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Thermal efficiency

Passivhaus logoCertified by the German Passivhaus Institut, Alphawin windows & doors offer high thermal performance. Alphawin has a  whole window Uw value of 0.68 W/m2K. Optiwin uses wood fibre to insulate the timber frame, helping to minimise 'thermal bridging' through the windows and doors.

Thermal insulation

Window U value, Uw = 0.68 W/m2K


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