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Alitherm 800

Third party certifications:
  • BRE Certificate

    Certificate type

  • QA Certificate

    Certificate type

Smart Systems Ltd

Thermally broken aluminium, side-hung, top-hung or fixed casement window system.

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+44 (0)1934 876100 www.smartsystems.co.uk

All general light-use applications.


Thermally broken aluminium side-hung, top-hung or fixed casement window system incorporating 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 800 is available in a choice of standard and non-standard colours, including metallic, dual colour, Smart’s Sensations textured, and Alchemy anodized effect finishes.

Features and benefits:

  • An enhanced system designed to comply with the revisions to the Building Regulations (E&W), Document L compliant.
  • High thermal performance window suitable for all general use applications.
  • Will achieve U-values under 1.6 W/m²K when used in conjunction with correct double glazed sealed unit.
  • BRE Green Guide A+ Rating.
  • System can achieve Window Energy A Rating.
  • Extended chambered polyamide thermal breaks provide excellent thermal performance.
  • British Standard Kitemarked system – KM 81580 and KM 81543.


All general light-use applications.

General information


Uniclass 2015
Pr_30_59_98_02 Aluminium window unitsPrimary
Specification data - Aluminium window units
Product Reference

Alitherm 800


Consult manufacturer

Third-party certification

British Standard Kitemarked system – KM 81580 and KM 81543

Dimensions and configurations

As drawing

Insert reference.

As schedule

Insert reference.

Product performance -
Fire performance -
Fire resistance

Manufacturer's standard

Weather performance -
UK exposure category

Manufacturer's standard

Air permeability

Class 3, 600 Pa


Class E, 1050 Pa

Resistance to wind load

Class A5, 2000 Pa

Durability -
Operation and strength characteristics

Manufacturer's standard

Load bearing capacity of safety devices

Manufacturer's standard

Safety -
Anti-ligature standard

Consult manufacturer

Security level

PAS24: 2012

Environmental -
Frame to glazing ratio (maximum)

Manufacturer's standard

Background ventilation

Manufacturer's standard

Acoustic performance rating

Manufacturer's standard

Thermal -
Whole window U-value

Up to 1.3 W/m²K using 0.7 mm centre pane or up to 1.5 W/m²K using 1 mm centre pane

British Fenestration Rating Council Window Energy Rating

Can achieve Window Energy A Rating

Frame -

Manufacturer's standard

Finish as delivered -

Marine quality powder coat


Insert single or dual colour requirement from metallic, dual colour, Smart’s Sensations textured, and Alchemy anodized effect finishes.

Film thickness (minimum)

Manufacturer's standard


Manufacturer's standard

Glazing or infill -

Consult manufacturer


Insert requirement, available 24–28 mm as double or triple glazed units.


Manufacturer's standard

Operation -


Fixing features

Manufacturer's standard





Standard product features



Frame depth:

70 mm.

Thermal break:

Extended polyamide thermal break to enhance thermal performance.

Product Options

Dimensions and configurations:

  • Side-hung: Available up to 700 x 1400 mm (w x h).
  • Top-hung: Available up to 1400 x 1300 mm (w x h).

Third party certifications
  • Certificate: Green Guide A+ Rating
  • Kitemark: Certificate: KM 81580 and KM 81543
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