Who makes commercial electric fans

Who makes commercial electric fans DEFAULT

12 best fans of 2021: The best cooling fans for your home

When shopping for fans, you’ll come across some distinct styles, each ideal for different needs:

  1. Ceiling fans are permanently installed on a room’s ceiling. They move air around, keeping rooms cooler in the summer or warmer in the winter by reversing airflow — some models also incorporate lights.
  2. Tower fans or floor fans are portable units that can be placed in different rooms and are tall, as well as narrow. “When I want a fan blowing directly on me, such as when I’m working in my shop, I opt for a floor fan,” said Schraeder.
  3. Window fans also offer localized airflow but can be inserted into certain window frames and utilize outdoor air to cool a room more so than a traditional fan would, depending on the temperature. However, these fans need to be removed when it gets cold out and can cause leaks when it rains.
  4. Table fans or desk fans are standard, personal fans that sit on a desk or table. They typically stand about 2 feet high. “This fan is great to have at eye level, can be bought at an affordable price and is a standard way of cooling you while sitting at a desk, lying in bed or even sitting on a couch,” noted Brandi Andrews, founder of National Air Warehouse.
  5. Stand-up fans, also known as pedestal fans, are similar to table fans but stand on the ground, are typically larger and can throw off more cold air while still being portable. The benefit to this fan is you can take the cool air with you from one room to the next and enjoy an ever-revolving breeze from a large fan, Andrews explained.
  6. Handheld fans will not cool as much as a table fan, but they are cordless and can be directed wherever you’d like. They fit into your hand as well as your pocket. “Take the cool air with you out of the house and on a walk,” Andrew added, “and you can purchase them for an affordable price.”

Table fans and stand-up fans are usually needed when a space doesn’t have air conditioning or a central air system. “They would go great in a home that uses only ceiling fans, has windows open often and just needs air to be circulated,” explained Schraeder. On the other hand, handheld fans are ideal for travelers, those who work outside or those who simply enjoy cool air while on the move.


Features to look for in a fan

Once you decide what type of fan you’re interested in, there are specific features the experts we consulted recommend keeping in mind.

  • Remote control. Get access to a cool breeze without having to move. “Remote controls have become a must-have for many fan buyers, no matter if it’s a ceiling fan or stand up fan,” said Andrews.
  • Smart controls. Sophisticated fans can connect to voice-activated smart devices for hands-free use as well as to your smartphone for air quality reports and additional features.
  • Filters. Fans also can come with a range of filters that help purify the air to remove allergens and improve overall quality. “If your need is in a kitchen to get rid of smoke and odors from cooking, then a fan with a HEPA filter, charcoal filter or both is something you might want to look for,” said Schraeder.
  • Oscillation. This feature allows fans to move from side to side or up and down (or both, about which there’s more below) to help circulate cool air throughout a room instead of directing it into one set spot.


Best fans to shop

To give you an idea of the broad scope of fans available now, we compiled some of the best fans out, guided by the experts we consulted.

Best tower fan: Lasko

1. Lasko Wind Curve Portable Electric 42-Inch Oscillating Tower Fan

With a slim profile, oscillation, remote control and wood-grain finish, this tower fan quietly circulates cool air in style. Not only is the price point a relatively budget-friendly alternative to AC, but at 42 inches, the high-reaching tower can circulate a refreshing breeze throughout an entire room. As you sleep, you’ll appreciate not only the ability to adjust the three speeds from a remote, but also how quiet the machine is —you don’t have to deal with noise in order to get a cool night’s sleep.

Best oscillating tabletop fan: Woozoo

2. Woozoo Remote Controlled Compact Globe Oscillating Circulating Fan

At under 4 pounds, this small-but-mighty globe fan delivers a cooling breeze from the touch of a remote control. The space-saving desk or tabletop fan is versatile with five different speeds and the option to direct airflow or oscillate not only from side to side but up and down as well, with enough configurable options to help you find the exact style of fan circulation you’re looking for at any given moment.

Best affordable air purifying fan: Blueair

3. Blueair Blue Pure Purifying Fan

Not only does this fan remove dust and pollen from the air as it delivers a soothing breeze, but it also cools across a 90-degree range without needing to oscillate. Plus, it’s portable for tabletop and floor use, has five different color filter options to give your space a personal feel and boasts three different speeds.


Best stylish fan: Vornado

4. Vornado VFAN Mini Classic Personal Vintage Air Circulator Fan

Although it depends on your preferred style and the vibe you’re going for, Andrews loves the look of Vornado's retro fans. Whether you opt for the “vintage” pedestal fan or stick to something smaller with the personal size fan, these timeless designs elevate decor instead of taking away from it. “These provide a classy, '80s look to the room and are available in different colors, but they also give a nice breeze,” she said.

