Window NATURA OptimoXL is made entirely of wood and combines optimal combination of high energy efficiency, attractive appearance and affordable price. It is the most thermally efficient window of Natur O family, which can be upgraded into passive window with the use of thermally modified spruce instead of normal spruce NATURA Optimo XL which was awarded as world most cost effective PHI certified passive timber window. Window has very nice outlook due to aligned frame and casement which is represented by letters L (Line) and X (Xclusive).


  • aligned casement and frame on both inner and outer window faces
  • thickness of both window casement and frame is 110 mm
  • hiddenhinges
  • produced with the newest computer controlled technology implemented in 2014



  • contemporary design
  • suitable for low-energy and passive buildings
  • warm feeling
  • excellentwater- and airtightness
  • longlifespan


Technical execution:

·         Building depth 110 mm (116 mm)

·         4-ply laminated scantlings

·         3-layer Ug: 0,5 Wm²K glass (standard) best Value Uw: 0,71

·         Transparent Silicon

·         Water runoff on the wing and on the stile too

·         3-layer sealing

·         hidden hinges

·         Standard security hinges

·         Secustik security handle

·         Standard F9 Brest titanium handle

·         In many standard and RAL colour

Optional accessory for NaturaOptimo XL

·         security hinges

·         alerting sensor

·         extra glasses

·         and many other accessories available

ENERGIE FENSTER PollyNatura Optimo XLwoodenwindows

Leave a comment