AA451PT Aluminium Thermally Broken Framing System

The thermally efficient 451PT Framing System was designed in close collaboration with Scape. The system meets the needs of the education, refurbishment and new build markets. The 451PT is also suitable as a ground floor alternative to curtain wall use on commercial projects in the public sector, and is ideal for large display windows in the retail sector.

The system provides slimline, dual-colour and multi-glazed framing modules of varying widths and heights that feature fixed lights, opening vents and insulated panels.

Features/ Benefits:

  • Meets the thermal requirements of the current Building Regulations (E&W).
  • Narrow 50 mm sightlines ensure visually pleasing aesthetics.
  • Can be used for large window displays: an excellent tried and tested solution for retail applications.
  • Flush-glazed, therefore easy to apply.
  • Concealed drainage therefore moisture infiltration directed to the outside of the building.
  • Suites with the AA®540 Series Windows, AA®3610 Vertical Sliding Window and all door systems.

General information



Permacover anodized to BS 3987

Permacover polyester powder-coated to BS 6495

Uniclass 2015

Ss_25_10_20_90 Unitized curtain walling systemsPrimary


H11/110 Curtain walling

Specification data - Unitized curtain walling systems

Product Reference

AA451PT Aluminium Thermally Broken Framing System


Insert requirements.

Glazing/ infill thickness

28 mm glass limitation.


Permacover anodized to BS 3987

Permacover polyester powder-coated to BS 6495




Insert requirements.


Insert requirements.

Film thickness

40 micrometres

60 micrometres

80 micrometres

Standard product features


The system uses shear block construction where contoured shear blocks are screw fixed to the verticals, forming a spigot for horizontal members.


Glazing options between 24–28 mm can be accommodated.

Testing/ accreditation:

Independently weather performance tested to BS 6375-1.

  • Air infiltration (BS EN 12207): Class 4 (600 Pa).
  • Watertightness (BS EN 12208): Class 9a (600 Pa).
  • Wind resistance (BS EN 12210): Class E2400 (2400 Pa).

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