Best smart fan: Dyson

5. Dyson Pure Cool DP04 Purifying Fan

This robust air purifier cleans air throughout the entire room and attacks pollutants with carbon and HEPA filters. Its LCD display shows the amount of pollutants around it in real time and this machine automatically reacts, adjusts and sends a report to your Dyson Link app. It also works with Amazon Alexa for easy voice activation — as well as with a remote — if you prefer hands-free control. “If you're in need of a fan that also purifies the air, this is the one to try,” said Prouty. “It's powerful, compact and has a ‘purify only’ mode in case you want to clean the air without being cooled off yourself.”

Best fan with built-in air purifier: Dyson

6. Dyson Pure Cool HP04 Purifying Heater + Fan

Although fans that also purify are more of an investment, Dyson has the best options and they’re worth the investment, according to Andrews. With a HEPA filter that removes 99.97 percent of allergens, this tabletop fan cools with purified air instead of recirculating pollutants. In the winter, it also serves as a space heater. It can be voice-controlled with an Amazon Alexa, and it includes options to direct airflow or oscillate up to 350 degrees. Also consider its larger cousin, the Dyson Pure Cool TP04 - HEPA Air Purifier and Tower Fan.

Best commercial-strength fan: Royal Sovereign

7. Royal Sovereign 30 Inch Commercial High Velocity Pedestal Fan

This 30-inch Royal Sovereign pedestal fan is actually a commercial model but at a price that makes it affordable for home use, said Andrews. “If you are serious about cooling your home without AC, then purchase a fan like this. It will circulate the air, throw off a really great breeze and keep doing it for hours and hours,” she noted.


Best window fan: Comfort Zone

8. Comfort Zone CZ319WT 9-inch Twin Window Fan

This twin speed window fan has two air output options, as well as a reverse airflow mode to push out stale air. “Have you ever overcooked something and the smoke or odor created is offensive?” This fan “helps with that when a hood isn’t enough,” said Schraeder, adding it’s “simple to install” and “reversible, making it perfect for a variety of applications.”

Best versatile fan: Snawowo

9. Mini Handheld Personal Portable Fan

From a stroller or car seat to a bike or desk, this adaptable tripod fan is ideal for hooking on to hard-to-reach places and for people on the go. Both a USB and battery can power this mini personal fan for up to eight hours — depending on the speed — and it has a bendable silicon tripod for extra flexibility.


Best heavy duty, affordable fan: Lasko

10. Lasko 20-Inch High Velocity QuickMount

An industrial fan that’s also budget-friendly, this high-velocity Lasko fan will impress with its cooling capabilities. Not only does it easily convert from a floor mount to a wall mount, but this fan also has three powerful speeds and a pivoting head that allows you to direct its airflow.

Best fan for the pros: Lasko

11. Lasko U12104 High Velocity Pro

For those looking for a professional-worthy fan, this pivoting utility fan cools, ventilates, dries and exhausts. Whether you’re on a job site or at home, you’ll likely find use in the high velocity air stream powered by three fans, as well as in the built-in twin 120V accessory outlets to power any additional devices.

Best desktop fan: Vornado

12. Pivot Personal Air Circulator Fan

Add a sleek touch that packs a cooling punch to your desk or tabletop with this modern desk fan. With a pivoting axis, this compact fan allows you to enjoy multi-directional airflow from three different speeds. Plus, it comes in four different contemporary color combinations, from Champagne to Rose Gold, letting you complement your aesthetic.


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Lauren Levy

Lauren Levy is a contributor with work published on The Knot, PopSugar, CafeMom, Mom.com, Bridal Guide and Care.com.

Sours: https://www.nbcnews.com/select/shopping/best-fan-ncna1234882

Fan (machine)

Machine used to produce air flow

This article is about mechanical fans. For hand-powered fans, see Hand fan. For other uses, see Fan (disambiguation).

A fan is a powered machine used to create a flow of air. A fan consists of a rotating arrangement of vanes or blades, 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.[1] 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.

Further information: centrifugal compressor

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.

While fans are often used to cool people, they do not cool air (electric fans may warm it slightly due to the warming of 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. A fan blade is generally made of wood, plastic, or metal.

Fans 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.

These are critical machines and responsible for operating the entire plant, which may shut down without the proper fan. In mine and tunnel, it also used as safety equipment.


The punkah fan was used in India about 500 BCE. It was a handheld fan made from bamboo strips or other plant fiber, that could be rotated or fanned to move air. During British rule, the word came to be used by Anglo-Indians to mean a large swinging flat fan, fixed to the ceiling and pulled by a servant called the punkawallah.

