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The grommet panel must be a minimum of 70 inches wide, between the side hem seams, to provide just slightly more than 1.5 times fullness on the 40-inch space.
Standard panels sizes are 3ft (90cm) 4ft (120cm) 5ft (1.5m) and 6ft (1.83m). Close board Panels Close board panels are panels made with vertical featheredge boards. Theses are much stronger than panels and tend to last a lot longer. Again you can use either concrete or wooden posts and gravel boards as required.ravel boards are usually 1.83m long. In wood they are 15cm high and this is generally the only size available although they can be stacked on top of each other. In concrete they come in two sizes, both are 1.83m in length but come in 15cm and 30cm height. You should only fit concrete gravel boards to concrete posts.