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A fan is a powered machine used to create a flow of air. A fan consists of a rotating arrangement of vanes or blades, generally made of wood, plastic, or metal, which act on the air. The rotating assembly of blades and hub is known as an impeller, rotor, or runner. Usually, it is contained within some form of housing, or case. This may direct the airflow, or increase safety by preventing objects from contacting the fan blades. Most fans are powered by electric motors, but other sources of power may be used, including hydraulic motors, handcranks, and internal combustion engines.
Mechanically, a fan can be any revolving vane, or vanes used for producing currents of air. Fans produce air flows with high volume and low pressure (although higher than ambient pressure), as opposed to compressors which produce high pressures at a comparatively low volume. A fan blade will often rotate when exposed to an air-fluid stream, and devices that take advantage of this, such as anemometers and wind turbines, often have designs similar to that of a fan.
Typical applications include climate control and personal thermal comfort (e.g., an electric table or floor fan), vehicle engine cooling systems (e.g., in front of a radiator), machinery cooling systems (e.g., inside computers and audio power amplifiers), ventilation, fume extraction, winnowing (e.g., separating chaff of cereal grains), removing dust (e.g. sucking as in a vacuum cleaner), drying (usually in combination with a heat source) and providing draft for a fire. Fans also have several applications in the industries. Some fans directly cool the machine and process, and may be indirectly used for cooling in the case of industrial heat exchangers.
While fans are often used to cool people, they do not cool air (electric fans may warm it slightly due to the heat produced by their motors), but work by evaporative cooling of sweat and increased heat convection into the surrounding air, due to the airflow from the fans. Thus, fans may become ineffective at cooling the body if the surrounding air is near body temperature and contains high humidity.

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  1. A

    Ducting for kitchen extractor fan

    We moved into a house with a gas Aga (I think converted from oil). The extraction pipe is fitted against and runs through an external wall, then up the outside of the external wall. The ducting pipe circumference is about 32cm, so about 10cm diameter. There is no extractor fan in the kitchen. We...
  2. C

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  3. G

    Ikon 40-50 Boiler - Cuttting out after fan fires.

    I'm hoping someone can give me some advice, I'm working with an old Ikon 40-50 Cl boiler, and when turned on the fan seems to fire for a second and then cuts out, currently, the boiler does not reach the stage for the ignitor. I've checked the jet for blockages, the ignition isn't shorting etc...
  4. E

    Odd Vitodens 200W Combi symptoms, fan spins up 100%, even in standby

    Conditions: nearly 10 year old boiler WB2B, heating mode off, DHW on or also in standby, Boiler shows no fault LED on, no new fault logged, room thermostat deactivated. Boiler gets odd attacks of suddenly turning on the fan 100%, then (gas valve and ignition are clicking?) potentially tries to...
  5. S

    Unvented extractor fan for gas cooker

    Hi guys I'm moving to a flat but where the cooker is situated. I can't get a vented extractor fan as it's the same wall as the next door flat. Are the none vented ones any good ? Which one should I be looking out for ? Or avoid ? Any tips will be helpful
  6. Desktop987456

    Fan assist coil unit

    I have one of the attached heating coil unit (fan assisted) installed in my lounge. The Lounge is about 650sq.ft so instead of radiator we installed one of these. It works quite well, the unit's is one of the last in circuit and its valves are fully open, there's no thermostat installed with...
  7. E

    URGENT Rayburn 480K B serial no R0073699 need part number R3781 - Air Fan.

    I have a Rayburn 480K B serial no R0073699 and desperately trying to get part number R3781 - Air Fan. Waited 9 months for Rayburn to get back with availability.
  8. M

    Worcester 28i junior fan running

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  9. T

    Why are fan convectors meant to be on Constant Temperature circuits?

    Why are fan convectors meant to be on Constant Temperature circuits? I originally thought that it was because they aren't suitable for lower temperatures, but I recently found that no to be true since you can use them at 55/44 flow and return temperatures (Oversized). Radiators go on variable...
  10. C

    Set fan operation switch

    Hi, here is my question: my house 's central air conditioner has gas Heater and electric A/C, which fan operation I should switch in the thermostat? gas or electric? here are the manual instructions: Set Fan Operation Switch, Move the switch to the proper setting: - Gas or Oil: For gas or oil...
  11. Q

    Allowed work on extract fan?

    Hi, I have a question regarding a disagreement i'm having at work. We recently had a tray-washing tunnel machine with a gas-burner break down due to the burner extract fan being flooded as the submerged heat pipe cracked. The fan was removed and sent away, came back today to be fitted. My...
  12. C

    Valor Turbochim Side Flue 517SF Wont Start Fan

    Hi All I have a Turbochim side flue fire, installed Dec 2000 and has worked well for 20 years. It would not turn On the other day. Normally you press and hold On button and the fan starts. Now when you press the ON button you here a click and the fan fails to start. The fan has been tested (...
  13. K

    Thorn 25/30 ah fan problem

    I have been asked this one by a customer and am not sure as it’s a old boiler I no nothing about how it’s meant to run. So the time clock packed up so I replaced it and all was well but now the customer is telling me that the fan runs all the time, even when the stat has cut the burner. Is...
  14. S

    vaillant replacement fan use only on Italian appliance

    hello I've picked up a replacement fan for a valiant turbomax 242 and when I got it home it has a warning notice say use on Italian appliances only, but this one was made in Germany. Anyone come across this?
  15. A

    Replacement Manrose 100mm Bathroom Extractor Fan

    The motor winding on my Manrose 100 mm Timer Chrome LP100STC 12473 has failed due to ingress of debris into the ducting jamming the fan. It was purchased about 6 years ago. I didn't particularly want a timer model, and consequently now want to fit a standard replacement, preferably one that will...
  16. H

    Called out to fault on Alpha HE 33. New Fan Installed.

    Hi guys. First post on here. Called out to fault on Alpha HE 33. Fast blow fuse found to have blown. Faulty fan found to be problem. New fan installed and tested. Four days later and a call from customer to say boiler not working again. fast blow fuse found to have gone again. Replaced and gone...
  17. R

    Kick board fan assisted heat exchanger ?

    Removing 4ft radiator in kitchen and looking at installing one of those under unit heat exchangers due to having no wall space in new kichen, what size and model to go for.
  18. D

    Worcester Negative Fan Pressure decrease after cleaning heat exchanger

    Hi, I am new gas safe registered. I serviced a old worcester R28 HE Z7-28 system Boiler. found negative fan pressure -3.95mb lower than MI's -4.2mb, Gas rate is 2.82 m3/h, little bit lower than MI'S 2.9M3/H, so clean heat exchanger very well. after that check fan negative pressure, -3.11mb...
  19. J

    Extractor fan for oven?

    I don't know if plumbing include extractor fans, but I was hoping that you could point me in the right direction as to whether self enclose ovens existed so that all of their smoke was funnelled outside, like an top extractor fan, only for oven as they smoke the house out. Thanks!
  20. M

    Worcester fan replaced, pressure now dropped / air in pipes / constant need to top up

    Hi, We recently had a Worcester compact system boiler repaired under warranty where the fan had failed. Since this has happened, the top floor radiator has needed bleeding constantly and additional water added to the heating loop. There's no apparent leak. I'm guessing the boiler is releasing...
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