Here is the spot on my old journal that explains it. Mine has a lower that I can tie-wrap to the fabric pots, then the screen assembly slides into a thin wall upright with sheet metal screws to hold it…lt’s adjustable vertically for fine tuning and has 4 X 6" openings or ‘cells’ to use to populate the screen. I can pick this whole thing up (and do) when weather is good to take advantage of free sunlight.