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Fenestra Fenix Fixed is a closed, single sash triple glazed assembly wood-aluminium window with the external sash and frame having aluminium cladding. Can be used with openable windows within the same frame as they are identical in appearance. Closed windows have the advantage of permitting building large size windows.
U-value with standard glass 0.83
U-value with special glass 0.79 (VTT estimated, measurement 1230x1480)
Standard glass Rw = 33 dB
Special glass up to Rw = 41 dB