An electric fan includes a stationary assembly and a rotor (40) being
rotatable with respect to the stationary assembly. The stationary
assembly includes a support member (16) located at a center portion
thereof, and a stator (20) mounted around the support member. The rotor
includes a blade set (41) having a rotary shaft (412) extending from the
blade set toward the stationary assembly and pivotably supported by the
support member. A rail assembly consisting of a lower rail (18) and an
upper rail (49) is attached to the stationary assembly and the blade set
to movably support the rotor on the stationary assembly.