It's been a long time since I installed the fan, and although it doesn't say so
specifically, the fan appears to be permanently attached to the motor
shaft. I believe that the instructions for reversing the "blades" are actually
reversing the entire fan/blade unit within the mounting bracket. This
does reverse the air flow. Looking at the blades themselves indicates that
they are indeed not flat and as someone suggested are intended to flow
only one direction which lends credence to my theory that the entire motor/fan
assembly is being reversed as a unit.
(I refuse to remove the fan in order to explore further) :)
Joe
"Stewart, Scot (GEAE)" wrote:
>
> If I follow you correctly, you still believe that just reversing the fan
> blades will switch the air direction. That's not true, the blade gets
> switched by the instructions because the motor gets physically turned around
> when mounting in front of the fan to keep the fan in the best direction for
> efficient airflow. Think of it this way, left hand vs. right hand screw
> threads and what direction, no matter which end of the screw you are on to
> tighten a bolt. What fan blades are used is a function of motor rotation
> direction. Sucker vs. blower is what side of the radiator the fan is
> mounted on, not rotation. Flipping fan blades front to back only changes
> efficiency, not direction.
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