This part of ISO 12567 specifies a method to measure the thermal transmittance of a door or window system. This includes all effects of frames, sashes, shutters, blinds, screens, panels, door leaves and fittings.It does not include:. edge effects occurring outside the perimeter of the specimen;. energy transfer due to solar radiation on the specimen;. effects of air leakage through the specimen;. roof windows and projecting products, where the external face projects beyond the cold side roof surface.NOTE For roof windows and projecting units, the procedure given in ISO 12567-2:2004 should be used.Annex A gives methods for the calculation of environmental te