NBS Source
NTech Fully Reversible Opus Window


NorDan products are suitable across a wide range of sectors such as the private rental sector, off-site manufacturing, student accommodation, high rise tower blocks, affordable housing, private housebuilders/ developers, residential, coastal areas/ coastline and more.


NTech Opus encompasses well balanced ironmongery to ensure the frame can easily be turned 180 degrees for safe cleaning from inside. Solid cleaning restrictors are also integrated for additional safety. The window has a sophisticated and effective child safety restrictor integrated in the hinges for extra peace of mind.

Features and benefits:

  • UKAS approved , PEFC and FSC chain of custody certification.
  • Secured by Design standard.
  • Windows tested to BS 6375-1 and BS 6375-2.
  • Acoustic performance rating of 36 dB Rw.
  • 60-year timber service life with NP3 classification tested to BE EN 599-1.
  • Vacuum impregnated timber treatment process to BS EN 351-1.
  • Ventilator: Products can be fitted with an adjustable, draught proof ventilator providing specified equivalent area on request.
  • Aluminium cladding – designed to stand off 6 mm from the face of the timber to promote self-ventilation and drainage.

General information


Specified to RAL or NCS colour systems with other alternatives available upon request.




Top coat, Akzo Nobel Winflex T635 finish. Opus (92mm) and Opus (105mm).


GSB Sea proof plus Class Master/Premium certification – Architectural powder coating to EN 122061, with a gloss level of 30% matt as standard. Opus (100 mm) and Opus (113 mm).


SAT FOX vertical system with AC pre-treatment process.



Slow grown Northern European Redwood, in accordance with BS EN 9423.


Produced using recycled material , low carbon aluminium, low maintenance.


Ten year

Ironmongery and sealed glazing units: Ten years.

Wood frame: 20 year warranty against rot and decay.

Wood frame with aluminium cladding: 30 year warranty against rot and decay.

All subject to correct installation and maintenance procedures.


Pr_30_59_98_96 Wood window unitsPrimary


L10/210 Wood windows

L10/10 Wood windows

Specification data - Wood window units

Third-party certification

BBA approved. PEFC and FSC Chain of Custody Certification. UKAS Approved.

Product performance


Weather performance


UK exposure category

1200 Pa.

Air permeability

To EN 12207, class 4.

600 Pa.


To EN 12208, class 9A.

600 Pa.

Resistance to wind load

To EN 12210, class 3C.

1200 Pa.



Security level

PAS 24:2016 and Secured by Design licensed.



Acoustic performance rating

36 dB Rw.

Minimum as standard.



Whole window U-value

1.2 W/m²K.

Opus (92 mm) and Opus (100 mm).

0.9 W/m²K.

Opus (105mm) and Opus (113mm).



Wood species

European redwood.

Finish as delivered

Akzo Nobel Winflex T635 water-based micro porous opaque paint finish to specified RAL colour.

Preservative treatment to wood components

Vacuum impregnated using Protim P-VAC11 preservative to EN 351-1:2007.



Adjustable draught proof ventilator.

Glazing or infill



44 mm thick sealed triple-glazing units.

Warm-edge spacer bars - Opus (105 mm) and Opus (113 mm).

26 mm thick sealed double-glazing units

Warm-edge spacer bars - Opus (92 mm) and Opus (100 mm).


Single handled system.




Fully reversible.

Product Reference

Opus (92 mm)

Opus (100 mm)

Opus (105 mm)

Opus (113 mm)

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