NBS Source
Curtain Wall


Aluminium curtain walling system incorporates the full range of Profile 22's 70 mm windows and doors which offer greater choice and value for specifiers .

The wide choice enables to meet critical requirements such as thermal insulation, acoustics or weather tightness.


The Curtain walling system is a thermally broken system that integrates the full range of 70 mm windows & doors systems offering a wider choice of product, flexibility and endless design configurations. Specifier can choose from direct glazing insulation or spandrel panels. Ideal for buildings that require large area of fenestration.

Features and benefits:

  • Accepts 70 mm windows and doors. 
  • Makes replacement of individual glazed units easier in the event of damage or breakage.
  • Specifiers can choose from direct glaze insulation or spandrel panels.
  • If in the unlikely event a glazed unit does need to be replaced, the system accepts individual glazed frames. The bead is simply removed and the new glass unit slotted in from the inside, for a simple and quick replacement.
  • The curtain wall system is PVC-U clad; both internally and externally, ensuring colour and material matches for an attractive end result.
  • Window frames, cover caps and cladding panels are fitted post installation minimizing site damage.

Cavity design:

  • Thermal cavity design to AAMA TIR-A8-90 structural performance of poured and de-bridged barriers.
  • Thermally broken aluminium sections to have Chromium Phosphate finish.

General information


Any RAL colour available






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Aluminium, Glass




Ten year


Ss_25_10_20_90 Unitized curtain walling systemsPrimary


H11/110 Curtain walling

Specification data - Unitized curtain walling systems Enhanced data

System performance

Air permeability.



Framing members

70 mm PVC-U clad and Aluminium profiles to BS 1474.


Transom brackets- Stainless Steel BS 970, Grade 430.

Cladding units


Glass units

Double glazed units.

24 mm & 28 mm.

Triple glazed units.

36 mm, 40 mm & 44 mm.

Panels and facings



Direct glaze insulations.

Spandrel panels.

Thermal insulation

Polyamide thermal break has thermal conductivity of 0.168 W/m.k.


Internal linings

BS 7950 Specification for enhanced security performance of casement and tilt/turn windows.

Aluminium alloy to BS 1474, Grade 6063 T6.


Mullion fixing bolts, clamp plate and transom bracket fixing screws - Stainless Steel BS 970 Grade 304 (A2).

Perimeter seals

Weatherproof membranes.

Air permeability

Test Pressure Class C at 600 Pa (Actual air loss 0.04 m³/h/m).

Weather resistance

BS 6375, clause 7 at Test Pressure Class 3000 Pa British Standard Institute - Test report No 261/4541779.

Window and Door Systems

BS EN 12608 Specification for white PVC U extruded hollow profiles, manufactured in accordance with BS EN ISO 9001 and BS EN ISO 14001 and BES 6001 Responsible Sourcing.

Security performance

PAS 23-1 General performance requirements for door assemblies; PAS 24-1 Enhanced security performance requirements for door assemblies.

Environmental information

Country of material origin

United Kingdom


Can be recycled.



Profile 22 Curtain Wall Brochure

Profile 22 Curtain Wall Brochure

Case studies

Woldgate School

Woldgate School

Optima Casement Windows were a central part of a £1.3 million renovation project at Woldgate School and Sixth Form College in Pocklington near York

Optima Casement Windows were a central part of a £1.3 million renovation project at Woldgate School and Sixth Form College in Pocklington near York