Top mounted shutters that can also be called roller shutters are installed only at the construction stage of the facility or during the replacement of window woodwork in the already existing facilities.
The box of roller blinds in this case is applied on the frame of windows or doors. Guide rails are screwed to the external part of the window frame, and only later is the whole set installed in the window recess.
The box of the shutters is eventually invisible, and shutters seem to be parts of the windows.
The great advantage of our roller shutters is the fact that in the end it is invisible and the roller shutter seems to be part of the window.