Products marked with the DVV label are produced under the regulations in the Technical Requirements for DVV.
Companies producing DVV-labelled windows and exterior doors are submitted external control from a certification body.
Read or download Technichal Requirements in english here:
TR for DVV 8th Edition, Rev. 8
Read or download the Annex 21 here:
Annex 21 - Glazing unit manufacturer - Warranty
Link to the Technical Requirements in danish here.