minimal windows® 4+
High performance for maximum thermal comfort
Our product range embodies the essence of minimalist design by combining simplicity with functionality and comfort. Our minimal windows®4+ is characterized by the integration of triple-glazed premium windows, available as sliding or fixed units, perfect for creating expansive glass façades. These windows not only flood interiors with natural light, but also open up unobstructed views of nature and seamlessly merge indoor and outdoor areas.
Architects can unleash their creativity with our products, as the 4+ enables oversized glass surfaces with heights of up to 6 meters and a weight of up to 1,000 kg per sash. In line with the latest energy-efficient building standards, our solutions are suitable for low-energy and passive houses.
In combination with high-quality insulating glass, our 4+ system enables Uw values of ≥ 0.70 W/m²K and therefore considerable energy savings. In addition, our aluminum frames are designed to withstand strong wind loads while maintaining their slimline elevations of just 26 to 34mm. The minimalist frame profiles integrate seamlessly into floors, ceilings or walls.
At Keller minimal windows, we offer architects, contractors and homeowners a wide range of design options. From mullion-free inner or outer corners to pivot units and all-glass corners, our products offer endless possibilities. For those looking for an even more seamless transition between interior and exterior spaces, our sliding units can disappear into specially designed wall pockets to create unrestricted views and unparalleled aesthetics.
Technical Details | |
|---|---|
Profile facing width | 26 or 34 mm | 1" or 1 5/16" |
Maximum leaf height | 6 m | 236 3/16" (extendable depending on project specifications) |
Thermal transmission coefficient | U-Factor ≥ 0.12 Btu/h·ft2·F | Uw ≥ 0,80 W/m²K |
Maximum leaf area fix | up to 18 m² | 193.75 sqft |
Maximum leaf area sliding | up to 12 m² | 129.167 sqft |
Maximum leaf weight | 1,000 kg | 2204.62 lb |
Overall insulation glass thickness | 40 up to 56 mm | 1 9/16" up to 2 3/16" |
Automated sliding leaf | yes up to 2,400 kg | 5291 lb |
Obstacle-free accessibility | DIN 18040-1, DIN 18040-2 |
Air permeability | A3* |
Rain penetration resistance | 330 Pa* |
Wind load resistance | class C5 according to EN 12210 |
Sound insulation | Rw (C; Ctr) up to 43 dB (1-;-5) |
Burglary protection | up to WK2 (RC2) according to EN 1627 |
Profile facing width
26 or 34 mm | 1" or 1 5/16"
Maximum leaf height
6 m | 236 3/16" (extendable depending on project specifications)
Thermal transmission coefficient
U-Factor ≥ 0.12 Btu/h·ft2·F | Uw ≥ 0,80 W/m²K
Maximum leaf area fix
up to 18 m² | 193.75 sqft
Maximum leaf area sliding
up to 12 m² | 129.167 sqft
Maximum leaf weight
1,000 kg | 2204.62 lb
Overall insulation glass thickness
40 up to 56 mm | 1 9/16" up to 2 3/16"
Automated sliding leaf
yes up to 2,400 kg | 5291 lb
Obstacle-free accessibility
DIN 18040-1, DIN 18040-2
Air permeability
A3*
Rain penetration resistance
330 Pa*
Wind load resistance
class C5 according to EN 12210
Sound insulation
Rw (C; Ctr) up to 43 dB (1-;-5)
Burglary protection
up to WK2 (RC2) according to EN 1627
Flush Installation
The outer frame blends seamlessly into walls, ceilings and floors and provides a flush finish. This design enables a smooth transition between indoor and outdoor areas without steps. Our frame profile, which is installed flush with the floor, guarantees an elegant appearance.
Threshold-Free Transition
The flush-mounted minimal windows® freeway track provides a threshold-free passage to the outside, making it fully accessible. The outer frame is fully integrated into the floor, so the track is level with the floor, eliminating any obstacles to trip over. The freeway system is tested, certified, and maintenance-free.
Security
Our systems are equipped with multi-point locking, providing excellent burglary protection. They are certified according to standards for burglar-resistant components and meet resistance class RC 2.
Pocket Sliding Doors
Specially developed wall pockets allow the minimal windows® sliding elements to disappear completely into the wall. Whether operated automatically or manually, these sliding elements become completely invisible and create spacious and undisturbed living space.
Stainless steel track and rollers
Our stainless steel track is fully integrated into the lower edge of the outer frame and ensures optimum running properties and silent operation of the sliding elements. The track and rollers are perfectly matched and offer stability and effortless operation for sliding elements weighing up to 500 kg (1000 kg 4+, 1500 kg NGS).
Drainage
Our system features a PVC cavity profile installed underneath the lower aluminum frame profile for effective drainage. Alternatively, you can opt for a concealed drainage channel with a stainless steel cover for a minimalist look. Whichever minimal windows® system or combination you choose, we will customize the drainage system to suit your needs.