For purposes of air conditioning, the Han Dynasty craftsman and engineer Ding Huan (fl. 180 CE) invented a manually operated rotary fan with seven wheels that measured 3 m (10 ft) in diameter; in the 8th century, during the Tang Dynasty (618–907), the Chinese applied hydraulic power to rotate the fan wheels for air conditioning, while the rotary fan became even more common during the Song Dynasty (960–1279).[2][3]

In the 17th century, the experiments of scientists including Otto von Guericke, Robert Hooke and Robert Boyle, established the basic principles of vacuum and airflow. The English architect Sir Christopher Wren applied an early ventilation system in the Houses of Parliament that used bellows to circulate air. Wren's design would be the catalyst for much later improvement and innovation. The first rotary fan used in Europe was for mine ventilation during the 16th century, as illustrated by Georg Agricola (1494–1555).[4]

John Theophilus Desaguliers, a British engineer, demonstrated the successful use of a fan system to draw out stagnant air from coal mines in 1727 and soon afterward he installed a similar apparatus in Parliament.[5] Good ventilation was particularly important in coal mines to reduce casualties from asphyxiation. The civil engineer John Smeaton, and later John Buddle installed reciprocating air pumps in the mines in the North of England. However, this arrangement was not as ideal as the machinery was liable to breaking down.


In 1849 a 6m radius steam-driven fan, designed by William Brunton, was made operational in the Gelly Gaer Colliery of South Wales. The model was exhibited at the Great Exhibition of 1851. Also in 1851 David Boswell Reid, a Scottish doctor, installed four steam-powered fans in the ceiling of St George's Hospital in Liverpool, so that the pressure produced by the fans would force the incoming air upward and through vents in the ceiling.[6][7] Improvements in the technology were made by James Nasmyth, Frenchman Theophile Guibal and J. R. Waddle.[8]


Between 1882 and 1886 Schuyler Wheeler invented a fan powered by electricity.[9] It was commercially marketed by the American firm Crocker & Curtis electric motor company. In 1885 a desktop electric fan was commercially available by Stout, Meadowcraft & Co. in New York.[10]

In 1882, Philip Diehl developed the world's first electric ceiling fan. During this intense period of innovation, fans powered by alcohol, oil, or kerosene were common around the turn of the 20th century. In 1909, KDK of Japan pioneered the invention of mass-produced electric fans for home use. In the 1920s, industrial advances allowed steel fans to be mass-produced in different shapes, bringing fan prices down and allowing more homeowners to afford them. In the 1930s, the first art deco fan (the "Silver Swan") was designed by Emerson.[11] By the 1940s, Crompton Greaves of India became the world's largest manufacturer of electric ceiling fans mainly for sale in India, Asia, and the Middle East. By the 1950s, table and stand fans were manufactured in bright colors and eye-catching.

Window and central air conditioning in the 1960s caused many companies to discontinue production of fans,[12] but in the mid-1970s, with an increasing awareness of the cost of electricity and the amount of energy used to heat and cool homes, turn-of-the-century styled ceiling fans became immensely popular again as both decorative and energy-efficient units.

In 1998 William Fairbank and Walter K. Boyd invented the high-volume low-speed (HVLS) ceiling fan, designed to reduce energy consumption by using long fan blades rotating at low speed to move a relatively large volume of air.[13]


Mechanical revolving blade fans are made in a wide range of designs. They are used on the floor, table, desk, or hung from the ceiling (ceiling fan). They can also be built into a window, wall, roof, chimney, etc. Most electronic systems such as computers include fans to cool the circuits inside, and in appliances such as hair dryers and portable space heaters and mounted/installed wall heaters. They are also used for moving air in air-conditioning systems, and in automotive engines, where they are driven by belts or by a direct motor. Fans used for comfort create a wind chill by increasing the heat transfer coefficient but do not lower temperatures directly. Fans used to cool electrical equipment or in engines or other machines do cool the equipment directly by forcing hot air into the cooler environment outside of the machine.

There are three main types of fans used for moving air, axial, centrifugal (also called radial) and cross flow (also called tangential). The American Society of Mechanical Engineers Performance Testing Code 11 (PTC)[14] provides standard procedures for conducting and reporting tests on fans, including those of the centrifugal, axial, and mixed flows.


