Axial fans are in fact classified as mechanical fans
  • AFL EC Axial
    Fan
     are in fact classified as mechanical fans. Mechanical fans are
    defined as being machines designed to create a flow within a fluid. Air is the
    most common gas that axial fans are created to move.


    Axial fans are not good for long duct runs. Anything over 5m will seriously
    impair their ability to extract air because of the larger air pressures present
    in the duct. When installing an axial type one should also avoid bending the
    duct if possible as this will also add to the pressure in the duct. In these
    situations one should use a centrifugal fan.


    Centrifugal fans extract air at right angles to the intake of the fan, and
    spin the air outwards to the outlet by deflection and centrifugal force. The
    impeller rotates, causing air to enter the fan near the shaft and move
    perpendicularly from the shaft to the opening in the fan casing.


    A centrifugal fan produces more pressure for a given air volume, and is used
    in installations where duct run is over 5 metres. Indeed, such is their
    efficiency that some centrifugal fans.


    Centrifugal fans come in two main types: As an Inline duct fan or as a wall
    mounted fan. The wall mounted centrifugal fan looks just like a standard axial
    fan. Since the impellar is hidden by the front grille and casing it can be hard
    to differentiate the two but the price will usually give it away: Centrifugal
    wall fans are usually more expensive than axial fans.


    Wall mounted centrifugal fans are often see in rooms which do not have
    exterior walls. Such rooms do not have windows or any natural ventilation and
    these circumstances usually require a long duct run to reach the outside of the
    building. The most common problem when air is not being extracted properly is
    when an axial fan is installed in this type of room... They are simply not
    designed for this operation.


    You will find these units in industrial applications as well as in
    residential ones. The world relies heavily on these items to do the normal day
    to day activities of living. Without them we would have difficulties getting to
    work, controlling the temperature in our homes, and even doing things like
    playing our video games. EC Fan: http://www.afl-fan.com/product/

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