Slide and Turn-Systems

Slide and turn systems SF25 / SF30 / SF35 – Loggia and balcony glazing that can be fully opened

A loggia that's protected from the rain and transforms into an airy oasis in the sun. A balcony that seamlessly opens into the living space on summer evenings and becomes wind-free in autumn. This is precisely what the SUNFLEX slide and turnsystems SF25, SF30, and SF35 make possible: individually movable glass panels that can be rotated inwards or outwards and slid to the side – for an exceptionally wide and space-saving opening for balconies, loggias, or conservatories. With system widths of up to 26 meters and corner solutions between 90° and 180°, these sliding-folding systems are among the most flexible glazing solutions in the SUNFLEX range.

Configurator & Process

Use the SUNFLEX configurator to create your project and individually configure the width, height, number of panels, and glass selection. In the final step, you choose a SUNFLEX specialist partner near you who will professionally handle the measuring, planning, and installation.

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For which projects are the SUNFLEX slide and turn systems ideal?

Loggia glazing

Loggias are often the architectural centerpiece of a facade, but are rarely used in wind and rain. The SUNFLEX slide and turn system transforms the loggia into an inviting, weather-protected living area without obstructing the view. In good weather, the glass panels can be slid to the side, allowing the loggia to open almost completely and feel truly refreshed. The system's exceptionally compact design ensures that even narrow loggias can achieve their maximum possible opening width. The minimalist, frameless design allows for an unobstructed view even when closed.

Balcony glazing

A glazed balcony that can be fully opened in summer is a true space-saving concept. The SUNFLEX sliding-folding systems can be installed around corners (angles between 90° and 180°), making them ideal for balconies with an L-shaped layout or corner balconies. The frameless design of the SF25 and SF30 ensures that the balcony offers a light-filled feeling even when closed, and allows for breathtaking panoramic views.

Terrace roof and summer garden

The SF30 is particularly effective as side glazing for a SUNFLEX terrace roof: all three open sides of a terrace roof can be stylishly glazed with the slide and turn system. Under optimal conditions, 26 panels (13 on the left and 13 on the right) are possible. Corner installations at angles between 90° and 180° are also easily achievable, and the stainless steel tracks can be installed flush with the floor. This creates a spacious summer garden that can be fully opened, blurring the lines between indoors and outdoors.

SF25

All-glass system, hanging

SF25

: All-glass system, suspended (frameless look)
: 20,800 mm | Min. system width: 500 mm
: 2,800 mm | Min. system height: 600 mm
: up to 13 left + 13 right
: Single track
: 8 mm, 10 mm and 12 mm tempered safety glass (ESG-H)
: Possible with recessed floor track
: No (for seasonally used areas)
: Adjustable via angles and arches between 90° and 180°
: 5 mm

SF30

All-glass system, standing

SF30

: All-glass system, vertical (frameless look, maximum system width)
: 26,000 mm | Min. system width: 650 mm
: 3,000 mm | Min. system height: 600 mm
: up to 13 left + 13 right
: Single track
: 10 mm and 12 mm tempered safety glass (ESG-H)
: Possible with recessed floor track
: No (for seasonally used areas)
: Adjustable via angles and arches between 90° and 180°
: 10 mm

SF35

Aluminum system with insulating glass, suspended

SF35

: Aluminum system with insulated glazing, suspended
: 20,800 mm | Min. system width: 500 mm
: 2,800 mm | Min. system height: 600 mm
: up to 13 left + 13 right
: single track
: 8-10 mm tempered safety glass or 18 mm / 20 mm insulated glazing
: Possible with recessed floor track
: No, but insulated glazing possible
: Adjustable via angles and arches between 90° and 180°
: 5 mmmm

