The axial flow, centrifugal and cross flow are the three most common types of fans whereas blowers are only of two types, the centrifugal blower, and the positive displacement blower.
The fan consists of motor blades whereas a blower consists of a housing casing with a fan.
There are more differences between a fan and a blower, for example, a blower generally has a very specific usability spectrum. Blowers have a good acceptability in fields of applications where a concentrated beam and consistent air flow is desired. Like in a furnace or certain type of blowtorch applications the blower would be the preferred source of air. Blowers are also good companions for kitchen ovens and grills where continuous air supply is required for proper combustion of fuel.
On the other hand……