There are several air moving device, those are: fan, blower, and compressor. All of their function is similar, that is to create air flow. Some expert classified them based on their pressure. Fan is the lowest, less than 1000mmAq. Second is blower, 1000-10000mmAq. The highest is compressor, more than 10000mmAq.
Fan is used at many kind of the equipments, especially cooling system equipments. For example, air conditioner, cooling system in electronics, or even just fan for summer. All of them are used to enhance heat transfer from the object to the ambient.
Based on the air flow direction, fan can be divided into two types, centrifugal and axial fan. In centrifugal fans, air comes from the axes direction of rotation and exhaust at periphery. In axial fan, air comes from behind and exhaust to the front.
There are three kinds of centrifugal fan. First is sirocco fan, this fan has forward curved blade, low RPM, Low noise, Low static pressure, and well suited for residential HVAC application. Second is air foil fan, this fan has backward curved blade, high RPM, Low noise, and usually used for clean environment. Third is turbo fan, this fan has backward curved blade, high RPM low noise, high static pressure, and high efficiency.
There are also three kinds of axial fan. First is propeller fan, this fan has propeller only, large flow rate, low static pressure, low efficiency. Second is tube axial fan, it is similar with propeller fan but improved by casing, higher total pressure capability than propeller fan. Third is vane axial fan, this fan same with tube axial fan but have vanes to straighten, this fan has high efficiency.
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