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An Introduction to Inline Duct Extractor FansInline duct fans, a type of extractor fan, can also be known as duct fans, tube fans, hydroponics fans, air boosters or ducted fans.Inline duct fans are primarily used to increase the air flow in a heating, ventilation or air conditioning duct - FanBuyer's Inline Fans range from 100mm to 315mm in diameter. Duct fans are ideal for air extraction from small rooms / workshops / laboratories. They are also used to boost air in greenhouses, hydroponic gardens and other places. The rate of airflow (the output of an inline duct fan, or the amount of air it moves) is measured in CFM (cubic feet per minute) in the US and M3/h (cubic metres per hour) in Europe and the UK. You will find that all FanBuyer in-line fans are provided with a Max Airflow figure in M3/h.  When comparing manufacturers, it is worth noting that a duct fan with a higher M3/h does not always mean it is a more powerful fan as the rated airflow is given at its maximum. Maximum airflow is obtained when the fan is free blowing, ie not connected to any box, duct, filter, etc. Obviously, this is a scenario that rarely happens! As soon as the fan is plugged to a duct, or a system, it operates against pressure. You can download the specifications for all Fanbuyer duct fans as a PDF document (see the icon underneath the 3D image) which includes: * the supply voltage and frequency * the power consumption (Watts) the maximum current (Amps) * the speed in rpm * the max airflow in M3/h * the maximum operating air temperature * the weight in Kg Also included in the PDF Specification Sheet is a graph which illustrated the expected airflow in m3/h at a given static pressure in Pascals (Pa). The pressure of any given system (namely the installation of the fan / ducting and the environment) can be estimated but very difficult to measure. In most instances (for example small growing rooms) this is usually not necessary. For more advanced commercial and industrial applications it is advisable to calculate the pressure of the proposed system as a larger more powerful fan may be required. In order to obtain the best airflow out of your system, ensure that any duct fitted to the fan has no unnecessary bends (avoid making the flexible duct look like a snake for example - try to have it as straight as possible. Avoid having any unnecessary obstruction to the fan. If you use a filter, make sure it is kept clean. A number of accessories are available, including speed regulators, filter boxes and back draught dampers - all these and more can be found in our inline fan accessories section. |
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| This article was published on Thursday 03 February, 2011. | ||
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