Aluminium windows make a stunning statement in any home. KC75 aluminium windows have slim frames that maximise the amount of natural light, making them perfect for both traditional and modern homes.

With a choice of design options, this system comes with a multitude of practical features for today’s modern day living, while exceeding the energy performance requirements of current Part L Building Regulations.


  • PAS 24 tested
  • Top and side hung applications
  • Joined using mechanical corner cleats
  • 75 mm polyamide sub frame section, for easy to install modular windows
  • Egress option available
  • Slimline aluminium frames to maximise glass areas
  • Slimline internal glazing option
  • Cills, add ons, curtain walling insert & coupler sections available
  • Available as escape window or easy clean
  • Flush sash option available
Technical information
Air permeability* Class 3
Water tightness* Class 9A
Wind load* Class C5
Thermal insulation Uw** Up to 1,2 W/m2K


* Air/Water/Wind tests according to standards BS6375-12009 & BS6375-2

** Please note: U-Values are dependant on size and glass U-Values.

Maximun size (top hung): 1500x1500 mm

Maximun size (side hung): 900x1500 mm

Maximium weight: 50 kg

Maximun glazing: 56 mm

Polyamide: 32 mm

75mm polyamide sub-frame section 

Weather tested to BS6375-12009 & BS6375-2 

PAS 24:2012 security accreditation 


KC75 casement window has an extensive range of sections giving versatility and a wide range of design options. Its flush or chamfered internally beaded sash sections make this system an ideal choice for residential or commercial applications. Its complete range of 75 mm subframe and coupling sections make this window appropriate for ribbon runs or school refurbishment and commercial projects.


With a glazing range from 24 to 56 mm the system can easily accept triple glazed units or even units incorporating interstitial blinds. Also, the HOi version introduces foam strips to further improve thermal efficiency for higher specification projects.


KC75 system offers high thermal efficiency giving a Uw value of 1,4 W/m2K. The window has been tested in accordance with BS6375-1 2015 for Air, Water and Wind resistance making KC75 an ideal choice for exposed or remote sites.


This system offers a reverse rebate adaptor, compatible on both fixed and opening lights, allowing internal beading in a cost-effective manner. Its clever design “double beaded” transom options negate the use of a reverse rebate adaptor, improving thermal efficiency and reduces sightlines.

Register in our digital space Exlabesa 360 to have TechDocs at your disposal: a complete documentary library with all the technical information about Exlabesa Architecture’s aluminium systems.

Access Exlabesa 360 and enjoy exclusive content and functionalities:

  • Catalogues, tests, reports, sections, DAP, BIM objects…
  • Up to date information
  • Notifications of updates and news