Product features & technical data

Product type

Max. system width

Max. system height

Number of sashes

Floor tracks

Glass thickness

Accessibility

Thermal insulation

Corners

Tolerance compensation

SF25

All-glass system, hanging

SF25

: All-glass system, suspended (frameless look)
: 20,800 mm | Min. system width: 500 mm
: 2,800 mm | Min. system height: 600 mm
: up to 13 left + 13 right
: Single track
: 8 mm, 10 mm and 12 mm tempered safety glass (ESG-H)
: Possible with recessed floor track
: No (for seasonally used areas)
: Adjustable via angles and arches between 90° and 180°
: 5 mm

SF30

All-glass system, standing

SF30

: All-glass system, vertical (frameless look, maximum system width)
: 26,000 mm | Min. system width: 650 mm
: 3,000 mm | Min. system height: 600 mm
: up to 13 left + 13 right
: Single track
: 10 mm and 12 mm tempered safety glass (ESG-H)
: Possible with recessed floor track
: No (for seasonally used areas)
: Adjustable via angles and arches between 90° and 180°
: 10 mm

SF35

Aluminum system with insulating glass, suspended

SF35

: Aluminum system with insulated glazing, suspended
: 20,800 mm | Min. system width: 500 mm
: 2,800 mm | Min. system height: 600 mm
: up to 13 left + 13 right
: single track
: 8-10 mm tempered safety glass or 18 mm / 20 mm insulated glazing
: Possible with recessed floor track
: No, but insulated glazing possible
: Adjustable via angles and arches between 90° and 180°
: 5 mmmm

SF25

All-glass system, hanging

SF25

: All-glass system, suspended (frameless look)
: 20,800 mm | Min. system width: 500 mm
: 2,800 mm | Min. system height: 600 mm
: up to 13 left + 13 right
: Single track
: 8 mm, 10 mm and 12 mm tempered safety glass (ESG-H)
: Possible with recessed floor track
: No (for seasonally used areas)
: Adjustable via angles and arches between 90° and 180°
: 5 mm

SF30

All-glass system, standing

SF30

: All-glass system, vertical (frameless look, maximum system width)
: 26,000 mm | Min. system width: 650 mm
: 3,000 mm | Min. system height: 600 mm
: up to 13 left + 13 right
: Single track
: 10 mm and 12 mm tempered safety glass (ESG-H)
: Possible with recessed floor track
: No (for seasonally used areas)
: Adjustable via angles and arches between 90° and 180°
: 10 mm

SF35

Aluminum system with insulating glass, suspended

SF35

: Aluminum system with insulated glazing, suspended
: 20,800 mm | Min. system width: 500 mm
: 2,800 mm | Min. system height: 600 mm
: up to 13 left + 13 right
: single track
: 8-10 mm tempered safety glass or 18 mm / 20 mm insulated glazing
: Possible with recessed floor track
: No, but insulated glazing possible
: Adjustable via angles and arches between 90° and 180°
: 5 mmmm

Technical features of the sliding-rotating systems SF25, SF30 & SF35

SF25 – All-glass system, hanging

Product type: All-glass system, suspended (frameless look)
Max. system width: 20,800 mm | Min. system width: 500 mm
Max. system height: 2,800 mm | Min. system height: 600 mm
Number of sashes: up to 13 left + 13 right
Floor tracks: Single track
Glass thicknesses: 8 mm, 10 mm and 12 mm tempered safety glass (ESG-H)
Accessibility: Possible with recessed floor track
Thermal insulation: No (for seasonally used areas)
Corners: Adjustable via angles and arches between 90° and 180°
Tolerance compensation: 5 mm

SF30 – All-glass system, standing

Product type: All-glass system, vertical (frameless look, maximum system width)
Max. system width: 26,000 mm | Min. system width: 650 mm
Max. system height: 3,000 mm | Min. system height: 600 mm
Number of sashes: up to 13 left + 13 right
Floor tracks: Single track
Glass thicknesses: 10 mm and 12 mm tempered safety glass (ESG-H)
Accessibility: Possible with recessed floor track
Thermal insulation: No (for seasonally used areas)
Corners: Adjustable via angles and arches between 90° and 180°
Tolerance compensation: 10 mm

