Reynaers CS77 offers both inward and outward opening in a variety of shapes to suit any architectural project.

Energy Efficient

CS77 is a thermally improved three-chamber system for windows and doors that uses fibreglass reinforced polyamide strips with ribs and/or hollow chambers to guarantee high insulation levels.

High Performance

A double butt strip between the frame and vent, and a lowered drainage, ensure superior wind and water tightness.


CS77 is available in both Inward and Outward opening configurations, and different inner and outer colours are possible to match any environment.  CS77 is also compatible with Ventalis – Reynaer’s innovative self-regulating ventilation system.


Maximum Width (Open Out – Side Hung)


Maximum Height (Open Out – Side Hung)

Down to 1.57

U-Value (W/m2k)


EPDM Rubber Seals


Functional Square Look Frame


Triple Chamber for Superior Insulation

Technical Specifications
U ValueDown to 1.37W/m2k
Windows Energy Rating (WER)A
AirClass 4, 600pa
WaterClass E, 1200pa
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.

Eco System

Eco System is a high performance aluminium system that combines aesthetic design with energy efficiency.


Reynaers CS68 aluminium windows have everything that your customers want – at a price they’ll be happy to pay.


CS77 is the perfect solution to any glazing project – versatile, secure and high thermal insulation performance.

CS104 Passivhaus

With patented insulation technology CS104 achieves unparalleled insulation values for aluminium in the building industry.