Home > Companies > Kawneer UK Ltd > 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.

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).

NBS Specification

NBS Create logo
This product is associated with the following NBS Create clause:
25-80-15/190 Unitized curtain walling system

NBS Specification

NBS Buliding logo
This product is associated with the following NBS clauses:

Product specification

An important note about specifying



Kawneer UK Ltd


+44 (0)1928 502500

Product reference

AA451PT Aluminium Thermally Broken Framing System


[ ______ ]

Glazing/ infill thickness

[ ______ ]


[Permacover anodized to BS 3987]
[Permacover polyester powder-coated to BS 6495]


 - Internal:
[ ______ ]
 - External:
[ ______ ]

Film thickness

[40 micrometres]
[60 micrometres]
[80 micrometres]

Manufacturer details

Astmoor Road,
Astmoor Industrial Estate,
Cheshire, WA7 1QQ
Tel +44 (0)1928 502500
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