Creating high-density airflow is possible in several ways. One of the effective ones is a radial type fan or “snail”. It differs from others not only in shape, but also in its operating principle.
Fan device and design
Sometimes an impeller and a power unit are not enough to move air. In conditions of limited space should be used special kind designs exhaust equipment. It has a spiral-shaped body that acts as an air channel. You can make it yourself or purchase a ready-made model.
To form the flow, the design includes a radial impeller. It connects to the power unit. The wheel blades have a curved shape and create a discharged area when moving. Air (or gas) enters it from the inlet pipe. When moving along the spiral body, the speed at the outlet increases.
Depending on the application centrifugal fan snail maybe general purpose, heat-resistant or corrosion-resistant. It is also necessary to take into account the amount of air flow created:
- low pressure. Scope of application: production workshops, Appliances. The air temperature should not exceed +80°C. Mandatory absence of aggressive environments;
- average pressure value. It is part of exhaust equipment for removing or transporting small fraction materials, sawdust, grain;
- high pressure. Forms an air flow into the fuel combustion zone. Installed in many types of boilers.
The direction of movement of the blades is determined by the design, and, in particular, by the location of the outlet pipe. If it is located on the left side, the rotor should rotate clockwise. The number of blades and their curvature are also taken into account.
For powerful models you need to do it yourself solid foundation with housing fixation. The industrial installation will vibrate strongly, which may lead to its gradual destruction.
Self-production
First of all, you need to decide functional purpose centrifugal fan. If it is necessary for ventilation of a certain part of the room or equipment, the housing can be made from scrap materials. To complete the boiler, you will need to use heat-resistant steel or make it from stainless steel sheets yourself.
First, the power is calculated and the set of components is determined. The best option The snail will be dismantled from old equipment - an extractor hood or a vacuum cleaner. The advantage of this manufacturing method is the exact match between the power of the power unit and the body parameters. A snail fan can be easily made with your own hands only for some applied purposes in a small home workshop. In other cases, it is recommended to purchase a ready-made model industrial type or take the old one from the car.
Procedure to make a centrifugal fan with your own hands.
- Calculation overall dimensions. If the device will be installed in a confined space, special damper pads are provided to compensate for vibration.
- Manufacturing of the body. If there is no ready-made structure, you can use plastic sheets, steel or plywood. In the latter case Special attention is given to sealing joints.
- Installation diagram of the power unit. It rotates the blades, so you need to choose the type of drive. For small designs, a shaft is used to connect the motor gearbox to the rotor. In powerful installations, a belt type drive is used.
- Fastening elements. If the fan is installed on the outer casing of, for example, a boiler, mounting U-shaped plates are made. With significant power, it will be necessary to make a reliable and massive base.
This general scheme, according to which you can make a functional exhaust centrifugal unit with your own hands. It may change depending on the availability of components. It is important to comply with the housing sealing requirements, as well as ensure reliable protection power unit from possible clogging with dust and debris.
The fan will make a lot of noise during operation. Reducing this will be problematic, since vibration of the body when moving air flow It is almost impossible to compensate with your own hands. This is especially true for models made of metal and plastic. Wood can partially reduce background noise, but at the same time it has a short service life.
In the video you can see the process of manufacturing a case from PVC sheets:
Review and comparison of production ready models
Considering radial fan snail, it is necessary to take into account the material of manufacture: cast aluminum body, sheet or stainless steel. A model is selected based on specific needs; consider an example of serial models in a cast case.
Sitting at the computer in summer time many people begin to suffocate from the heat; it’s good if there is air conditioning, but it’s not always convenient to turn it on. In this article we will tell you how to do USB fan with your own hands, from a motor, a cooler and a small engine. We will show you the manufacturing process and step by step instructions, we will highlight two of the simplest and most effective methods.
Making a fan using a computer cooler
To make a fan at home and not have to strain at all, we found this method on the Internet. The entire manufacturing process will take no more than 20 minutes, you can use old coolers or just buy a new one in the store, the price for them is now a pittance.
First we begin to prepare the cooler, it has two wires: red and black. We remove 10 mm of insulation from each wire; there is even an insulation stripper. The size of the cooler does not play a special role; of course, it is better if it is big size, the wind flow will eventually be stronger. 
