Check out Axial Flow Fan 3D model on CGTrader for $12. High-quality mesh by tomb3d: 4573 polys, 4712 vertices.
OBJ (OBJ, filesize: 93.5 KB), MAX (Autodesk 3ds Max, filesize: 1.01 MB), DXF (DXF, filesize: 190 KB), FBX (Autodesk FBX, filesize: 116 KB), 3DS (3D Studio, filesize: 44.1 KB)