70 mm Flush Casement Windows

Flush casement windows which meet the classification for weather tightness to BS 6375-1. The actual performance will depend on size and style.

70 mm deep, internally beaded windows with a deep, bevelled appearance. Designed with five chambers in all profiles and fully compatible; they can also incorporate triple seals to maximize thermal performance.

The special design of the flush casement is ideal for residential housing to complement heritage style properties.

General information


[Size, Minimum and maximum window sizes vary across the range of window styles; please consult the manufacturer for further details]


Uniclass 2015

Pr_30_59_98_92 Unplasticized polyvinyl chloride (PVC-U) window unitsPrimary


L10/30 PVC-U windows

L10/350 PVC-U windows

Specification data - Unplasticized polyvinyl chloride (PVC-U) window units

Product Reference

Optima 70 mm Flush Casement Windows

Colour/ Finish



See 'Options' below and insert requirements.


See 'Options' below and insert requirements.


28 mm insulating unit, glazed internally

Georgian bars

Leaded glass

Patterned glass


Controllable ventilators

Multi-point espagnolette locking

Permanent ventilators


Not required

Sub frame

Triple seals

Standard product features


Acrylic modified high quality impact resistant white PVC-U extrusion, producing a rigid multi-chamber profile to BS EN 12608, manufactured in accordance with BS EN ISO 9001 and BS EN ISO 14001 and BES 6001 Responsible Sourcing.


Specific members are reinforced with galvanized carbon steel to BS 7412 sealed within the profile central cavity.


  • Double glazing to BS 6262 can be supplied using 24 mm insulated sealed units, depending on thermal and acoustic requirements - double glazed units to BS EN 1279.
  • Post co-extruded glazing beads are provided throughout.
  • Bead groove improved to ensure a more secure fit in accordance with PAS24.
  • Bubble gasket for consistent compression seal around glass and sash to frame.


  • Security features multi-point mushroom espagnolette, with night vent facility and lockable handles (dependent upon fire egress requirements).
  • All hardware meets the requirements of BS 7412.
  • Windows fitted with high security hardware meet the requirements of PAS 24: 2012.


1.3 W/m²K and A rated WER.

Product Options

Colour/ Finish:

Consult manufacturer for further details and lead times.

  • Agate grey RAL 7038.
  • Anteak.
  • Anthracite grey (smooth) RAL 7016.
  • Anthracite grey RAL 7016.
  • Basalt grey RAL 7012.
  • Black brown RAL 8022.
  • Brilliant blue RAL 5007.
  • Chartwell green BS14C35.
  • Cream RAL 9001.
  • Dark green RAL 6009.
  • Dark oak FL-F1.
  • Dark red RAL 3011.
  • English oak.
  • Hazy grey RAL 7001.
  • Irish oak.
  • Light oak RAL 8001.
  • Mahogany RAL 8017.
  • Natural oak FL-G.
  • Rosewood RAL 8017.
  • Rustic oak 1.
  • Siena PR.
  • Signal grey (smooth) RAL 7004.
  • Slate grey (Finesse) RAL 7015.
  • Slate grey RAL 7015.
  • Steel blue RAL 5011.
  • Swamp oak ST-F.
  • Walnut V.
  • White RAL 9010.


Minimum and maximum window sizes vary across the range of window styles; please consult the manufacturer for further details.


Controllable or permanent ventilators can be fitted into the head of the frame immediately above the sash, if required.

Third party certifications
  • BES6001 : Responsible Sourcing
  • Kitemark - KM12895 - BS EN 12608 Profile
  • Kitemark - KM33523 - PAS24/ BS EN 12608 Enhanced Security Windows
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