hout: file:///C:/Users/BartEllen/AppData/Local/Microsoft/Windows/INetCache/IE/GEIAW0CU/160512_AG150812%20-%20Publication%20NL%20(2016-04-25).pdf
aliminium: https://www.peetersramenendeuren.be/aluminium/
PVC: file:///C:/Users/BartEllen/AppData/Local/Microsoft/Windows/INetCache/IE/0EUY1WGG/F1021_Kunststof%20met%20Middendichting_Web.pdf
