What direction is the airflow of my blower?
Different combinations of shaft orientation and direction of rotation can change the direction of airflow.
To determine the shaft orientation of your blower, look at the blower from the drive end where the drive shaft protrudes from the main body. If you need further assistance with deciding the orientation of your blower, check out this post which has some photo examples.
Vertical Airflow: Right Hand Shaft: Clockwise Rotation: Top Inlet