An axial box fan for cooling electrical equipment

Axial-flow fans have blades that force air to move parallel to the shaft about which the blades rotate. This type of fan is used in a wide variety of applications, ranging from small cooling fans for electronics to the giant fans used in cooling towers. Axial flow fans are applied in air conditioning and industrial process applications. Standard axial flow fans have diameters of 300–400 mm or 1,800–2,000 mm and work under pressures up to 800 Pa. Special types of fans are used as low-pressure compressor stages in aircraft engines. Examples of axial fans are:

  • Table fan: Basic elements of a typical table fan include the fan blade, base, armature, and lead wires, motor, blade guard, motor housing, oscillator gearbox, and oscillator shaft. The oscillator is a mechanism that motions the fan from side to side. The armature axle shaft comes out on both ends of the motor, one end of the shaft is attached to the blade and the other is attached to the oscillator gearbox. The motor case joins to the gearbox to contain the rotor and stator. The oscillator shaft combines the weighted base and the gearbox. A motor housing covers the oscillator mechanism. The blade guard joins to the motor case for safety.
  • Domestic Extractor Fan: Wall or ceiling mounted, the domestic extractor fan is employed to remove moisture and stale air from domestic dwellings. Bathroom extractor fans typically utilize a four-inch (100 mm) impeller, whilst kitchen extractor fans typically use a six-inch (150 mm) impeller as the room itself is often bigger. Axial fans with five-inch (125 mm) impellers are also used in larger bathrooms though are much less common. Domestic axial extractor fans are not suitable for duct runs over 3 m or 4 m, depending on the number of bends in the run, as the increased air pressure in longer pipework inhibits the performance of the fan.[15]
  • Electro-mechanical fans: Among collectors, are rated according to their condition, size, age, and several blades. Four-blade designs are the most common. Five-blade or six-blade designs are rare. The materials from which the components are made, such as brass, are important factors in fan desirability.
  • Ceiling fan: A fan suspended from the ceiling of a room is a ceiling fan. Most ceiling fans rotate at relatively low speeds and do not have blade guards. Ceiling fans can be found in both residential and industrial/commercial settings.
  • In automobiles, a mechanical fan provides engine cooling and prevents the engine from overheating by blowing or drawing air through a coolant-filled radiator. The fan may be driven with a belt and pulley off the engine's crankshaft or an electric motor switched on or off by a thermostaticswitch.
  • Computer fan for cooling electrical components and in laptop coolers
  • Fans inside audio power amplifiers help to draw heat away from the electrical components.
  • variable-pitch fan: A variable-pitch fan is used where precise control of static pressure within supply ducts is required. The blades are arranged to rotate upon a control-pitch hub. The fan wheel will spin at a constant speed. The blades follow the control pitch hub. As the hub moves toward the rotor, the blades increase their angle of attack and an increase in flow results.
  • Small box fan with wide feet for stability

    Household electric "box" fan with a propeller-style blade

  • 80 hp variable-pitch supply fan


Main article: Centrifugal fan

Often called a "squirrel cage" (because of its general similarity in appearance to exercise wheels for pet rodents) or "scroll fan", the centrifugal fan has a moving component (called an impeller) that consists of a central shaft about which a set of blades that form a spiral, or ribs, are positioned. Centrifugal fans blow 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 scroll-shaped fan casing. A centrifugal fan produces more pressure for a given air volume, and is used where this is desirable such as in leaf blowers, blowdryers, air mattress inflators, inflatable structures, climate control in air handling units and various industrial purposes. They are typically noisier than comparable axial fans (although some types of centrifugal fans are quieter such as in air handling units).

  • A diagram of a centrifugal fan, with a top view to show airflow

Cross-flow fan[edit]

Cross-section of a cross-flow fan, from the 1893 patent. The rotation is clockwise. The stream guide Fis usually not present in modern implementations.

The cross-flow or tangential fan, sometimes known as a tubular fan, was patented in 1893 by Paul Mortier,[16] and is used extensively in heating, ventilation, and air conditioning (HVAC), especially in ductless split air conditioners. The fan is usually long concerning the diameter, so the flow remains approximately two-dimensional away from the ends. The cross-flow fan uses an impeller with forward-curved blades, placed in a housing consisting of a rear wall and a vortex wall. Unlike radial machines, the main flow moves transversely across the impeller, passing the blading twice.

The flow within a cross-flow fan may be broken up into three distinct regions: a vortex region near the fan discharge, called an eccentric vortex, the through-flow region, and a paddling region directly opposite. Both the vortex and paddling regions are dissipative, and as a result, only a portion of the impeller imparts usable work on the flow. The cross-flow fan, or transverse fan, is thus a two-stage partial admission machine. The popularity of the crossflow fan in HVAC comes from its compactness, shape, quiet operation, and ability to provide a high pressure coefficient. Effectively a rectangular fan in terms of inlet and outlet geometry, the diameter readily scales to fit the available space, and the length is adjustable to meet flow rate requirements for the particular application.

Common household tower fans are also cross-flow fans. Much of the early work focused on developing the cross-flow fan for both high- and low-flow-rate conditions and resulted in numerous patents. Key contributions were made by Coester, Ilberg and Sadeh, Porter and Markland, and Eck. One interesting phenomenon particular to the cross-flow fan is that, as the blades rotate, the local air incidence angle changes. The result is that in certain positions the blades act as compressors (pressure increase), while at other azimuthal locations the blades act as turbines (pressure decrease).

