Crittall Replacement Windows

Slim Line 38 for
authentic steel appearance

SL38 aluminium windows have been designed specifically to replace existing steel windows. They replicate the appearance and slim sightlines of traditional steel windows, and come as close as you can get to a steel window, but with a thermally broken profile.

These steel-looking windows not only provide an authentic appearance, but offer much improved security, thermal efficiency, and come at a fraction of the cost of steel!

A perfect match for both: new-build constructions and the renovation of steel-framed windows and doors, SL38 can be fabricated to suit almost any period property and specified for a wide range of applications. It respects the original design and offers a thermally improved solution.

Get a classic steel look without breaking the bank!

Light, Elegance & Comfort

The slim line steel-look SL38 window system perfectly imitates the look of the steel crittall window frames and benefits from much better performance.

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This highly insulated system of inward and outward opening windows and doors combines lightweight, elegance and stability with a unique design. Being really versatile, SL38 is perfectly suited for the retention of the existing structures where customers might want to preserve a vintage look of their windows, or in renovation projects, where steel frames have to be replaced.

It’s a perfect harmony between durable materials, clean design and demanding architectural challenges with superior insulation capabilities.

Minimalistic frames are reinforced by an invisible drainage system, avoiding the use of drainage caps on the exterior of windows and doors. Thanks to the special modification of the design the system can be available with hidden hinges.

Benefits of SL38 window system:
  • Look and feel of steel with the performance of aluminium
  • Superior insulation capabilities
  • Minimalistic frames
  • Durability and low maintenance
  • Variety of configurations
  • Ideal as a Crittall Windows replacement system
  • Fraction of a price of steel
  • Air tightness: Class 4 (600Pa)
  • Wind load resistance: Up to 2000 Pa (class 4).
  • Water tightness: Up to 600 Pa (class 9A).
  • Acoustic performance: Rw(C;Ctr) = 38 (-1; -4) dB / 45 (-1; -5) dB, depending on glazing type
Thermal insulation (to EN 10077-2:2012):
  • Uf-value down to 1.7 W/m2K depending on the frame/vent combination and the glass thickness.
  • Uw of less than 1.4 W/m2K for a standard window section
  • Burglar resistance (EN 1628-EN 1630; EN 1627): RC 2
  • Fire resistance (NEN 6069): EW 30

The SL 38 window is available in 3 different minimalistic design variants (Classic, Ferro and Cubic) to perfectly match the architectural aspect of the building. They can be provided with double and triple glazing without losing the ultra-slim look.





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