Aluminium Doors & Windows

The Alitherm Series - Alitherm 300


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


All general light use applications


  • 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

Technical Specifications


Finish Single or dual colour, marine quality polyester powder coat as standard
U Value U Value 1.5W/m2K using 1.0 centre pane U Value 1.2W/m2K using 0.7 centre pane
Air Class 4, 600Pa
Water Class E 1200Pa
Wind Class AE, 2400Pa
Document L Compliant


Frame Depth 53mm & 76mm
Glass 24mm, 28mm, 32mm & 36mm double or triple gazed units
SH Max o/a Width 700mm
SH Max o/a Height 1400mm
TH Max o/a Width 1400mm
TH Max o/a Height 1300mm
(For sizes outside of these parameters, contact us).