Further technical information such as composition and manufacture, size and weight, performance and sitework...

Composition and manufacture

The NTech low energy window range features:
Double-glazed sealed unit: unit contains low-emissivity glass and argon-filled cavities, typically: 4mm glass, 16mm Argon, ES 4mm glass.
Gasket: the profile of the window sections, and design for drainage, depends on the weather seal being able to provide the required resistance of the gap, between sash and frame, to weather.
Optional aluminium cladding: the optional aluminium rainscreen cladding greatly improves the lifespan of the product and vastly reduces maintenance costs. It can also be powder coated to any RAL colour of the client’s choice.
Groove for extension cill: a variety of aluminium extension cills are available from NorDan to meet the client’s particular design requirements.
Aluminium glazing beads: aluminium glazing beads reduce the level of maintenance and create a more substantial design by allowing full ventilation and drainage. The aluminium is securely clipped into place thus preventing any damage to the window.


Glazing system: the system is self-ventilating and self-draining, therefore no moisture is in contact with the wood. To improve security, the sealed unit is glued into the sash.

Decompression zone: the space between the external surface and the weather seal has been designed as a decompression zone. This neutralises the pressure differentials, and is self-draining and self-ventilating.

Thermal properties

Warm edge technology: much lower thermal conductivity than traditional aluminium spacers. Consequently, the temperature at the edges of the glass is several degrees warmer.


Vacuum impregnation protects the timber from rot, fungal and insect attack.


Insulated frame and sash: a layer of insulation is laminated into the head and jambs of the 92mm frame to greatly enhance energy saving. Timber sourced from sustainable forests, with PEFC full chain of custody.

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NorDan UK

NorDan UK

Helping architects, contractors and clients specify high-performance windows for large and small projects alike.
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 NorDan House, Green Farm Business Pk, Falcon Cl, Quedgeley, Glos, GL2 4LY

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