SF35 – Aluminum system with insulating glass, suspended

Product type: Aluminum system with insulated glazing, suspended
Max. system width: 20,800 mm | Min. system width: 500 mm
Max. system height: 2,800 mm | Min. system height: 600 mm
Number of sashes: up to 13 left + 13 right
Floor tracks: single track
Glass thicknesses: 8-10 mm tempered safety glass or 18 mm / 20 mm insulated glazing
Accessibility: Possible with recessed floor track
Thermal insulation: No, but insulated glazing possible
Corners: Adjustable via angles and arches between 90° and 180°
Tolerance compensation: 5 mmmm

What exactly are the SUNFLEX sliding-rotating systems?

SF25, SF30, and SF35 are glazing systems for loggias, balconies, and the side glazing of terrace roofs. The principle is the same for all three systems: The operating panel is unlocked with a handle and pivoted either inwards or outwards. All other glass panels can then be slid to the side on the single-track bottom rail and parked as a compact unit. These sliding-folding systems allow for complete opening of the glazing, offering an unobstructed panoramic view. The panel configuration and sliding direction are freely selectable.

All three systems share the same technical foundation: a completely rustproof carriage system with needle bearings and polyamide rollers, a double brush seal at the top and bottom of each glass panel, a double locking mechanism, and the option of recessing or surface mounting the bottom rail. Individual glass elements can be replaced at any time. All systems are available as either a frameless all-glass construction or a framed aluminum construction and can be installed around corners or curves between 90° and 180°.

The systems differ in their guidance system, installation height, and glass construction: The SF25 is suspended and offers a virtually invisible, frameless, all-glass appearance up to a height of 2.8 meters. The SF30 is vertically guided, reaches a height of up to 3.0 meters, and enables particularly impressive panoramic fronts of up to 26 meters. The SF35 complements the suspended construction with insulated glazing for enhanced sound insulation and an optional gap seal for improved airtightness.

What are SUNFLEX slide and turn systems suitable for and what are they not suitable for?

Suitable for:

Loggia glazing
Balcony glazing
Side glazing of patio roofs
Projects with corner geometries and arched shapes (90° to 180°)
Systems designed to open fully

Not suitable for:

Projects requiring high thermal insulation (e.g., heated conservatories). The SUNFLEX SF60 / SF80 sliding window systems are recommended here.

What distinguishes the slide and turn systems from other SUNFLEX systems?

The defining feature of slide and turn systems is the combination of rotation and sliding: Each panel rotates individually outwards and can then be slid to the side. This allows the entire front to be almost completely opened. With the SF20/SF22/SF42 sliding systems, the glass panels are moved linearly without a rotation mechanism. A portion of the opening width always remains occupied by the sashes' parked position. With the slide and turn systems, the framed glass panels are folded like an accordion. The sliding window systems, with models SF40/SF60/SF80, offer various levels of thermal insulation as well as RC2 burglar resistance and are the right choice when thermal separation and security are paramount.

What problems do SUNFLEX slide and turn systems solve??

Loggias and balconies often go unused in wind and rain because they are too cold, too noisy, and too exposed. Standard systems don't offer the desired solution, as their wide frames obstruct the view or prevent them from opening fully. Glazing with SUNFLEX sliding-folding systems solves these problems:

