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Fenestra Fenix Patio is a single sash wood-aluminium sliding patio door: The external frame and door leaf are aluminium clad. The patio door comes in a wide range of colours and varnishes.
Heat retention (assumed):
U-value with standard glass is 0.83
U-value with special glass is 0.79
Sound insulation (assumed):
Rw = 33-41 dB