ISO 15099:2003规定了基于最新算法和方法确定窗和门系统的热和光传输特性(例如，热透射率、总太阳能透射率)以及所有部件的相关太阳能和热特性的详细计算程序。 ISO 15099:2003涵盖的产品包括门窗，包括: 带或不带太阳反射、低辐射涂层和悬浮塑料薄膜的单层和多层玻璃开窗产品；含有气体或气体混合物的具有任何宽度窗格间距的玻璃窗系统；金属或非金属间隔物；任何材料和设计的框架；以任何角度倾斜的开窗产品；遮阳装置；投影产品。

ISO 15099:2003 specifies detailed calculation procedures for determining the thermal and optical transmission properties (e.g., thermal transmittance, total solar energy transmittance) of window and door systems based on the most up-to-date algorithms and methods, and the relevant solar and thermal properties of all components. Products covered by ISO 15099:2003 include windows and doors incorporating:

1. single and multiple glazed fenestration products with or without solar reflective, low-emissivity coatings and suspended plastic films;
2. glazing systems with pane spacing of any width containing gases or mixtures of gases;
3. metallic or non-metallic spacers;
4. frames of any material and design;
5. fenestration products tilted at any angle;
6. shading devices;
7. projecting products.