Centrifugal fan
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A centrifugal fan is a mechanical device for moving air or other gases from the rotating inlet, in a direction perpendicular to the axis of rotation of the fan, to an outlet. Centrifugal fans often co
An external motor belt driven inline centrifugal fan discharging inline to the exterior of a building through a duct. Unlike non-inline/non-concentric impeller casing design with a cutoff blade above, the concentrically symmetric cylinder casing and impeller geometry of inline type redirects the outflow around so that it is parallel to the inflow of gases.
Forward-curved blades in a household fan
Pump
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A pump is a device that moves fluids, or sometimes slurries, by mechanical action, typically converted from electrical energy into hydraulic or pneumatic energy.
Centrifugal fan
…elevation above sea level, making these fans unsuitable for applications where a constant mass of air is required to be provided. Centrifugal fans are not positive-displacement devices that have certain advantages and disadvantages when contrasted with positive-displacement blowers: centrifugal fans are more efficient, whereas…
A small, electrically powered pump
A large, electrically driven pump for waterworks near the Hengsteysee, Germany
Antique "pitcher" pump (c. 1924) at the Colored School in Alapaha, Georgia, US
Screw pump