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Fenestra Primus Plano is a pivoting openable wood-aluminium window with the external sash using glazing thicker than 6 mm for achieving better sound insulation.
U-value of standard glass is 1.0
U-value of special glass is to 0.79 (VT estimated, measurements 1230x1480)
Rw = 42-50 dB, Ctr = 35-47 dB