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Streamlines at the position b/4 of four models (Re > 6,000). 1 1/30 model, Re = 8,500, 1/40 model, Re = 6,000; 2, 3 1/10 and 1/20 models, Re = 6,800–20,000; 4 1/40 model, Re = 5,000 and height of return air grille = b/13; 5 theoretical streamline; 6 1/10 model, Re < 2,000
