An axial flow fan is a mechanical device that produces a flow of air or gas. These are used to move air and gasses through ventilation systems. Serving a variety of industrial needs, fans force air through steam boilers and lowering the operating temperature of electronics and machinery. In contrast to the compressors, fans operate at relatively low pressure. These are classified as centrifugal or axial. Centrifugal fans are the traditional forms that are used mainly for ventilation, such as ceiling-mounted fans. The air is moving perpendicular to the impeller shaft. There are three general types of centrifugal blades, namely: radial, curved forward and backward curved. These produce more pressure for a given air volume and is used for hair dryers, inflatable objects, and other similar industrial purposes.
On the other axial flow fans are used for small fans for electronic gadgets, large fans used wind tunnel and various other applications. However, you familiar with this, because they are typically used for an ordinary table fan. The blades of this type of force air to move parallel to the axis of rotation. These fan blades may be planar or curved plates or are formed with cross-sections related to airfoils that provide lift wing of an aircraft. There are three categories, namely, the propeller, pipe, and vane. The propeller is used for large volumes of air pushing against a low or no static pressure. Meanwhile, baths are those of which the propellers are encapsulated in a channel section. On the other hand, vane converts circular, rotating air movement in the longitudinal direction, vertical movement. Vane is considered to be the most efficient fans for HVAC systems.
Most average fans of this type have a flow rate of approximately 75 m3 / hr (meters cubed per hour), which accounts for most small bathrooms with a short run of the duct through the wall, no more than one meter. There are some that up to 97m3 / h and pull can be guided to 5m, but axial fans work best in shorter channel run. The design axial fans cannot handle long runs product if they do not have the necessary pressure to press a large distance the air and reach a stall condition where the air stops moving in the channel.
Finally, when choosing industrial exhaust fans, most companies will purchase an axial flow fan, but some will prefer the wall fans also known as the panel like fans.