Mobile racking Step 01 Fill in the measurements you want in the appropriate boxes, and/or choose from the racking data-base. The figures below explains what is what. C = Depth across frame (normally 1100 mm or 1000 mm for a 1200 mm deep pallet) D = Depth of pallet H = Height to top beam 1S = 1 pallet per beam with the short side of the pallet facing the aisle. 2S = 2 pallets per beam. 3S = 3 pallets per beam. F = Upright width. 1L = 1 pallet per beam with the long side of the pallet facing the aisle. 2L = 2 pallets per beam.