
Each extension adds 6 1/2' to the length of the Grow More greenhouse. Every extension also includes 2 additional manual roof vents. There is no limit to the number of extensions that can be added to the Grow More greenhouses. Extensions can be installed at the same time as the greenhouse or added at a later date. Grow More extensions can be added to the either end of the greenhouse. If adding them to an existing greenhouse, you will just need to remove the end wall, attach the extension to the existing greenhouse sections, and reattach the end wall to the end of the extension.