One of the factors that creates problem in windows is still ventilation. Now this problem is solved. To preserve the netural ventilation in the room different ventilation mechanisms can be installed in the window frame. For example, cut hole in the upper part of the frame that will supply air from the street. From the outside install the screen with the array, from inside install supply unit itself.
Easier and cheaper to install it directly during production by ordering ventilation along with window. It is easy to install it in already installed windows.
Mechanically adjustable ventilation system Biobe (use only in wood and wood aluminium windows)