With sightlines of just 65mm Outer-to-Sash and 110mm Sash-to-Sash – SL68 beats most other systems hands down.

Great Energy Performance

SL68 is available with both Standard and HI insulation levels – with U-Values down to 1.5 w/m2K with Double Glazing, and Water and Wind performance of  900 Pa and 2,400 Pa respectively.

Super-Slim Sightlines

With sightlines of just 65mm Outer-to-Sash, and 110mm from Sash-to-Sash – SL68 beats most other systems hands down.

Designed for the UK

SL68 is designed specifically for the UK market, optimised for maximum daylight and smaller windows up to 1,200mm x 1,200mm.

Unbeatable Pricing

Despite being the slimmest casement window available on the market, and fabricated from premium aluminium, SL68 prices are around 25% lower than Eco System windows.

  • Huge range of design options

  • Rigorously tested to offer the highest levels of performance

  • Industry-leading thermal insulation & weather resistance

  • Industry-leading security – SBD

  • Enhanced security with hinge-side security brackets

  • Two-stage keep offering night ventilation

  • Multi-point locking system

  • Double- and triple-glazed options

  • Choice of internal or external glazing

  • Easy-clean egress hinge option

  • High-quality stainless steel friction stays

  • Optional trickle vent

  • Four sill options

  • Dual-colour option – different colour inside and out

  • Adjustable corner profiles for bay and bow windows

* Above specifications may not all be standard – some are optional extras


Maximum Width (Side-hung)


Maximum Height (Side-hung)


Maximum Width (Top-hung)


Maximum Height (Top-hung)


65mm Sightline from Outer to Vent


A Rated Window – even with Double Glazing


Internally beaded vent

Technical Specifications
U Value• Down to 1.1W/m2k (Triple Glazing)
• Down to 1.5W/m2k (Double Glazing)
Windows Energy Rating (WER)A
AirClass 4, 600pa
WindClass AE, 2400pa
Document LCompliant

Get A Quote

Whether you have a current project in mind, or you’d just like to give pricing guidance to your customers, contact us for pricing and options today.

SL68 Gallery