thermal separator enriched with glass fiber. The profile structure allows for the construction of large luxurious doors with single or double glazed sealed units. The materials and technical solutions used help achieve a high level of thermal and acoustic protection. These doors are perfect for detached houses as well as apartments that require open spaces.


The WINDOWS 75 window and door system is a modern structure equipped with a thermal barrier guaranteeing visual weightlessness of the structure and maximum use of glazing. Used in exterior architectural elements of buildings requiring high thermal and acoustic insulation.

Application and functionality

  • Fixed or inward opening windows: Turn-Only, Tilt&Turn, Tilt&Slide
  • single or double leaf doors, opening outwards or inwards
  • optional bending of profiles and installation of arched windows
  • windows and doors with anti-burglary hardware
  • optional dual colored structures: the profiles can feature different colors on the interior and exterior
  • installed separately or in aluminum facades
  • optional use of closure sensors – reed switches


  • 3-chamber sections with a depth of: 2,95 inch (window and door frame, door leaf), 3,3 inch (window sash)
  • specially shaped 1,33 inch wide thermal barrier (windows)
  • additional thermal insulation inserts (optional)


  • max. sash width: 62.99 inch
  • max. sash height 102.36 inch
  • max. sash weight 440 lb


  • filling thickness between 0.55 inch and 2.75 inch for opening windows and 0.55 inch – 2.40 inch for fixed doors and windows
air permeability class 4, EN 12207
watertightness class 9A, EN 12208
thermal insulation Uf from 1.0 W/(m²K), Uw from 0.9 W/(m²K)
wind load resistance up to class C4, EN 12210


With OKNOPLAST, embellishing your interior requires attention to the smallest details. Of course, color, material, and shape of the aluminium window are all important when choosing, but let’s not forget the accessories.


A variety of more than 50 colors in any combination of your choice are available for both indoors and outdoors. High-performance multi-layer film that is weather and UV-resistant retains its gloss throughout its life.

Get a personal consultation.

For all questions, problems, and suggestions find an OKNOPLAST expert near you and ask for a quote.