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Solarlux Megaline Bifold Doors
Engineered to push the boundaries of size and performance, the Megaline system offers one of the largest bifold solutions on the market. With panels up to 4.5 metres high, it’s perfect for landmark architecture, public buildings, and high-spec private homes.
Wind load resistance class B4 for structural reliability
Air permeability class 3 for consistent airflow control
Water tightness rated up to class 7A
Thermal transmission coefficient of Uw > 0.9 W/m²K
Durability class 2 — tested for long-term performance
Ideal for oversized panels up to 4.5 m tall or 1.5 m wide
A New Standard for Oversized Bifold Design
Designed for scale, strength, and architectural prestige
The Megaline system redefines what’s possible with aluminium bifold doors. Capable of handling extra-large panels without compromising stability, it offers the flexibility and weather resistance required for large commercial applications and bold residential designs. The system’s bionic TURTLE® thermal break ensures slim sightlines and excellent energy efficiency, while high-performance runners and lock systems support effortless use over time.
System Highlights & Technical Details
Precision-engineered for performance, flexibility, and long-term durability.
Profile System
- Modular aluminium profile system with excellent heat insulation and building depth of 84 mm
- Bottom-running; minimal load support required in case of falls
- Edged profiling
- Sight line of 132.5 mm in the panel butt joint, further structural profiles can be added in the panel butt joint areas depending on structural requirements (e.g. extreme wind loads). This results in a sight line of 129 mm in the panel butt joint
- Single-piece, multi-functional, fibreglass-reinforced polyamide bionic TURTLE® break profile
- Loose shear bond built into thermal break to compensate for thermal loads
- Mitred panels connected by corner connections that are glued and pressed together on the inside to create a sturdy joint
- Controlled drainage
- Built-in running tracks and guide rails
- Separate levels for runners and locks
- Floor track (accessible and suitable for living spaces) available
- Built-in, concealed cable routing
Sealing System
- The seal encompasses two all-round sealing levels with constant gap sizes and even seal pressure between the panels
- Sealing levels not interrupted by fittings
- Sheathed foam seals with optimum sliding properties
- With optional convection chamber interruption seals for improved thermal transmittance
Design Variants
- Panels fold either inwards or outwards, to either left or right
- Floor track designs without rebates in compliance with German standard DIN 18040 on “Accessible construction”
- Floor tracks available as minimal floor tracks without height offset
Fittings
- No protruding running tracks or guide rails
- Fittings with one-hand operation in profiles
- With optional built-in Twin X concealed panel centring mechanism for high wind loads
- System hinges also suitable for heavy panel weights
- System adjustment mechanism built into sub-frame rebate, outside the sealing level
- The specially shaped stainless-steel running track with tapered track roller allows the use of unguided carriages
- Stainless steel ball bearing runner mechanism: stainless steel track rollers and stainless-steel bearing surfaces for quiet running and very long service life
- Easy-running, low-wear carriage fitted with double-row deep-groove ball bearings and built-in anti-prying guard
- Sliding lock or optional lock-in-place panel for controlled ventilation
- High-quality, stainless-steel Solarlux designer handles
- Lock-in-place, one-hand operation thanks to special gears with stroke of 24 mm
- Pass door available with latch-key-activated, multi-point lock and profile cylinder
- Secure hinge pins
- Secure cleaning pin with convenient unlocking mechanism and misuse prevention system to allow cleaning of the outsides of the panels on inwards-opening bi-folding door elements
- Thanks to its defined locking points, this cleaning pin can be used for both paired and unpaired bi-folding doors
- Lock monitoring system with reed contacts and concealed cable routing
- Patented “Comfort Snap” panel catch
- Optional load-transferring plates with centring grooves and sealing cushions for mounting the sub-frame profiles and floor track
- Additional mounting screw covers in frame rebate
Environment & Sustainability
- Sustainable manufacturing
- Certified disposal in accordance with DIN EN ISO 14001:2009
Certifications & Testing
- In-house production control
- Tested in accordance with DIN EN 1090, design class EXC 1 & EXC 2
- Certified in accordance with DIN ISO 9001
What Our Customers Say
We take pride in delivering exceptional glazing solutions and outstanding customer service. Here’s what some of our happy clients have to say about working with Minimal Frame Projects.
Megaline in Commercial and Luxury Spaces
Explore real-world projects featuring Megaline’s impressive scale and engineering
