Windows and functional doors must be serviced regularly to ensure their durability.
As a producer of fire-rated windows and fire protection doors, we provide samples which you are welcome to use for your own purposes. We have written an article on this topic for the B:Spezial issue 10/2020. The documents can be downloaded from our website or from the website of Bau- und Möbelschreiner at www.bm-online.de/wissen/bauelemente/samples-for-support/.