Fenestra IOSU is a twin leaf balcony door that opens inward and outward with an internal sash with a triple glazed assembly. The Fenestra IOSU balcony door external sash is made from aluminium and the frame is aluminium clad. Different appearances are possible: as standard full glass and on special order with spacer or partially closed panels.
Heat retention (assumed):
U-value 1.0
Sound insulation (assumed):
Rw = 42-47 dB, Ctr = 35-45 dB
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