How do you determine blower rotation?

To determine blower rotation, first identify the blower's design specifications, which typically indicate the direction of airflow. If the specifications are unavailable, you can observe the impeller blades: they should curve in the direction of rotation. Additionally, you can use a simple method by placing a piece of lightweight material (like a tissue) near the outlet; it will be blown away in the direction of the airflow. Finally, always ensure the blower is powered off before checking to avoid injury.