We begin preparing the USB wire; to do this, cut off one half at the main cut and remove all the insulation. We will get four wires: two black and two red, we also strip them. If there are other green or green wires on the cooler white we cut them off, they just get in the way. Learn how to make a thermoelectric generator with your own hands.
In the end result, you need to connect the wires to each other, there may be several ways, the main thing is to remember the color coding. Don’t forget to isolate everything from each other, the more isolation, the better. For convenience, the finished cooler can be installed in regular box them under the shoes, so it will be more stable. 
This is how the guys in the video suggest we make a fan from a cooler. The method is actually simple, we don’t promise strong airflow, but working at the computer will be much more pleasant.
How to make a USB fan with your own hands using a motor
So, to make a fan from a disk motor and a usb, we will need more time, but this type of fan will look better. Anyone can make such a device, the main thing is to show a little desire and patience. 
First of all we need to make the blades for our fan, we recommend using a regular CD drive, it looks great and is quite easy to make. Also read interesting article, where we make laser levels.
Here are the guys with the video showing a really cool method. In a similar way, you can make a fan out of paper, but remember, the paper must be thick; it is optimal to use cardboard.
The question is trivial. First, we recommend determining the installation location homemade fan. Two types of engines dominate in technology: commutator (historically the first), asynchronous (invented by Nikola Tesla). The first ones make a lot of noise, switching sections causes a spark, the brushes rub, causing noise. An asynchronous motor with a squirrel-cage rotor is quieter and generates less interference. You will find the start-up protection relay in the refrigerator. By adding a couple of phrases of humorous phrases, we will return the seriousness of the site. How to make a fan with your own hands without scaring your family. Let's try to answer.
Aspects of designing a homemade fan
The design of the fan is so simple that there is no point in telling or describing the insides. What to consider when designing? Remember the growl cyclonic vacuum cleaner, volume above 70 dB. Inside is a commutator motor. Often deprived of the ability to regulate speed. Decide, is a similar sound pressure level acceptable at the installation site of a homemade fan? Having chosen the second, we will concentrate on asynchronous motors, simple models do not require a starting winding. The power is low, the secondary EMF is induced by the stator field.
Drum asynchronous motor with a squirrel-cage rotor, cut with copper conductors along the generatrix, at an angle to the axis. The direction of the slope determines the direction of rotation of the engine rotor. Copper conductors are not insulated from the drum material, the conductivity of the Olympic metal exceeds the surrounding material (silumin), the potential difference between adjacent conductors is small. Current flows through copper. There is no contact between the stator and rotor, the spark has nowhere to come from (the wire is covered with varnish insulation).
The noise of an asynchronous motor is determined by two factors:
- Alignment of stator and rotor.
- Bearing quality.
By properly setting up and servicing an asynchronous motor, you can achieve almost complete noiselessness. We recommend considering whether sound pressure level is important. The case concerns a duct fan - it is allowed to use a commutator motor, the requirements will be determined by the location of the section.
The duct fan is placed inside the air duct section and mounted, breaking the duct. The section is removed for maintenance.
Noise loses its dominant role. The sound wave, passing through the air duct, attenuates. Particularly fast is the part of the spectrum that has inconsistent dimensions relative to the width/length of the path section. Read more textbooks on acoustic lines. The brushed motor can be used in a basement, garage, or unoccupied areas. The neighbors of the cooperative will hear, but will rather be too lazy to pay attention.
What is good about a commutator engine, what are we fighting for the right to use. Three disadvantages of asynchronous:
At the initial moment, the asynchronous motor does not develop a large torque; a number of special design measures are taken. It doesn't matter for the fan. Most household models are equipped with asynchronous motors. In production, the number of phases is increased to three.
Finding a motor for a fan
One YouTube video suggested using an engine direct current 3 volt from a hardware store. Tops a USB cord, works by rotating the laser disc blade. Useful invention? If you're tired of the extra port, this will help you survive the heat. It’s easier to take a processor cooler and power it from the system unit. The yellow wire goes to 12 volts (red to 5). The black pair is earth. You can assemble it from an old computer. Citizens of the Russian Federation are simply too lazy to invent, so we throw interesting equipment into a landfill.
