ift Evidence of Performance of U_f -calculations by manufacturer

The construction product “window” is subject to conformity system 3 of the product standard EN 14351-1. As part of the type testing the evidence of the thermal transmittance U_w as well as the necessary thermal technical input data, for example the frame profile, is carried out by a notified body.

The manufacturer may, however, independently determine properties whose determination is the task of a notified body, by means of tabulated values or calculations. The basis for the determination of the characteristics, however, needs to be verified by a notified body.

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For questions and technical difficulties, please contact our  iftFEM-Team.