Since the flow both enters and exits the impeller radially, the crossflow fan is well suited for aircraft applications. Due to the two-dimensional nature of the flow, the fan readily integrates into a wing for use in both thrust production and boundary-layer control. A configuration that utilizes a crossflow fan is located at the wing leading edge is the fanwing. This design creates lift by deflecting the wake downward due to the rotational direction of the fan, causing large Magnus force, similar to a spinning leading-edge cylinder. Another configuration utilizing a crossflow fan for thrust and flow control is the propulsive wing. In this design, the crossflow fan is placed near the trailing edge of a thick wing and draws the air of the wing's suction (top) surface. By doing this, the propulsive wing is nearly stall-free, even at extremely high angles of attack, producing very high lift. The external links section provides links to these concepts.

A cross-flow fan is a centrifugal fan in which the air flows straight through the fan instead of at a right angle. The rotor of a cross-flow fan is covered to create a pressure differential. Cross-flow fans are made to have a double circular arc rear wall with a thick vortex wall that decreases in  radial gap. The gap decreases in the direction of the fans impeller rotation. The rear wall has a log-spiral profile while the vortex stabilizer is a horizontal thin wall with rounded edge.[17] The resultant pressure difference allows air to flow straight through the fan, even though the fan blades counter the flow of air on one side of the rotation. Cross-flow fans give airflow along the entire width of the fan; however, they are noisier than ordinary centrifugal fans, presumably[original research?] because the fan blades fight the flow of air on one side of the rotation, unlike typical centrifugal fans. Cross-flow fans are often used in ductless air conditioners, air doors, in some types of laptop coolers, in automobile ventilation systems, and for cooling in medium-sized equipment such as photocopiers.

Uncommon types[edit]


Main article: Bellows

Diagram of a single-acting hand bellows

Bellows are also used to move air, although not generally considered fans. A hand-operated bellows is essentially a bag with a nozzle and handles, which can be filled with air by one movement, and the air expelled by another. Typically it would comprise two rigid flat surfaces hinged at one end, where a nozzle is fitted, and with handles at the other.

The sides of the surfaces are joined by a flexible and air-proof material such as leather; the surfaces and joining material comprise a bag sealed everywhere but at the nozzle. (The joining material typically has a characteristic pleated construction that is so common that similar expanding fabric arrangements not used for moving air, such as on a folding camera, are called bellows.) Separating the handles expands the bag, which fills with air; squeezing them together expels the air. A simple valve (e.g., a flap) may be fitted so that air enters without having to come from the nozzle, which may be close to a fire.

Bellows produce a directed pressurized stream of air; the airflow volume is typically low with moderate pressure. They are an older technology, used mainly to produce a strong and directed airflow, unlike non-electric bladed mechanical fans, before the introduction of electricity.

  • A single-acting bellows will only produce airflow during the exhaust stroke.
  • A double-acting bellows is a pair of bellows capable of blowing out air from one while inhaling air into the other, but airflow still temporarily ceases when the stroke direction is reversed.
  • Combining multiple bellows at third-cycle or quarter-cycle arrangements on a crank arm allows for nearly continuous airflow from several bellows at once; each is in a different phase of inhaling and exhausting during the cycle.

Coandă effect[edit]

An open-face supermarket freezer with an air curtain. Cooling air circulates across the food through the dark slot seen at the rear of the freezer, and through another grille not visible along the front.

The Dyson Air Multiplier fans, and the Imperial C2000 series range hood fans, have no exposed fan blades or other visibly moving parts except their oscillating and tilting head. The airflow is generated using the Coandă effect; a small quantity of air from a high-pressure-bladed impeller fan, contained in the base rather than exposed, drives a large airmass via a low-pressure area created by the airfoil.[18][19][20] The US Patent & Trademark Office initially ruled that Dyson's patent was not an improvement on the Toshiba patent on a nearly identical bladeless desktop fan granted in 1981.[18]Air curtains and air doors also utilize this effect to help retain warm or cool air within an otherwise exposed area that lacks a cover or door. Air curtains are commonly used on open-face dairy, freezer, and vegetable displays to help retain chilled air within the cabinet using a laminar airflow circulated across the display opening. The airflow is typically generated by a mechanical fan of any type described in this article hidden in the base of the display cabinet. HVAC linear slot diffusers also utilize this effect to increase airflow evenly in rooms compared to registers while reducing the energy used by the air handling unitblower.


