Abstract: A fan device includes a primary blade unit, a guiding member, and a secondary blade unit. The primary blade unit includes a mounting seat having a plurality of flow channels, and a primary blade rotatably mounted in the mounting seat and having a plurality of ventilating holes that are movable to align with the flow channels. The guiding member has a plurality of flow guiding ducts aligning with the flow channels. The guiding member has a flow guiding surface. The secondary blade unit includes a plurality of mounting plates having a vent hole for mounting a plurality of secondary blades. Thus, when the ambient air flow is introduced into the fan device, the primary blade unit and the secondary blade unit guide and inject the air flow in two different directions to diffuse and spread the air flow.

Abstract: A combination fan includes an inner impeller unit, an outer impeller unit and a driving unit. The inner impeller unit is rotated by the driving unit and includes a rotation member, a ring-shaped member and a plurality of inner blades. The outer impeller unit is rotatable in concert with the inner impeller unit and includes a connecting member, an outer wall and a plurality of outer blades. The driving unit includes a propeller shaft connected with the rotation member to rotate the inner impeller unit, and a drive mechanism connected with the propeller shaft to rotate the propeller shaft. Thus, the inner impeller unit and the outer impeller unit are rotated by the driving unit to guide an air flow in different directions simultaneously.