Sunflex SEF

Aluminium - SEF Windows

Pas 24 and SBD

The Sunflex SEF aluminium window system is designed to compliment our range of bifold doors, sliding doors and entrance doors. Offering complete project satisfaction these systems are available in a wide range of configurations. Whilst both systems share a contemporary style and slim line frame with square edge beads they offer different levels of specification to ensure we are able to tailor to all types of projects and requirements.


  • Up to 48mm glazed unit accommodated.
  • Available as Side-hung, top-hung, tilt and turn, fixed frames and angled frames. 
  • Glass to glass corners option.
  • Glazed with a centre pane of 1.2W/m2K = overall U-Value of 1.5W/m2K.
  • Glazed with a centre pane of 1.0W/m2K = overall U-Value of 1.4W/m2K.
  • Glazed with a centre pane of 0.7W/m2K = overall U-Value of 1.2W/m2K.
  • Frame depth of 65mm or 99mm.

Features & Benefits:

Profile & Appearance

  • Modern slim line profiles and contemporary square beads.
  • Matching windows, doors and sliding doors available. 
  • Concealed hinges and locking mechanisms.
  • Fully customisable. Available with transoms, mullions and insulated panels.
  • Supplied factory finished.

Thermal Efficiency & Weather Tightness

Officially tested and certified to ensure they really do keep bad weather outside.

Sunflex SEF Window

  • 1.0W/m2K centre pane U-Value = Overall frame and glass 1.4W/m2K.
  • 0.7W/m2K centre pane U-Value = Overall frame and glass 1.1W/m2K.
  • Accommodates glazed unit thicknesses up to 48mm.
  • Security tested to BS 7950:1997.
  • Weather tested to BS6375 Part 1:2009.
  • Acoustic performance tested at Rw=36dB. Further upgrades available.
  • Water tightness 900Pa (Class 9a).
  • Air permeability 600Pa (Class 4).
  • Resistance to wind load 2400Pa (Class AE).
  • EPDM gaskets. Offering a long life weather tight seal.

A good U-Value does not mean a door keeps out the wind and the rain. Make sure you check out a doors weather test results before you buy.

High Security

  • Secured by Design certified. Designed and manufactured to police preferred specification.
  • Tested to  BS6375 Weather & BS7950 Security.
  • Key locking handles are fitted as standard to our windows unless the window is classed as a means of escape, when a non-lockable version will be used.
  • Restrictors are available and can be fitted to windows at high level for safety.
  • Internally glazed where configuration permits, preventing the glass being easily removed from the outside.
  • Concealed hinges and locking mechanisms.
  • Slim gasket between panels to help against panels been levered apart by potential intruders.
  • Toughened safety glass, laminated security glass, solar control glass and many other specs available.




  • Max width side-hung = 700mm
  • Max height side-hung = 1400mm
  • Max width top-hung = 1400mm
  • Max height top-hung = 1300mm
  • Max width tilt-and-turn = 1700mm
  • Max height tilt-and-turn = 2400mm

The maximum widths and heights supplied below cannot be used together. Please contact us for further clarification.


Wide Range Of Finishes


  • Five standard frame colours, Silver Anodised EV1, or in semi-gloss: Anthracite Grey RAL 7016, Grey Aluminium RAL 9007, White Aluminium RAL 9006, Traffic White RAL 9016.
  • Choose from over 200 frame colours available including brushed steel, textured, woodgrain and extreme marine protection.
  • Dual colour finish available (different internal and external colours).

Marine and swimming pool environment finishes 

  • We recommend a marine treatment if you are within 5000 metres of the coast or around a swimming pool/chemical environment. Stainless steel handles would not be suitable for this location.