Differences in air temperature will affect the density of air and can be used to induce air circulation through the mere act of heating or cooling an air mass. This effect is so subtle and works at such low air pressures that it does not appear to fit the definition of fan technology. However, before the development of electricity, convective airflow was the primary method of inducing airflow in living spaces. Old fashioned oil and coal furnaces were not electric and operated simply on the principle of convection to move the warm air. Very large volume air ducts were sloped upwards away from the top of the furnace towards floor and wall registers above the furnace. Cool air was returned through similar large ducts leading to the bottom of the furnace. Older houses from before electrification often had open duct grilles leading from the ceiling of a lower level to the floor of an upper level, to allow convective airflow to slowly raise the building from one floor to the next. Outhouses commonly rely on a simple enclosed air channel in a corner of the structure to exhaust offensive odors. Exposed to sunlight, the channel is warmed and slow convective air current is vented out the top of the building, while fresh air enters the pit through the seat hole.


An electrostatic fluid accelerator propels airflow by inducing motion in airborne charged particles. A high voltage electric field (commonly 25,000 to 50,000 volts) formed between exposed charged anode and cathode surfaces is capable of inducing airflow through a principle referred to as ionic wind. The airflow pressure is typically very low but the air volume can be large. However, a sufficiently high voltage potential can also cause the formation of ozone and nitrogen oxides, which are reactive and irritating to mucous membranes.


Fans generate noise from the rapid flow of air around blades and obstacles causing vortexes, and from the motor. Fan noise is roughly proportional to the fifth power of fan speed; halving speed reduces noise by about 15 dB.[21]

The perceived loudness of fan noise also depends on the frequency distribution of the noise. This in turn depends on the shape and distribution of moving parts, especially of the blades, and of stationary parts, struts in particular. Like with tire treads, and similar to the principle of acoustic diffusors, an irregular shape and distribution can flatten the noise spectrum, making the noise sound less disturbing.[22][23][24]

The inlet shape of the fan can also influence on the noise levels generated by the fan.[25]

Fan motor drive methods[edit]

Building heating and cooling systems commonly use a squirrel cage fan driven by a belt from a separate electric motor.

Standalone fans are usually powered by an electric motor, often attached directly to the motor's output, with no gears or belts. The motor is either hidden in the fan's center hub or extends behind it. For big industrial fans, three-phase asynchronous motors are commonly used, may be placed near the fan, and drive it through a belt and pulleys. Smaller fans are often powered by shaded pole AC motors, or brushed or brushless DC motors. AC-powered fans usually use mains voltage, while DC-powered fans typically use low voltage, typically 24V, 12V, or 5 V.

In machines with a rotating part, the fan is often connected to it rather than being powered separately. This is commonly seen in motor vehicles with internal combustion engines, large cooling systems, locomotives, and winnowing machines, where the fan is connected to the drive shaft or through a belt and pulleys. Another common configuration is a dual-shaft motor, where one end of the shaft drives a mechanism, while the other has a fan mounted on it to cool the motor itself. Window air conditioners commonly use a dual-shaft fan to operate separate fans for the interior and exterior parts of the device.

Where electrical power or rotating parts are not readily available, fans may be driven by other methods. High-pressure gases such as steam can be used to drive a small turbine, and high-pressure liquids can be used to drive a pelton wheel, either which can provide the rotational drive for a fan.

Large, slow-moving energy sources such as a flowing river can also power a fan using a water wheel and a series of step-down gears or pulleys to increase the rotational speed to that which is required for efficient fan operation.

  • Large electric motors may have a cooling fan either on the back or inside the case. (Shown with the black rear cover removed.)

  • Dual shaft fan motor in a window air conditioner

Solar powered fan[edit]

Electric fans used for ventilation may be powered by solar panels instead of mains current. This is an attractive option because once the capital costs of the solar panel have been covered, the resulting electricity is free. Also, electricity is always available when the sun is shining and the fan needs to run.

A typical example uses a detached 10-watt, 12 in × 12 in (30 cm × 30 cm) solar panel and is supplied with appropriate brackets, cables, and connectors. It can be used to ventilate up to 1,250 square feet (116 m2) of area and can move air at up to 800 cubic feet per minute (400 L/s). Because of the wide availability of 12 V brushless DC electric motors and the convenience of wiring such a low voltage, such fans usually operate on 12 volts.

The detached solar panel is typically installed in the spot which gets most of the sunlight and then connected to the fan mounted as far as 25 feet (8 m) away. Other permanently-mounted and small portable fans include an integrated (non-detachable) solar panel.

