International Windows Network


The International Window Network (Internationale Fensternetzwerk or IFN) is the leading European corporate group for all-round window solutions. IFN is made up of multiple companies, each of which with their own, specialised skills. Close collaboration between these specialists has resulted in innovative solutions for our customers. A pleasant living environment, attractive design, energy efficiency and ecology, integrated ventilation, intelligent solar shading, safety and much more – IFN's all-round solutions offer a new dimension of living comfort and functionality.

IFN – a network of strong partners for intelligent and sustainable buildings of the future!

Internorm International GmbH

Internorm is Europe’s leading window brand and over the last 92 years, it has been offering pioneering solutions for windows and doors with top product and service skills. The product range includes windows made of UPVC, UPVC/aluminium and timber/ aluminium as well as entrance doors made of aluminium and timber/aluminium. The Internorm product range is extended by lift and slide doors, balcony and side entrance doors, sun and insect protection as well as various accessories. Internorm sells its products through a network of 1,300 selected sales partners in 21 European countries.

Topic GmbH

Topic is the Austrian specialist for entrance doors. Topic entrance doors are premium products, boasting the highest processing quality, top safety engineering, outstanding thermal insulation features and individual design options. Distribution is carried out via trade partners.


GIG is the international contact for creating building façades. GIG achieves this by concentrating on highly individual customer wishes, architectural trends and holistic customer care. As a specialist for international project handling, GIG distinguishes itself in those projects that require complex new development including testing, sampling and prototype construction.

HSF s.r.o.

HSF offers its customers from trade UPVC and aluminium building components at an outstanding price-performance ratio. In addition to windows and doors made of UPVC and aluminium, the company also manufactures special products such as fire and smoke protection systems, lifting and sliding elements, and portals.

Schlotterer Sonnenschutz Systeme GmbH

Schlotterer is the Austrian market leader for roller shutters, Venetian blinds, window shutters and insect screens. Under the motto "Schlotterer guides light and shade", Schlotterer continues to develop sun and insect protection.

Kastrup Vinduet Holding ApS

Kastrup is the fourth-largest manufacturer of windows and doors made of timber, timber/aluminium and UPVC in Denmark. The products are perfectly attuned to the northern European market and are used both in new construction as well as in renovation.


Skaala, with its innovative, highly energy efficient window and door solutions, is a market leader in Finland. With a branch in St. Petersburg, Skaala is also working on the Russian market.

Skaala / Vinduesgrossisten

Skanva is a Danish specialist for online sales of windows in Denmark, Norway and Iceland with the two brands Vinduesgrossisten and Skanva.


Neuffer ist mit sechs Online-Shops –,,,, und – sowie mehr als 6 Mio. Websitebesuchern im Jahr die führende Online-Marke im Bereich Fenster und Türen in Europa.