It has blades. They are buried in the round base of the fan.
The airflow from those blades is ducted up around the inside surface of the airfoil shaped ring, and it draws in air and accelerates it out through the gap around the inside of the ring, which picks up the rest of the air it moves.
Seen similar used to ventilate fuel cells on aircraft, for maintenance work. Moves lots of air, but uses an outside air source to make it work.
No free lunch.
Cheers
Trev