1) The document provides tables of reference values for various thermal properties such as conductivity, transmittance, and resistance for common building materials like wood, metal, glass. 2) It discusses European Directive 2002/91 requiring thermal transmittance (U-value) limits for windows based on climate zone to reduce heat loss. Tables list maximum U-value limits. 3) Equations are provided to calculate the total thermal transmittance (Uw) of a window based on the transmittance of individual frame, glass, and spacer components. Parameters to consider in the calculation are defined.

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