The SF22: What's Really Happening Beneath the Glass?

Why Use a Bottom-Running System?

Glass is heavy—particularly when several large panels are moving across one patio opening. With the SF22, the bottom track carries the weight of the glass, while the top track guides and stabilises each panel. Because the system does not rely on the overhead structure to support the weight of the panels, it offers greater installation flexibility for patios, verandas and entertainment areas where roof structures can vary considerably.

The track does more than carry the weight. It keeps each panel aligned and controls its movement as it slides across the opening. Because the panels remain securely guided within the track, they cannot swing freely in strong winds like conventional aluminium stacking doors can when left open or accidently unlatched. The panels remain controlled within the tracks, even when that calm afternoon breeze suddenly turns into the sort of coastal gale that sends everyone running outside to rescue the cushions.

When opened, the panels remain on the track and slide neatly behind one another. They do not turn, pivot or stack to the side. The SF22 uses exactly the same bottom-hung sliding system as the SF20; the key difference is the design. The SF20 offers uninterrupted frameless glass, while the SF22 features integrated Simulated Divided Lites for a more defined, framed architectural finish.

The bottom track can also be recessed into the floor, creating a flush transition between inside and out. With no raised threshold to step over, there is less chance of tripping—This is particularly useful when you're carrying braai platters and drinks through to the patio while trying not to miss the start of the rugby game.

What Does the Bottom Track Look Like?

The track is a slim aluminium profile running along the base of the opening. It creates a clean, straight line across the patio and contains the tracks needed to carry and guide the individual panels.

Yes, it is visible. No, it does not look like a railway line crossing your entertainment area. The track can be fitted above the finished floor, or it can be recessed so the track sits flush with the surrounding floor for a cleaner, more seamless finish.

The profile is designed to sit neatly beneath the system without competing with the architecture. While the glass and SDL framing get most of the attention, the bottom and top tracks quietly carry the weight, and guide the panels and keeps everything moving in the right direction.

One Panel Leads. The Others Get the Message.

The SF22 can have up to six follower panels running along the track.

When the leading panel is opened, SUNFLEX's intelligent follower technology engages the next panel. That panel collects the one behind it, and so the sequence continues. In other words, you don't need to walk along the entire patio opening and move six separate panels one by one. Move the leading panel and the others follow neatly behind it.

You can open only the section you need for everyday access or continue sliding the panels to create a much larger opening.

The system is operated using a small, modern handle that sits neatly against its slimline aluminium profile. It is easy to grip without interrupting the clean lines of the design.

The SF22 uses the same bottom-running sliding system as the SF20. The main difference is what you see: the SF20 offers uninterrupted frameless glass, while the SF22 features integrated Simulated Divided Lites for a more defined, framed appearance.

Same clever track system. Very different personality.

Good Looks, Backed by Better Engineering

The SF22's Simulated Divided Lites give the system its recognisable framed character. The SDL grid is integrated into the design, with detailing applied to both sides of the glass to create the appearance of individual framed panes.

It suits contemporary coastal homes, modern farmhouses and industrial-inspired spaces particularly well—But the SF22 is not simply the SF20 dressed up in a smart grid pattern.

It is a dedicated sliding system built around bottom-running engineering, intelligent follower technology and panels that remain controlled between two tracks. The framed design is what catches your eye. The way the system moves is what you appreciate every day.

And if you still want to talk tracks, panels or exactly what will work on your patio, speak to the SUNFLEX team. We genuinely enjoy these conversations—probably more than most people would consider normal.