A traditional sash window that may be used in heritage and conservation areas where Georgian and Victorian architecture is predominate. The ease of operation and excellent natural ventilation rates means that VS 600 is also suited to high occupancy buildings.

The window offers a flush opening with no projection into or out of the building, this style of window is frequently used on schools and hospitals.

VS 600 hardware has been designed alongside the experts at Caldwell and utilises various standard hardware designs. As well as the vertical sliding sash, VS 600 features a ‘tilt in’ operation that facilitates the cleaning of the external glass.

The system features low line glazing gasket that will accept 28mm sealed units. The system can achieve overall U Values of 1.6W/m²K and a W.E.R. C rating. VS 600 windows also feature concealed drainage and a concealed coupling option.

Assembly of VS 600 is optimised through square cut outer frame and sash joints which require minimal machining aiding fabrication.


Brand VS
Material Aluminium Polyamide
Thermally Broken Yes
NBS Available Yes

Window Energy Rating C
U Value 1.6 W/m²K (using correct glass unit)
Air Class 5A, 200Pa
Wind Class A4, 1600Pa
Water Class 7A, 300Pa
Document L Compliant Yes
BS 6375-1:2009 Yes

Vertical Sliding Max Width (mm) 1600mm (based on frame height 1300mm)
Vertical Sliding Max Height (mm) 2800mm (based on frame width 750mm)
Vertical Sliding Max Weight (kg) 50kg (per sash)
Glazing (mm) 28mm
Frame Depth (mm) 126mm