Ventilation Grill with optional insect screen

A ventilation grille with the option of installing an insect screen in between. The component consists of two parts 1) the actual ventilation grille or frame with the dimensions 120x120mm (the necessary cut-out is 105mm) and 2) an optional frame to install an insect screen if required. To do this, cut an insect screen with the dimensions 100x100mm and place it on the inside of the ventilation grille. The frame is then simply placed on the grille to fix the insect screen in place (the frame can a