Alitherm 300 is a versatile range of profiles that can provide many solutions for residential and light commercial applications. It can create traditional casement windows inspired by the elegance and styling of timber products, or contemporary style windows designed for modern homes or offices.

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.

  • British Standard Kitemarked system KM 81580 KM 81543
  • The system features an extended polyamide thermal break which improves the overall U Value of the profile, allowing Alitherm 300 to achieve a Window Energy ‘A’ Rating when used in conjunction with the correct double or triple glazed unit
  • The system is suitable for both internally or externally beaded, side or top hung open out windows
  • Profiles have the option of either ovolo, chamfered or square edges
  • Frame options for both standard and slim-line stays
  • Option of either multi-point or cockspur locking handles

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

Window energy rating A
U Value 1.5W/m²K using correct glass unit
Air Class 4, 600Pa
Wind Class AE, 2400Pa
Water Class E, 1200Pa
Document L Compliant Yes
Kitemark Yes
BS 6375-1:2009 Yes
BS 7950:1997 Yes
BS 4873 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) 1300mm
Glazing (mm) 24mm, 28mm, 32mm, & 36mm double or triple glazed units
Frame Depth (mm) 53mm & 70mm