Asynchronous fan motors operate without a starting capacitor... The peculiarity of fan motors is that they come directly with a winding. A couple of tips to help you get an engine:
Make a fan impeller
The question of what to make a fan from has not been resolved; the authors kept silent about the impeller. First things first, the refrigerator! The compressor is blown by an impeller. When you get the motor out, remove it. It will come in handy. Concerning washing machine, launch the drum onto an aircraft propeller. Plastic tank It's good to make a body. Heat the bend areas with a hair dryer.
Inspect the blender and equip it with an unnecessary laser disk shaped like an impeller. You can make a fan yourself using available materials. You don't need a lot of power, and there's no point in trying too hard to fine-tune the details. We believe that readers know how to make a fan with their own hands.
Eternal CPU cooler fan
We decided to please our readers by telling you how to make a fan. This is not the first review, I had to dig around to find something worthwhile. The idea of creating an eternal fan that spins forever looks great. User mail.ru posted a design that looks attractive. Let's take a closer look, while thinking about how to make a fan that runs forever.
You know, of course, system units work quietly ( modern models). The slightest noise means: the cooler's axis is out of alignment, or it's time to lubricate the old fan. They work for hours, the days turn into weeks, system unit will last for years. It became possible thanks to well-thought-out technology. Think about it, noise depends on the magnitude of the friction force. Mechanical energy becomes thermal and acoustic due to the presence of roughness. CPU coolers rotate easily, just blow on them.
The author of the video - we apologize for the lack of a name, we justify: the video is in English - suggests assembling an eternal fan from an accessory. The fitting accuracy of the parts is high, the blade rotates easily. Costs are reduced to a minimum. The author of the video posted by the deirones channel noticed: the processor fan is powered by direct current. I climbed inside and found four coils, equally spaced around the circumference, with their axes directed towards the center of the device.
There are no commutators inside, which means a paradoxical fact: the field of the coils is constant.
If the induction motor of a typical fan is powered by 220 volts alternating voltage, which creates a rotating magnetic field, in our case the picture is constant. You could say: inside the rotor sets in motion a commutator that creates the desired distribution. This is not true, and is confirmed by the author’s further train of thought and the result of experience. Western innovator decides to replace the coil permanent magnet. Indeed, no variable field– why electric current?
The author demonstratively cuts off the power cord and places the neodymium (hard drive) magnets around the perimeter of the frame. Each is on the continuation of the coil axis. The work is completed, the blades begin to rotate vigorously. We believe that a principle is simply used that is hushed up in orthodox literature. Trade secret of the patent holder.
The initial movement of the blade is obtained by random air fluctuations. Reminiscent of a magnetron, the oscillations are caused by natural chaotic movement elementary particles. The question arose as to what determines the direction of rotation. The design is absolutely symmetrical. We decided to look into it and express our observations:
Agree, it’s more convenient than messing up USB ports and constantly wasting batteries. The eternal fan operates from an arbitrary position and is devoid of wires. We believe that the strength of the magnets plays a decisive role. The simple rule no longer works: more is better. A golden mean is emerging. When the blades spin from a random air flow, overcoming a field of neodymium pieces. Weak magnets are probably powerless to maintain stable rotation. The field strength must be exactly that created by the coils under the influence of +5 or +12 volts.
Correctly create an eternal fan
We discussed how to make a fan, measure the direction, force magnetic field coils Enjoy special devices. A magnetometer, Teslameter, is formed by a magnetic induction converter, a measuring module. When fields interact, the resulting pattern is called coupling. The converter generates EMF. The size is determined by the measured strength of the magnetic field. Like two fingers! Costs 10,000 rubles.
The magnets will be located at a considerable distance from the axis. The coils are much closer. You need to know how the picture changes with distance. According to Coulomb's law, the force decreases in inverse proportion to the square of the distance, which is true for single charges of arbitrary sign. Magnetic poles individual ones have not yet been found in nature (it is not possible to create them), the cube of distance is included in the law. Let's say the distance to the coil from the axis is 1 cm, the diagonal perimeter is 10. This means that neodymium should be 10 x 10 x 10 = 1000 times stronger than a small coil.
Nobody obliges to place neodymium magnets around the fan perimeter on diagonals. The poles lie crosswise. Adjust the force of influence over a wide range. By placing neodymium magnets in the center of the sides of the fan frame, we significantly increase the field strength. Let's do the calculation. Let's say the hypotenuse of a triangle with a side of 10 cm is a diagonal. The distance to the center of the square will be equal to 10 / √2 = 7 cm. You see, the ratio from 1000 drops, reaching 7 x 7 x 7 = 343. It is important for those who are desperate to find strong magnets neodymium to create an eternal fan.
