# E-ref calculation for windows and facades

The Ew is a special value which is required in Denmark for classifying the energy balance of windows and French windows. With the E-ref module from Infissoft, you are able to perform a detailed U-value, Gw and Ew calculation from the Klaes software. The external tool can be called up via the quantity list printout and can be individually configured for the needs of the end customer. A modern report generator allows the rapid creation of user-defined forms according to the WYSIWYG principle.

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Here is a sample printout:

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