Effective protection Protects the fans from foreign objects and prevents cable damage. The fan grille is secured in front of the fan using the included screws, protecting against hanging cables and protecting the user from injury. Permeable for airflow Fan grilles have little impact on performance - less than 1% impact on airflow. Available in different sizes Our fan grille is available in four different sizes: 40 mm, 80 mm, 92 mm, 120 mm and 140 mm.