Question :
"How to read the FERGAS product descriptions?"

"How do I tell the rotation on a FERGAS cross flow?"

By viewing the pin end of the wheel.

"How do I tell the rotation of a FERGAS radial wheel?"

By viewing the inlet side of the fan wheel.

"What does the FER motor number stands for?"

The FER number is an internal code for different shaded pole motor sizes.
They can be translated in to the aproximate stacksize of the motor lamination:

FER22: 8-15 mm. stack size
FER12: 15 mm. stack size
FER10: 20 mm. stack size
FER16: 25 mm. stack size
FER24: 30 mm. stack size
FER30: 38 mm. stack size