Vapor barrier for a Garnveredelungsanlage

The invention relates to a vapor barrier (1) for a Garnveredelungsanlage (8) which operates according to the power-heat-set method and with conveyor belts (2) is operated. The openings for the entry and outfeed of the textile yarn (6) into the treatment space (9) of the Garnveredelungsanlage (8) are largely closed to prevent steam escape from the treatment chamber (9).