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 temperatures.