The heavy-duty built-in grille with high airflow capacity is manufactured from aluminium profiles AlMgSi 0.5 according to EN 12020-2. It is supplied as standard with stainless steel insect mesh 304 with a mesh size of 2.3 × 2.3 mm, while stainless steel wire mesh 304 with a mesh size of 6 × 6 mm is available on request. The finish can be supplied in natural or bronze anodised (20 microns) or powder-coated in any RAL, Sikkens, NCS or Interpon colour with a coating thickness between 60 and 80 microns.