An agricultural fan, such as a ventilating fan, a blowing fan, and a stirring fan, is provided to remove a need of setting a center of an impeller, to assemble components at a supplying or installing place, to simplify the working procedure, to reduce exhaust gas generated in transportation and protect environment, to receive the fan in an approximately equilateral triangle box pack, to thereby increase the number of loads, and to reduce the transferring cost. A ventilation fan(1) comprises a rim body(2) made of a pipe material; plural supporting bodies(4) formed approximately like an equilateral triangle and assembled as a pipe material with the rim body; a driving unit(5) supporting a receiving unit of the plural supporting bodies; the rim body installed on a shaft of the driving unit; and an impeller(7) disposed in the supporting bodies. The supporting body has a base unit formed with a recessed unit on the bottom edge of the equilateral triangle; a curved middle unit elongated from the base unit on the lateral edge; and a supporting front end unit installed on the distal end of the curved middle unit to have the receiving unit. Plural recessed units on the rim body are formed at the opposite side of the recessed unit of the base unit of the supporting body. A mounting member(3) is formed with protrusions fitted into the recessed units to fix the plural supporting bodies with the rim body and to support the supporting front end unit by a casing of the driving unit.
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