RENSON 411 LOUVRES Decorative aluminium ventilation grille

411 Louvres is a decorative ventilation grill made of aluminum available in different sizes.‎ ‘411’ is the name of the party animal blowing out 50 candles this year.‎ Renson revolutionised the field of natural ventilation in the 1970s with this louvre, made up of L.‎033.‎01 blades.‎ They were the first ventilation louvres in which the blades were clipped in rather than welded or affixed with rivets.‎ At that time, it was a revolutionary step forward in the field of louvre production.‎ It’s the L.‎033 blades (also used in the 414 and 431 louvres and bladed walls which followed later) that will be upgraded.‎ These louvres can now boast a free airflow of 50% rather than 45% and an air permeability upgrade from class 4 to class 3.‎ This has no impact on the method of installation and the other components of these louvres, but it does create a ventilation louvre that can meet the requirements of the year 2020 even better.‎ Technical features: - Made from aluminium sections: AlMgSi 0.‎5 (according to EN 12020-2) - Stainless steel 304 insect screen (2.‎3 x 2.‎3 mm) - Finishing: anodized in satin colour (20 micron) or powder-coated in any RAL or Syntha Pulvin colour (40 micron)