PROBLEM TO BE SOLVED: To solve a problem in conventional constitution wherein the back face of a flow straightening plate of a ventilating fan body is provided with an oil pocket of bottomed rectangular shape with a flange at the upper open end, which is intended to positively recover oil sticking to a ventilating fan provided at a part where oily smoke rises in a kitchen or the like, but limited to a small structure for home use without a function as an oil sump for factory use.;SOLUTION: This utilization structure of a circulating fan comprising the oil sump is constituted by composing the circulating fan for factory use of a wind tunnel 1 comprising the suction/discharge side, stator blades 2, a bell-mouth 3, circulating fan blades 4, a guard 5, and a frame body 6 provided at the guard and bell-mouth, providing the oil sump below the circulating fan, and providing one or more circulating fans A comprising the oil sumps in the longitudinal direction of a ridge, a beam, or the like of the factory to recover oil floating in the factory.;COPYRIGHT: (C)2007,JPO&INPIT
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