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The folding doors 50 and 50E are thermally separated, with particularly slim profiles and a silent, dynamic drive system. Both versions are particularly suitable where space is restricted. Maximum heights of up to 2.5 metres are possible. The folding doors avail of highly efficient thermal separation with very good thermal transmittance values (UD values) ranging from 1.7 to max. 2.4 (thermal coefficient) which can be calculated individually for each door system. In combination with ISO glass, the folding doors ensure good thermal insulation of external doors.