- Simple gravity principle, in which a carrier only drops down due to its own weight and is transported upwards by means of pressure or suction.
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- Two-point-connection with slide-station at blower side and open end. The tube at the open end can approach from above, below or horizontally.
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- Two-point-connection with slide-stations at blower side and the opposite end. Tube is installed between two buildings as an open air line. To prevent condensation, both system ends have to be equipped with fresh-air-connection.
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