Research was conducted in laboratory conditions on the pressure losses in film hoses made of pure polyester polyurethane with high flexibility and compressibility reinforced with a spring steel spiral. The measurements were conducted with use of 3-meter long sections, which were 80, 100, 150 and 200 mm in diameter. A mixture of sawdust, shavings and dust from working of softwood with the mass concentration in the carrying stream at the level 100 g·m^-3 was used. Velocities of air flow were changed in the range from 10 to 25 m·s^-1. The resistance of clean air flow was also determined.

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