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Most common cause of intrusion

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What's the level of light transmittance?

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What's the level of light transmittance?

It describes the percentage of sunlight, which is transmitted from outside to inside through a glass pane. A simple 4 mm glass sheet has a light transmittance of 85%. A heat-insulating glass pane (2X4 mm, 16 mm gap) with the proper K value of 1.1 lets pass at least 76% of the light.





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