The blower normally refers back to the usually used centrifugal fan, which belongs to the rectangular torque load. Compared with the above devices, it has the bottom exhaust pressure, however the identical strength has the biggest exhaust volume. It is used for air flow and warmth trade. The blower of the boiler, the precipitated draft fan, the warmth trade withinside the tunnel furnace, and the constructing exhaust also are used The classifiers utilized in stone powder factories, chemical factories, dyestuff factories and flour generators are extensively used.