This extension set adds one more tier to the 52 x 52cm grow rack. Each tier raises the rack by 40.5cm. The set includes a frame for one 52 x 52cm ebb and flow tray plus four uprights. It uses the same 25 x 25 x 1.5mm aluminium and steel-reinforced corners, rated to 70kg per square metre.
Keep adding tiers to suit your ceiling height and grow far more in the same floor space. The frame supports double as mounting points for lights on the tier below. That keeps lamps close to the canopy of your microgreens or salad leaves. The ebb and flow tray is not included.