Aluminium Doors & Windows

The Alitherm Series - Alitherm 800


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.


  • Highest thermal performance window suitable for all general use applications
  • Will achieve U Values under 1.6w/m²K when used in conjunction with correct double glazed sealed unit
  • Alitherm 800 windows achieve a Window Energy 'A' Rating
  • Extended chambered polyamide thermal breaks provide excellent thermal performance
  • British Standard Kitemarked system
    KM 81580
    KM 81543

Technical Specifications


Finish Single or dual colour, marine quality polyester powder coat as standard
U Value 1.3W/m²K using 1.0 centre pane
Air Class 3, 600Pa
Water Class E, 1050Pa
Wind Class A5, 2000Pa
Security PAS 24:2012
Document L Compliant


Frame 70mm
Glass 24mm, 28mm double or triple glazed 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).