SlimLine 38 – Ultra-Slim Aluminium Door System with Timeless Steel-Look Elegance
The SlimLine 38 (SL 38) aluminium door system by Reynaers Aluminium is where timeless design meets contemporary performance. Inspired by classic steel-framed doors, this system is engineered to deliver minimalistic aesthetics without compromising on insulation, durability, or security. Whether you’re restoring a heritage property or building a sleek, modern residence, SlimLine 38 is the ideal solution for creating refined, light-filled entrances with slim sightlines.
One of the biggest advantages of SlimLine 38 is its ability to replicate the elegant appearance of steel doors while offering the superior performance of modern thermally insulated aluminium. This makes it perfect not only for new constructions but also for renovation projects where historical character must be preserved.

Key Features of SlimLine 38
SlimLine 38 stands out for its elegant proportions and technical capabilities:
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Steel-look Minimalist Design
With visible profile widths starting from just 38.5 mm, SlimLine 38 delivers the iconic aesthetic of traditional steel doors in a lightweight, efficient aluminium form. -
Advanced Thermal Performance
Achieving Uf values as low as 1.8 W/m²K, it meets today’s energy-efficiency requirements while maintaining slim geometry. -
Excellent Acoustic Insulation
Provides up to Rw(C;Ctr) = 45(-1;-5) dB, helping to block unwanted noise in urban and commercial environments. -
Security Certified
Tested to RC2 burglary resistance and compliant with PAS 24, offering peace of mind in both residential and commercial buildings. -
Triple Design Variants:
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Classic: Inclined lines for a traditional touch
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Ferro: Industrial-inspired profiles with sharp angles
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Cubic: Modern stepped profiles for a geometric look
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Each variant ensures the system can be matched precisely to the building’s architectural language, whether that’s heritage, loft-style, or ultra-modern.
Customization and Finishing Options
Reynaers understands that every project is unique. Therefore, SlimLine 38 offers extensive customization:
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Finishes
Available in a wide variety of RAL colors with matte, gloss, or textured finishes. Dual-color options enable contrast between interior and exterior surfaces. -
Hardware Integration
Compatible with modern locking systems, concealed hinges, minimal handles, and panic bars. Whether your focus is on seamless design or top-tier security, SlimLine 38 adapts. -
Threshold Variants
Offers low and barrier-free thresholds for improved accessibility and visual continuity, particularly between interior and exterior spaces. -
Glazing Options
Supports double and triple glazing, laminated or acoustic glass for better energy efficiency and noise control.
In addition, the system features concealed drainage solutions that maintain the clean, uninterrupted lines of the frame — a subtle but impactful detail in design-led architecture

Versatile Applications Across Building Types
SlimLine 38 is suitable for a wide range of architectural projects. In residential buildings, it serves as a sophisticated front door or interior partition, offering elegance and lightness. The ultra-slim profiles allow for maximum daylight entry and panoramic views — perfect for villas, townhouses, and apartments.
In commercial spaces, such as boutiques, offices, or galleries, the steel-look aesthetic creates an upscale, design-forward atmosphere while maintaining practical performance standards. SlimLine 38 is also a top choice in restoration projects, where maintaining architectural integrity is essential, but updated thermal and acoustic insulation is required.
Sustainability and Longevity
Crafted from fully recyclable aluminium, SlimLine 38 is an eco-conscious system aligned with sustainable building principles. By offering excellent insulation with minimal materials, it helps reduce a building’s operational energy use, contributing to long-term environmental goals.
The system’s durability ensures that it remains functional and aesthetically pleasing for decades, even in high-traffic or weather-exposed locations. Combined with low maintenance requirements, SlimLine 38 delivers enduring performance for both homeowners and developers.

Why Choose SlimLine 38?
Whether you are restoring a historic façade or designing a minimalist modern home, SlimLine 38 delivers unmatched style and performance in one system. It embodies elegance, precision, and environmental responsibility — ideal for architects and designers who value both form and function.
Highlights Recap:
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Ultra-slim steel-look aluminium profiles
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Excellent energy and acoustic insulation
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Certified RC2 and PAS 24 security
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Multiple design variants: Classic, Ferro, Cubic
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Fully customizable with hardware, glass, and colors
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Suitable for residential, commercial, and renovation projects
Infinite Possibilities

SlimLine 38 is a highly insulated system inward and outward opening windows and doors, which combines elegance and comfort, with a unique design. This special slender steel look is the perfect solution for modern architecture and renovation of steel-framed windows, respecting the original design but offering a thermally improved solution.
The SL 38 system is available in 3 different minimalistic design variants, Classic, Ferro and Cubic, to perfectly match the architectural aspect of the building. The windows and doors can be provided with double and triple glazing without losing the ultra-slim look.
In combination with its superior insulation capabilities, the system provides the perfect harmony between durable material, clean design and demanding architectural challenges.