DS EN 12412-4:2003 Thermal Performance Of Windows, Doors And Shutters - Determination Of Thermal Transmittance By Hot Box Method - Part 4: Roller Shutter Boxes Defines a method, based on EN ISO 8990 and EN ISO 12567-1, to measure the overall thermal transmittance of a roller shutter box in a hot box. It includes all effects of geometrical and material charac