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Types of glazing and their specific values

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first oil crisis. There is a layer of insulating air between the two panes. * The thermal transmittance coefficient is reduced by the air layer to about **2.8 W/(m²K)**, which means that ... which has a lower heat conductivity than ordinary air. Thus this so called "heat protection glazing" or... emperatures (-15°C). However, there is still cold air descent ocurring at the window and uncomfortable