Weather protection without restrictions: When closed, the glass reliably protects against wind, rain, and noise. At the same time, the frameless design offers an unobstructed view. So you can enjoy your coffee even in the rain without getting wet.
More usable space: Loggias and balconies are transformed into fully-fledged living spaces that can be furnished without worrying about water or wind damage. Your favorite furniture can now remain outdoors in all weather.
Simple cleaning: Because the glass panels can be rotated individually, cleaning is particularly easy. A drip tray reliably drains away cleaning water and condensation.
Maximum opening width: When opened, the system disappears sideways as a slim package, completely clearing the passageway. The stainless steel tracks can be installed flush with the floor, blurring the boundary between indoors and outdoors.
Suitable for any floor plan: Whether rectangular loggia, corner balcony, L-shaped floor plan or polygonal arch shape, the sliding-rotating systems can be configured via angles between 90° and 180° as well as for curved facades.
Noticeably more peace and quiet: With airborne sound insulation up to Rw = 34 dB (SF25) or Rw = 30 dB (SF35), the exposed outdoor area becomes a quiet, protected living space.

Frequently asked questions about SUNFLEX slide and turn systems

Loggia glazing: SF25, SF30 or SF35? Which model suits my project?

SF25 and SF30 are both frameless all-glass systems; the difference lies in the guidance system: SF25 is suspended and designed for heights up to 2.8 m, while SF30 is vertically guided, reaching heights of up to 3.0 m and offering the maximum system width of 26 m. The SF35 complements the suspended version with insulated glazing and is therefore suitable for increased sound insulation requirements or when heavy insulated glass is to be used. Your SUNFLEX specialist partner will recommend the appropriate system based on the installation situation, height, glass requirements, and your individual preferences.

Can the sliding-rotating systems be guided around corners?

Yes, all three systems can be installed around corners between 90° and 180°. This is particularly practical for L-shaped loggias, corner balconies, or patio roofs that require glazing on multiple sides. The sashes can be individually positioned and opened, as each panel can be moved independently.

Can the SUNFLEX sliding-rotating systems be locked?

Yes, all three systems can be equipped with a lockable locking profile and profile cylinder. The SF25 and SF30 also offer a choice between a rotary knob, lever handle set, and various flat handle options. All systems feature double locking as standard. For projects with increased security requirements—such as ground-level loggias or terrace access—the profile cylinder option is recommended, which your SUNFLEX specialist partner can incorporate into the configuration.

Are the sliding-folding systems thermally insulated?

The frame profiles of the SF25, SF30, and SF35 are not thermally insulated. The SF35 can be fitted with insulating glazing, which improves the thermal performance of the glass. However, this system is not designed for heated living spaces as a replacement for an exterior wall. For fully insulated patio doors or conservatories, the SUNFLEX sliding window systems SF60 or SF80 are recommended.

How much space do the wings require when open?

This is one of the biggest advantages of slide and turn systems: The panels are rotated outwards or inwards and then slid together on a single track. This means that the space required when open is very small. The entire glass front can be almost completely exposed, and the usable opening is significantly wider than with traditional sliding doors.

Is barrier-free installation possible?

With models SF25, SF30, and SF35, the floor track can be recessed for barrier-free installation, eliminating tripping hazards. Barrier-free installation according to DIN 18024 should be discussed with your SUNFLEX specialist partner early on, as this depends on the installation situation and the floor construction.

How much does glazing with a sliding-folding system cost?

A fixed price cannot be quoted, as it depends on the system width, height, number of panels, glass choice, and individual installation requirements. Use the SUNFLEX configurator to create your desired configuration and receive a specific, project-tailored quote from your specialist partner.

Where can I find a supplier of SUNFLEX sliding-folding systems near me?

SUNFLEX distributes its systems through qualified specialist partners – metal and glass construction companies that handle consultation, measurement, and installation from a single source. You can quickly find a certified partner in your region using the SUNFLEX specialist partner search.

Quality, testing & international experience

For decades, SUNFLEX has been developing and manufacturing sliding, folding, and glazing systems – with partners and locations on every continent. SUNFLEX products are CE marked and are tested for air permeability, resistance to driving rain, and wind load at independent testing institutes. Global project experience – from loggia glazing in apartment buildings to glass facades in commercial construction – ensures reliable systems and a high degree of planning certainty for both private homeowners and specialist companies.