Cassette blinds with flat side guides are nothing else but a roll of fabric wrapped around a roller, protected by a cassette at the top and flat guides on the sides.
Both the cassette and guides are attached to the glazing beads. The fabric slides along the window pane between the glazing beads.
Thanks to the cassette and side guides, Helios blinds become an integral part of the window, holding the fabric even when the window is slightly open.
The aesthetic self-locking mechanism with a chain will allow you to stop the fabric at any height.
This type of blinds is installed on each window pane, which means that every lite requires a separate set of blinds.
For example, a balcony door with a mullion (mid-rail) requires two separate sets of blinds for its upper and lower section.
If you are looking for balcony door blinds that will cover the entire door and do not need two separate sets of blinds for the upper and lower pane, you should pick cassette blinds with U-shaped side guides.