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The subjects sat frontal with their head at the free end of a glass tube (inner diameter 295 mm, length of 1347 mm) during the phonatory tasks. The suction side of a FFU that produced a horizontal volume flow of 400 m3/h on average was placed at the opposite end. To achieve a fully developed turbulent flow at the position of the LPC at 810 mm, two baffle plates at distances of 340 mm and 420 mm from the entry were applied. All length units are in mm.
