Keller KELLER minimal windows®4+

Aluminium sliding window


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KELLER minimal windows®4+


Aluminium sliding window



The 4+ version of the frameless sliding window is the highly-insulated triple-glazed variant.‎ It is ideal for the low energy and passive house standard.‎
With modern insulated glass windows it is possible to achieve Uw values of 0.‎ 80 W/m²K.‎
Maximum leaf size up to 12 m² (fixed lights up to 18 m²)
Leaf profile facing width 26 or 34 mm
Maximum leaf height 4,50 m
Maximum leaf weight 1,000 kg
Triple-glazing with insulation glass or special glass
up to 56 mm glass thickness
Energy efficient Uw  ≥ 0.‎ 70 W/m²K
1 to 3-track systems, glass-to-glass corner solutions, solid glass corners and wall inlets for sliding leaves
Threshold and barrier-free
Electric motors with total weight of up to 2,000 kg
Burglar-resistant according to WK2 (RC 2)
Suitable for use in low-energy and passive houses

Further info from manufacturer on KELLER minimal windows®4+
Further details
Low energy standard and slender design as a unit

Design features

Complete integration of the all-round, thermally isolated frame profiles into the floor, wall and ceiling is possible.

Barrier-free floor area, implementable without threshold (DIN 18040-1, DIN 18040-2).

System configurations up to 3-track systems, solutions free of corner posts, all-glass corners and wall integration of the sliding leaf.

Mitred, all-round outer frame provided with 34 mm insulating bars per track with screwed corner cleats. Leaves are structurally glued to the glass all round.

Self-centring, dual-track, stainless steel castors integrated in the leaf and guided by high-alloyed, dual-track, thermally isolated, stainless steel running rails of the lower outer frame profile.

Substructure with PVC hollow-chamber drainage integrated in the system for support of the weight and controlled drainage in a downward direction. Substructure profile with holding groove for EPDM film connection.

Manual 2-point bar lock integrated as standard in the sliding leaf. Locking position(s) freely selectable in the grip, double-vent and coupling profile of the sliding leaf.

Manual trickle vent positioning of 20 and 40 mm of the sliding leaf.

Profile geometries
Facing width of the vertical leaf profiles: 26 mm (34 mm)
Facing width of double-vent profile: 113 mm
Height of the outer frame: 60 mm and 80 mm, concealed installation possible
Depth of the outer frame: 79 / 174 / 269 mm for 1-2-3 tracks
Base point construction under FFL: approx. 90 mm

Performance values
Maximum size per leaf: 12 m² (fixed fields up to 18 m²)
Maximum weight per sliding leaf: 1,000 kg
Maximum overall height: 4.50 m

Maximum glass thickness: 56 mm (triple glazing, Heat Mirror®, special glass types)

Attainable Uw values
Uw ≥ 0.70 W/m²K (depending on the element size, Ug value, Ψ value and installation situation)

2-point locking: WK2 / RC2

Certified stability of the sliding system
Class 4 - maximum class with excellent air leak values according to EN 12207
Class E1050 – driving rain tightness up to 1050 Pa (> 150 km/h) according to EN 12208
Class C5 - under extreme wind loads up to 200 kg/m² (> 200 km/h) in according to EN12210


Electric drives with toothed belts for a leaf weight of up to 1,000 kg and in case of telescopic drive of several leaves up to a total of 2,000 kg (only one motor required), automatic locking, concealed installation.

Electromechanical locking for manually actuated systems, manually by pushbutton and / or remote control.

Integrated opening monitoring.

All electric components can be networked with commercially available home automation systems.

Locking via profile cylinder.

System drainage in drainage channel with stainless steel cover.

Insect screen integrated into the system.

H max: 4,5 m

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