Ventilation grilles are used to cover shafts or rear ventilation of the façade. At the same time, they protect against insect infestation. They usually consist of flat profiles or rods made of hot-dip galvanized steel or stainless steel that cross at right angles and are welded or pressed together .
The bearing bars themselves are connected to each other by the smaller cross bars. To stabilize the grid, steel profiles are usually welded to the edges , which are also hot-dip galvanized.
ventilation grilles, it is important to ensure that enough air can flow through the grille openings. At the same time, if the grid serves as an insect screen, the meshes should be chosen so tightly that it is not possible for insects to penetrate the shaft or the rear ventilation level.
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