Alitherm Heritage provides the ideal solution for heritage applications such as listed building renovations and large scale replica-refurbishment projects where planning constraints are to be considered.

The window is designed to be built as a series of horizontal modules which can be stacked using horizontal couplers to form a multi-part window featuring a specially design drip bar between modules.

Alitherm profiles utilise Smart’s innovative polyamide thermal break technology which creates a barrier between the cold air outside and the warm air inside. This technology significantly reduces thermal transmittance and enhances the overall U Value of a product and is designed to meet the exacting requirements of Document L 2010.

Alitherm products are available in a choice of standard or non-standard colours, including metallic, dual colour, Smart’s Sensations textured, and Alchemy anodised effect finishes.

Please note, Alitherm Heritage has been tested to PAS 24:2012 for casement windows and fixed lights only.

  • Fixed windows
  • Single or double sash, side hung open out casements
  • Top hung open out casements
  • Polyamide thermal break provides enhanced thermal performance
  • Designed as a direct replacement for steel windows

Brand Alitherm
Material Aluminium Polyamide
Dual Colour Yes
Thermally Broken Yes
NBS Available Yes

Window energy rating B
U Value 1.5W/m²K (using 1.0W/m²K glass unit)
Air Class 4, 600Pa
Wind Class AE, 2400Pa
Water Class 9A, 600Pa
Document L Compliant Yes
Kitemark Yes
BS 6375-1:2009 Yes
BS 4873 Yes
PAS 24:2012 Yes

Side Hung Max Width (mm) 700mm
Side Hung Max Height (mm) 1400mm
Side Hung Max Weight (kg) 40kg
Top Hung Max Width (mm) 1400mm
Top Hung Max Height (mm) 1300mm
Top Hung Max Weight (kg) 35kg
Single Door Max Width (mm) 900
Single Door Max Height (mm) 2100mm
Glazing (mm) 24mm, 28mm, 32mm & 36mm double or triple glazed units
Frame Depth (mm) 47mm
Typical Sightlines (mm) 59mm