|The rotational direction is defined looking at the suction side of the fan.|
|Wheel turns clockwise||Wheel turns anticlockwise|
There are 2 types of fan base.
Fan base: For small motor sizes.
In the case of motor sizes smaller than 90 or less than 1.5 kW, the fans generally have an attached base.
Motor base: As a rule, for larger motors as of size 90 or a power above 1.5 kW.
The data sheet of the fan indicates whether the fan has a fan base or motor base.