The last element in the System+ line is the frame for the panel. It allows you to arrange the entire ventilated space in the same style without having to install a fan. In places where mechanical ventilation is needed you will install a fan, but if this is not necessary, you can fit a ventilation grille with the same appearance, thanks to the base frame and front panel. The base-frame size is 140 x 140 mm, which is the most-popular size for ventilation grilles in Poland.