Jane-DoH:
Then how come the fans on jet-engines don't cause significant amounts of torque?
The torque resulting in a prop aircraft is because the slipstream leaving the plane of the prop is rotating - a vortex, the result of the action of the blades' airfoils. The air is accelerated both aft and in the direction of prop rotation. This vortex represents lost propulsion energy.
The fan module of a turbofan includes both the rotating airfoils AND a stage of stator airfoils. These stators capture the vortex, and straighten the flow so it is directed straight aft. Since the flow passage between adjacent vanes is divergent - a diffuser - the flow is slowed, and static pressure is increased.
And since the flow leaves in a straight, non-vortex manner, there is no torque to be reacted by the airplane.