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NBS Source


Suitable for residential and commercial applications.


Thermally broken aluminium, vertical sliding windows, incorporating innovative polyamide thermal break technology, which creates a barrier between the cold air outside and warm air inside. This technology significantly reduces thermal transmittance and enhances the overall U-value of the product.

VS600 incorporates the traditional styling of sash windows with the advantages of a modern thermal aluminium profile. A traditional sash window may be used in heritage and conservation areas where Georgian and Victorian architecture is predominant. The ease of operation and excellent natural ventilation rates means that VS600 is also suited to high occupancy buildings.

The window offers a flush opening with no projection into or out of the building, it is a style of window which is frequently used in schools and hospitals. The hardware utilizes various standard hardware designs. As well as the vertical sliding sash, VS600 features a ‘tilt in’ operation that facilitates the cleaning of the external glass. The system features a low line glazing gasket that accepts 28 mm sealed units.

The system can achieve overall U-values of 1.6 W/m²K and a Window Energy Rating (WER) C rating. VS600 windows also feature concealed drainage and a concealed coupling option. Assembly of VS600 is optimized through a square cut outer frame and sash joints which require minimal machining aiding fabrication.

Features and benefits:

  • An enhanced system designed to comply with the revisions to the Building Regulations (E&W), Document L compliant.
  • System can achieve Window Energy C Rating.
  • Decorative sash horns available.
  • Extended chambered polyamide thermal breaks provide excellent thermal performance.

General information




Pr_30_59_98_02 Aluminium window unitsPrimary


L10/25 Aluminium windows

L10/330 Aluminium windows

Product range

Aluminium Windows

Specification data - Aluminium window units


To BS EN 6375-1: 2009.

Dimensions and configurations

1600 x 2800 mm (maximum).

  • W x H: Insert requirement.
  • Maximum width of 1600 mm is based on a 1300 mm frame height.
  • Maximum height of 2800 mm is based on a 750 mm frame width.

Product performance


Weather performance


Air permeability

To Class 5A, 200 Pa.


To Class 7A, 300 Pa.

Resistance to wind load

To Class A4, 1600 Pa.



Whole window U-value

1.6 W/m²K.

British Fenestration Rating Council Window Energy Rating





Square cut.

Finish as delivered



Marine quality powder-coat.


Insert single colour requirement, contact manufacturer for information.


Glazing or infill



28 mm double glazed unit.





Perimeter edge/ thermal break

Extended polyamide thermal break.



Digital objects

Platform Compatible Version Certified to



Download now from NBS National BIM Library

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