Venting Holes

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Vent/drainage holes are required in all tubular fabrications that are to be galvanized. Drainage holes are also required in channel, angle and RSJ sections, were the welding together of the sections forms pockets that would trap zinc or air.

The correct placement of holes is an important factor affecting both the quality of the zinc coating and the weight of zinc that is applied to the work.

The table across shows the minimum size of hole required.