propeller fan

Therefore, they are more efficient than propeller fans and can develop up to 3 to 4 in.

Propeller fans - These fans are used to move large quantities of air against very low static pressures.

The propeller fan turned faster.

The four holes in the top of the bathysphere were also equipped with shafts, each carrying one of the propeller fans.

The battery-powered P.S.A. could move in any direction using six enclosed propeller fans and have a flat-screen video panel on one side to display data.

The two large propeller fans still rotated slowly above the room, the prostitutes still mingled with the foreign journalists and Jenkins was still behind the counter.

Tube-axial fans - Tube-axial fans are similar to propeller fans except they are mounted in a tube or cylinder.

And when the self-aggrandizing owner of the local lodge installs a gigantic propeller fan as a centerpiece, a monument to electrical progress, we come to see the hubris of modern commerce hanging above the story, waiting for the current to set it spinning.