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Drainage
When designing or producing structural hollow structures, remember to provide for each separate element appropriate drainage. The technological holes must be located at the ends of the pipes on opposite sides diagonally.

Direction of holes
Place the holes as close to corners as possible! As well proper direction of holes should be considered. It heps the galvanizer if the holes all drain in the same direction. This avoids manipulating and turning of the article with risk of damage or trapping zinc in pockets.