ÖNORM EN 410

This European Standard specifies methods of determining the luminous and solar characteristics of glazing in buildings. These characteristic can sewe as a basis for lighting, heating and cooling calculations of rooms and permit comparison between different types of glazing. This European Standard applies both to conventional glazing and to absorbing or reflecting solarcontrol glazing, used as vertical or horizontal glazed apertures. The appropriate formulae for single, double and triple glazing are given. This European Standard is accordingly applicable to all transparent materials except those which show significant transmission in the wavelength region (5 to 50) prn of ambient temperature radiation, such as certain plastic materiais. Materials with light-scattering properties for incident radiation are dealt with as conventional transparent rnaterials subject to certain conditions (see 4.2).