Aluna Windows

Seasonmaster Aluna Windows

The Seasonmaster Aluna ACW81 Window’s super slim sash offers minimal sightlines for optimal views. Secure to PAS24, the Seasonmaster Aluna Window exceeds Part L compliance with WER rating A and new build requirement of 1.4 W/(m2k) is achieved when combined with highly energy efficient glass.

The Seasonmaster Aluna window can be used as a side light with openers that seamlessly couples with our Aluna bifold door system and even shares some of the same components! It can even be glazed from the inside and the outside for simple, pain-free installation.

Seasonmaster Aluna Window


The Seasonmaster Aluna window is available as a contemporary flush sash in our highly desirable super slim sash to complement the slim profile of modern bifold and patio doors.

With its elegant, contemporary design, the Seasonmaster Aluna window perfectly complements our other Aluna systems, bringing you a cohesive range of products to complement one another.

Seasonmaster Aluna Windows Configurations


Some of the most popular applications that can be made from the Aluna window system are listed below but there are many more besides. Please refer to the configuration diagram.

  • Can be used as a side light with openers and easily couples to our Aluna bifold door system.
  • Side hung opener next to a fixed frame.
  • French casement window with double side hung openers.
  • Standard casement window – top opener over a fixed frame.
  • Crucifix 4-pane window with 2 top openers over 2 fixed frames.
Seasonmaster Aluna Windows Colours


Aluna windows are available in any RAL colour upon request. Perfectly complementary with our other products, the standard colours that we have in stock are Grey 7016 (Matte), Black 9005 (Matte), White 9016 (Gloss), Grey 7016 (Matte) on White 9016 (Gloss), Black 9005 (Matte) on White 9016 (Gloss), Textured Grey 7016 and Mill Finish.

Seasonmaster Alunet Aluminium Cills


Our range of universal aluminium cills with pre-drilled screw ports are compatible with most other door and window systems, as well as with our Aluna window system. They are effective in directing water away from brickwork and also offer an additional design element to the aesthetics of the window.

Our aluminium cill is more robust than PVC alternatives and comes complete with plastic push-in colour matched end caps, in our standard stock colours, for a secure and sleek finish.

Cill sizes are 90mm, 150mm, 190mm and 230mm.

Available in Black, White, Anthracite Grey, textured Mill finish, and dual colours of White/Anthracite Grey and Black/White and can also be powder-coated in any RAL colour.

Seasonmaster Aluna Windows Glazing


All configurations of the ALUNA window system can be finished in several glazing options to create a style that suits any property. Choose from:

  • Double glazed
  • Triple glazed
  • Integral blinds
  • Heritage-look astragal bars
  • Solid panel inserts



  • Thermal Efficiency: Window Energy Rating (WER) of A, which complies to Part L.
  • Weather Tightness: Air permeability Class 4 (600 Pa) EN1 026:2000, EN 12207:1999
  • Water Tightness: Side-hung: Class 8A (450 Pa), Top-hung: Class CE2400 (2400 Pa; 1/300). EN 12211:2000, EN 12210:1999
  • Security: PAS24: 2022 (class W)


  • Frame-to-sash sightlines: 82mm, 70mm
  • Max. sash height: 1500mm
  • Max. sash width: 1500mm (top hung) 900mm (side hung)
  • Max. sash weight: 50kg (top hung) 40kg (side hung)
  • Max. glazing thickness: 28-44mm
  • Types of glazing: External/reverse adapter/dummy sash
  • Frame depth: 81mm flush / 73mm standard
  • Sash depth: 73mm