There are two types of industrial blowers – centrifugal blower and positive-displacement blower and both serve for different applications.
Centrifugal blowers or fans(also known as “พัดลมหรือพัดลมแบบแรงเหวี่ยง” in the thai language) typically function against pressures of 0.35 to 0.70 kg/cm2 but are known to achieve much higher pressures. While Positive-displacement blowers or PD blowers provide a constant volume of air even if the system pressure is different.
The impeller in the centrifugal fan is normally gear-driven and rotates 15,000 rpm fast. Centrifugal Blower carries one of seven types of wheels that pull the air into the inlet of the blower housing.
Image Source: Google
On the other hand, PD blowers have rotors that “trap” air and push it through the housing. Most of the time it is seen that people mix fans with blowers but that is not right as both are different and both have different applications to serve.
A centrifugal blower is a handy device when it comes to generating a significant amount of air with minimal motion in a limited space. That is why they are mostly used in air conditioning, ventilation, heating, and vacuum cleaners rather than PD blowers.
These blowers inhale the air and direct it through a 90° angle opening in the housing to keep the air clean and cool. Thus blowers are necessary for various industrial places as well as in home and small shops too.
They are very useful but you need to be very careful about their protection, protecting blowers from the heat is a must to keep it from the explosion.