FZY series fan, what does the alphanumeric representation in the model number mean?

FZY series fans are axial flow fans. Axial fan, also known as local ventilation fan, is the same direction with the axis of the blade of the airflow (i.e., the wind flow and axis parallel), such as electric fans, air conditioning fan is the axial flow way to run the fan, is commonly used in industrial and mining enterprises, a fan.