The Duraflex Diamond Suite - Making The Difference

Flush Casement Window

Flush Casement

Our Flush Casement Sash delivers traditional aesthetics but maintains the Diamond Suite performance, designed with our high performing Q-lon gasket system and available in welded and mechanical joint options. The flush sash is compatible with the current range of outerframe and transom combinations, offering complete system compatability.

Compatible with 28mm and 36mm beading options, as well as our range of ancillary items.

Frame Offering
  • Choice of 4 outer frame heights - 46mm, 58mm, 68mm & 83mm
  • Choice of 3 transom heights - 63mm, 72mm & 86mm
  • 5 chamber outerframe options
  • All sections available featured and bevelled
  • Available fully welded or mechanically jointed
  • High performance Q-Lon gasket supplied in all mainframe sections
Flush Sash
  • Flush sash to accept 24mm to 36mm glazing
  • Eurogroove position to allow night vent facility
  • Full depth eurogroove
  • Optional central seal
  • Mechanical and welded sash options
  • 4 glazing thicknesses - 24mm, 28mm double & 36mm or 44mm triple

The Duraflex Diamond Suite is available in both Standard White and Brilliant White options; all using our non-lead PVCu. To satisfy the most discerning homeowner, we also supply a comprehensive range of solid and woodgrain foils, available ex-stock and from a 5 day lead time for speciality foil finishes.

colour options

At Duraflex our experienced in-house support team provides a ‘one stop’ service for resolving your technical enquiries – from industry regulations and accreditation changes to product information.

  • Technical Assist dedicated Support Team
  • Assistance with factory layouts and planning
  • Wind loading calculations and advice
  • Accreditation, Regulations & Standards advice
  • In-house Thermal Calculations - fully approved simulators

We also have a dedicated team of mobile service engineers covering the UK and Ireland bring their expertise to suit your needs by providing tailored on-site support to assist your company.

technical support
technical support
technical support
technical support


Benefit from the ultimate Diamond Suite system range of profiles, supported with our complete fabricated product service.


High performing, multi-chambered range of window and door products - designed for today's consumer.


Be inspired with our complete marketing and sales support solution, designed to help grow your business.


Benefit from access and support from our industry leading experts. All here to support your business needs.


From the first meeting to your first day of production and beyond, our changeover team will be at your side.


We seek excellence in every aspect of business and set the same standards in our commitment to the environment.