PREVENTIVE: Ventilation grilles provide protection against rapidly rotating fan blades and prevent damage to the cable DOES NOT AFFECT THE AIR: Ventilation grids hardly affect airflow, this means that there is less than 1% impact on performance AVAILABLE IN DIFFERENT SIZES: Our ventilation grids are available in 4 sizes: to fit your 80mm, 92mm, 120mm or 140mm fan perfectly GERMAN PRODUCT: Our German engineers constantly improve the performance of our fans. With this range of accessories, we continue our search for excellence TECHNICAL DETAILS: Grill size for fan 80 mm: 71.5 mm * 71.5 mm (hook grip). This product is made of nickel-plated steel