See also[edit]


  1. ^"Fan". Encyclopædia Britannica. Retrieved 2012-05-19.
  2. ^Needham (1986), Volume 4, Part 2, 99, 134, 151, 233.
  3. ^Day & McNeil (1996), 210.
  4. ^Needham, Volume 4, Part 2, 154.
  5. ^"A Short History of Mechanical Fans". The Worshipful Company of Fan Makers. Archived from the original on December 4, 2013.
  6. ^Robert Bruegmann. "Central Heating and Ventilation:Origins and Effects on Architectural Design"(PDF). Archived from the original(PDF) on January 21, 2016.
  8. ^Cory, William (2010). Fans and Ventilation: A practical guide. Elsevier. ISBN .
  9. ^"B. A. C. (Before Air Conditioning)"(PDF). New Orleans Bar Association. Archived from the original(PDF) on 2012-09-03. Retrieved 2010-07-19.
  10. ^Scientific American. Munn & Company. 1885-07-18. p. 37.
  11. ^"Emerson Silver Swan Fan | Missouri Historical Society".
  12. ^Fancollectors.org – A Brief History of Fans Information Provided by Steve Cunningham – retrieved July 5, 2010.
  13. ^Industrial Fan Designer Finds Niche in Energy Efficiency – Automation and Control, By David Greenfield, December 20, 2010, Blog on Design News, Information provided by Dianna Huff – retrieved May 18, 2011.
  14. ^ASME PTC 11 – Fans.
  15. ^"Choosing a Bathroom Extractor Fan". Extarctor Fan World. July 10, 2018.
  16. ^Paul Mortier. Fan or Blowing apparatus. US Pat. No. 507,445
  17. ^Casarsa, L.; Giannattasio, P. (September 2011). "Experimental study of the three-dimensional flow field in cross-flow fans". Experimental Thermal and Fluid Science. 35 (6): 948–959. doi:10.1016/j.expthermflusci.2011.01.015. ISSN 0894-1777.
  18. ^ abWallop, Harry (October 20, 2009). "Dyson fan: was it invented 30 years ago?". The Daily Telegraph. London.
  19. ^Dyson Air Multiplier Review: Making a $300 Fan Takes Cojones
  20. ^Video Review: The Dyson Air Multiplier, Posted October 12, 2009, by John Biggs, TechCrunch
  21. ^UK Health and Safetey Executive: Top 10 noise control techniques
  22. ^"The Thermodynamics Behind the Mac Pro". Popular Mechanics. 10 December 2019. Retrieved 17 December 2019.
  23. ^ Tae Kim. "Reduction of Tonal Propeller Noise by Means of Uneven Blade Spacing". p. 4
  24. ^ M. Boltezar; M. Mesaric; A. Kuhelj. "The influence of uneven blade spacing on the SPL and noise spectra radiated from radial fans".
  25. ^"UltraFlo Fluid Dynamic Bearing Fans for Thin Laptop Computers".

External links[edit]

Sours: https://en.wikipedia.org/wiki/Fan_(machine)
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Commercial electric model wr4840k30lpl

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Launched as an innovation project in 2017, E-Fan X is the next step in Airbus’ electrification journey; the flight demonstrator that will test a 2 MW hybrid-electric propulsion system is depicted in a composite image over the city of New York. 67 lbs The 4 ft. Evolve to quicker pickups. Torqeedo offers electric drives for sailboats from dinghies to yachts up to 120 feet: compact and powerful outboards, light and space-saving pod drives, one of the most powerful electric saildrives on the market, and the world's first fully integrated hybrid propulsion and energy management system from industrial production. 67/Count) Commercial Electric Products established in 1929 is an industrial based company located in Cleveland, Ohio. View Product. ( 29 Reviews) $399. Commercial Electrics 4 ft. In August 2011, in response to a Presidential Memorandum issued in May 2010. (15 reviews) Your model number and serial number are located on the rating plate on your water heater. High Output Integrated LED Wrap Light is designed with a removable center face panel for easier wiring and installation a breeze. EcoSmart ECO 18 is an 18-kilowatt tankless electric water heater ideal for providing hot water for apartments, condominiums, townhomes and other whole home applications. High Commercial Electric's Low Profile 4 ft. Access setup guides, manuals, tips and more. 1 out of 5 stars. ; UP to 75% ENERGY SAVING - Hykolity's 4FT 40W LED Wraparound light at 4000K neutral white provides over 4400lm,which makes the perfect replacement for traditional 2 lamp 32W fluorescent wrap light fixture and cuts down the electric bill up to 65% instantly. Manufacturers publish emergency response guides for their vehicles and offer training for emergency responders. The Company is dedicated to achieving this objective through implementation, monitoring, and continuous improvement of a Quality Management System that Sep 15, 2014 · Yet, it was Henry Ford’s mass-produced Model T that dealt a blow to the electric car. These walk behind mowers are easy to operate with a single lever to choose from 7 different cutting Electric-drive vehicles are designed with cutoff switches to isolate the battery and disable the electric system, and all high-voltage power lines are clearly designated with orange coloring. Telefónica and NEC to build Open RAN live pilots in 4 global markets as a key milestone toward mass deployment. 50 Gallon Tall 10-Year Hybrid High Efficiency Electric Heat Pump Water Heater. 0-3. Innovation 13 June 2019. The Right Tools for the Job The eL XD offers a wide range of options such as ladder racks, tool chests, and a recessed bed that will allow you to tailor your GEM for the job at hand. (186) $6900. With incredible efficiency, an attractive return on investment and the ability to do a shell and core fit-out, LG commercial HVAC solutions have the functionality, performance and design flexibility to meet the needs of a number of applications. We're committed to providing the best products in order to achieve an improved life. 99 ($66. Read Jim's Review. Save up to $480 per year in energy costs. 6 in.


