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S440 is a sliding lift system with a thermal barrier, which combines modern design with maximum thermal insulation capacity, being easy to use. Heel depth 40 / 70.5 mm Sash depth 44 mm Polyamide bar length 40 / 32 mm Maximum glazing depth 32 mm Maximum sash weight 180 kg Opening possibilities Slide of 2, 3, 4 and 6 sheets System with 2 or 3 tracks Possibility of a single running path (sheet + fixed) Coeficient de transfer termic Uf de la 1,5 (W/m²K) Izolare acustica maxima Rw = 28 dB Permeabilitate la aer CLASA 3 Etanseitate la apa 6A