The RC3 burglar-resistant ventilation grille is manufactured from aluminium profiles AlMgSi 0.5 according to EN 12020-2. It is supplied as standard with stainless steel mesh 304 with a mesh size of 2.3 × 2.3 mm. The finish is available in natural anodised (20 microns) or powder-coated in any RAL colour with a coating thickness between 60 and 80 microns.