Aluminium Doors & Windows

The Alitherm Series - Alitherm 500


The Alitherm series of windows offer a range of high quality glazing solutions for side hung, top hung open out, top swing reversible and parallel opening casements, suitable for both the residential and commercial markets.

  • Window Energy Rating A
  • BRE Green Guide A
  • U Values up to 1.2 W/m² and glass unit
  • Includes the Kitemarked systems Alitherm 600 & 800 with PAS 24: 2012 Security K depending on system


The latest addition to the Alitherm suite of window and door systems, Alitherm 500 provides a range of high quality windows. With options including side hung and top hung flush casement windows, Alitherm 500 windows are suitable for both residential and light commercial applications.

The Alitherm 500 window system incorporates Smart's 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. Alitherm 500 is available in a choice of standard and non-standard colours, with single and dual colour optionsincluding Smart's own Naturals, Sensations, Alchemy and Cotswold colour ranges.


  • Window Energy Rating B
  • BRE Green Guide A+
  • U Values up to 1.4 W/m²K (depending on design and glass unit)
  • Kitemarked - which includes PAS24:2012 security and high weather performance.

Technical Specifications


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

WER Rating B
U Value 1.4 W/m2K
Air Class 4, 600Pa
Water Class E1050, 1050 Pa
Wind Class AE2400, 2400Pa
Document L Compliant Yes
Kitemark Yes
BS 6375-1:2009 Yes
PAS 24:2012 Yes

Side Hung Max Width (mm) 700mm
Side Hung Max Height (mm) 1400mm
Top Hung Max Width (mm) 1400mm
Top Hung Max Height (mm) 1400mm
Glazing (mm) 24mm & 28mm
Frame Depth (mm) 59.5mm
Typical Sightlines (mm) 63.5mm