FIELD: fan engineering. SUBSTANCE: side walls 2 and shell 1 are made in block from a single blank. The developments of side walls 2 are arranged along the development of shell 1 from both its sides. Corrugations 4 are then made on the developments of side walls 2. The developments of the side walls are bent to obtain [- shaped chute. The chute is flanged to define shell 1 and side walls 2 with uniformly arranged stiffening ribs 3. EFFECT: simplified method. 5 cl, dwg
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