Our product developers have incorporated the proven and reliable technology of our Internorm windows into this sleek new window. It is characterised by the best thermal insulation and sound reduction values, as well as all round bonding of the glass pane with the window sash. KF 310 is available in a large selection of colours, handles and glazing, as well as a balcony and patio door and now also as Juliette balcony. The square-edged exterior design of the frame and sash matches the design style home pure.