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Fan Blades Won't Spin? Lets Fix It

Zhejiang Xianfeng Mechanical and Electrical Equipment Co., Ltd.

ZheJiang Xianfeng Mechanical and Electrical Equipment Co., Ltd was established in 2016 with a registered capital of 10 million yuan. It is a domestic enterprise that independently develops and professionally produces large-scale industrial fans. The company has passed ISO9001-2008 international quality system and CE, 3C certification.

Over the years, the company has always focused on the R &D ...

ZheJiang Xianfeng Mechanical and Electrical Equipment Co., Ltd was established in 2016 with a registered capital of 10 million yuan. It is a domestic enterprise that independently develops and professionally produces large-scale industrial fans. The company has passed ISO9001-2008 international quality system and CE, 3C certification.

Over the years, the company has always focused on the R & D and manufacturing of large-scale industrial fans, taking quality management as the foundation, technological innovation as the driving force, modern management, advanced production equipment, strong R & D and production technology service team, to build a first-class enterprise and become the leader of the domestic industry.

As a large-scale enterprise with independent R & D and production in China, we are always committed to the technical R & D of large-scale industrial fans. After years of accumulation, honing and development, we have witnessed the whole process of large-scale industrial fans from scratch, from single to multi varieties with a number of invention patents. The core key technology system formed by long-term accumulation of test precipitation has always ranked the top in the industry.

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Fans who electric makes commercial

18inch Floor Fan Commercial Electric Fans

18inch Floor Fan Commercial Electric Fans

Q: I want to get some free samples from your company, can I?
A: Company policy that all customers must pay the sample fee and shipping costs, when you place an order, sample fee will be returned to you.


Q: What is the MOQ of your products?
A: The MOQ of our products is 1000 pcs for one model one size


Q: I'd like to Mix several models in one container. May I?
A: Certainly. If each model have 1000pcs.


Q: We'd like to print our LOGO on the appliances. Can you make it?
A: We provide OEM service which including logo printing, gift box design and carton design. you can also use our Logo "YAXIN".


Q: How about the Delivery Time? 
A: 35 days after the receipt of deposit and confirmation on all designs based of normal condition.


Q: I'd like to know your Payment Terms.
A: T/T, irrevocable L/C at sight,D/P.


Sours: https://www.alibaba.com/product-detail/18inch-Floor-Fan-Commercial-Electric-Fans_60530522952.html
Ceiling Fan Universal Mounting Bracket

General Purpose Fans vs. Industrial Fans

While both fan types might appear to be the same, there are some major differences between how they are made and how they perform. The main difference between the two types is generally driven by cost.

General purpose fans use the least expensive materials and components and are designed for the residential or light duty commercial markets. These fans are used in homes, appliances and small ventilation systems.

Industrial fans are designed with heavier duty materials and components to operate longer, supply greater air flow and pressure, and meet more stringent environmental and ambient requirements.

The characteristics of the two types of fans are as follows and apply to both centrifugal fans and axial fans.

 General Purpose FansIndustrial Fans
Material Gauges:Light gauge sheet metal and plastic.

10 gauge to plate material. Cast aluminum and stainless steel construction available.

Construction:Tabs and lock seams.Continuous welds.
Bearings:Sleeve or strap type. Short bearing life.Ball or roller bearings in cast iron bearing housings. Much longer bearing life.
Motors:Light duty, sleeve bearings, no service factor, minimum design features. Open Drip Proof enclosure.Continuous duty, ball bearings,with service factors, special design features, generally TEFC or EXP enclosures.
Safety Factors:Slower wheel and shaft speeds.Much higher wheel and shaft speeds.
Air Flow: Generally limited to 2000
CFM or less.
From 200 to over 100,000 CFM.
Pressures: Generally .10" to 4.0" static pressures.From .50" to over 100" static pressures.
Sours: https://www.cincinnatifan.com/industrial-general-fans.htm

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