The most important size of blower wheel:
- The diameter or outside diameter
- The overall width
- The hub bore （or mounting shaft diameter）
To measure a blower wheel, you need to determine its key dimensions and characteristics, such as diameter, width, bore size, rotation direction, and the number of blades. Here is a step-by-step guide to help you measure a blower wheel:
#1 Measure the diameter: Measure the outer diameter of the blower wheel. This Outside Diameter is the length of the straight line
passing from side to side through the axis or center of the blower wheel, to the furthest outer edges of the blower wheel
#2 Measure the width: The wheel overall width is normally described as the outside-to-outside width dimension of the air-moving section of the blower wheel. Determine the width of the blower wheel by measuring the distance between the two faces of the wheel (the front and back surfaces) You may need to remove the blower wheel from the motor or housing to access this measurement.
3# Measure the bore size: The bore size refers to the hole in the center of the blower wheel that mounts onto the motor shaft. Use a caliper or a ruler to measure the inside diameter of the bore.
4# Determine the rotation direction: Look at the orientation of the blades on the blower wheel. They will either curve clockwise (CW) or counterclockwise (CCW) when looking at the wheel from the front (the side where the air is drawn in). Note the rotation direction as either CW or CCW.
Keep in mind that blower wheels come in various materials, including plastic, aluminum, and steel. The material may affect performance and durability, so it’s essential to consider this when selecting a replacement or new blower wheel.