Before galvanizing, it is important that steel articles be fitted with vent holes. Without vent holes, any moisture trapped inside the steel article will become superheated when dipped in molten zinc. This rapid, sudden expansion will lead to an explosion, thereby destroying the article. Therefore, these vent holes allow for steel to be dipped in pre-treatment solutions, ensuring a cleaner surface (and consequently higher-quality galvanizing) as well as safer galvanizing. Holes should at least be 10mm in diameter, and not located on the centre of end plates or connections. We also understand that hole placement can be an aesthetic issue for steel articles. This can be addressed at the design stage. For example, the addition of hollow or open structural sections will  effect the amount, type and location of holes needed for draining  for the article to be safely galvanized. For more information, you can read the guidelines set out by the Galvanizers Association of Australia (GAA):  https://gaa.com.au/venting-draining-guide/