The main difference between a blower and a fan is that a fan has an open design that circulates air around an entire space, while a blower?s design focuses air on a given area. Also, a fan moves air using pitched blades, while a blower uses a rotating blade wheel.
Technically, both are fans. What is commonly referred to as a blower is actually a centrifugal fan, and what most people think of as a fan is an axial fan. A blower is able to use higher pressure compared to an axial fan due to the design of its casing.
The blower brings air in through an inlet. The air fills a central area where centrifugal force pressurizes it. The air is then thrown into the blower?s housing and expelled. The direction in which it exits is at a right angle to the direction in which it enters.
The direction of an axial fan?s airflow is linear, with the air passing straight through. Many have an orifice that helps move the air at a higher velocity and aim it in the desired direction rather than off the sides of the blades.
Axial fans are used in a wide variety of applications, from small electronics to giant wind tunnels. Centrifugal fans are generally used for jobs that require lower flow rates at higher resistance levels.