Let's measure the strength! A compass is suitable (there are custom designs that you can assemble yourself, for example, http://polyus.clan.su/index/indikatory_magnitnogo_polja_svoimi_rukami/0-52). One coil should be connected to the power supply. Then find the position, the arrow brought up will deviate by about 45 degrees (if you don’t like it, take any other azimuth). Then start experimenting with neodymium. Place the piece at different distances, ensuring that the arrow deflection coincides with that obtained when using the processor fan coil. Surely the distance is not equal to the diagonal, half the side, the neodymium will have to be broken and cut.
By sawing one edge along the length, we carefully break the parts on a nail, obtaining the required field strength to create an eternal fan. We assume that the induction is distributed proportionally to the volume. Today we explained clearly how to make a fan with your own hands!
Power supply
Anyone who wants to make a fan with their own hands sees 3 problems: getting a motor, power supply, and making a propeller. The parts must fit together. Three problems solved, you can start making a fan with your own hands. Today there are an abundance of switching power supplies at home. Think about it, it started in the 90s. Gaming consoles, Cell phones, other equipment. Equipment breaks down, switching power supplies remain. The voltage is sometimes non-standard; most motors operate on any voltage. The revolutions will simply change according to the voltage. There's a broken one lying around at home Appliances– Make a fan yourself immediately.
Homemade fan power supplies
People are constantly trying to make a special fan with their own hands. One issue is often beyond the scope of discussion: the power source. The design of the fan itself is so obvious that there is no point in going into more detail. So, it’s clear that there are an unimaginable number of batteries today. Will they be able to work for a long time? The answer is no. As a last resort, take the “crown”, in Soviet time considered a reliable source of energy. The power supply is bad, the power will gradually drop, the speed will decrease, and it will irritate people. Stability without additional effort is important. There is no small 12 volt battery - get ready: let's start looking for how to make a power source for a homemade fan.
The first thing that comes to mind is to screw up the computer. It is known that miniature devices are powered by a USB port. Gadgets are recharging. The USB port is a source of inexhaustible energy. The voltage is low, you will need a low voltage DC motor. We believe you can find it at home or buy it at a hardware store. How much port power will be: according to old standards, 2–3 W. Another thing is to find a host device with updated version interface (recognized as a rarity in 2014). The developers promised to deliver 50 W (it’s hard to believe even more). True, there will be more wires, the rated voltages will increase. We remind you that according to tradition, power is supplied to the red (+), black (-) wires. White, green - signal.
It’s clear that it’s difficult to expect much power - even if the port supports it, the motor won’t pull it. It is recommended to look for a higher voltage. The motor must be supplied with higher voltage. For example, it is recommended to use a processor cooler. The supply voltage is less than the required 12 volts, the rotation speed will simply decrease. Beware of exceeding it - the motor may burn out.
We are looking for energy, the question is easier to solve than for 3 volts:
12 volt power supply for a homemade do-it-yourself fan
We suggest not to assemble a switching power supply, but to make a regular one with your own hands. Let us remember that the former are distinguished by small-sized transformers. Therefore, the power supply will be relatively large in size. Will consist of the following parts:
- A step-down transformer. We will not name the number of turns in advance, the voltage is unknown, rectifying it with diodes, we get 12 volts. Of course, you can experiment, like the YouTube video about homemade radios Having captured the reader, we will look for a ready-made solution.
- The bridge is full-wave; by adding three to one diode, we increase the efficiency. Radio components are not very expensive.
- The backbone of the power supply is ready so that the homemade fan can serve for a long time, let’s straighten out the network ripples. After the bridge, we will turn on the low-pass filter and redraw the circuit from the Internet.
The output is a constant voltage with an amplitude of 12 volts. Be careful not to mix up the terminals. Where the “plus” comes out and where the “minus” comes out can be understood by studying the diagram. Below is a drawing of the bridge, look and read the explanations. In radio electronics, the direction of current is indicated opposite to the true one. Charges flow, according to popular belief, in the direction from plus to minus (towards electrons). Reading the diagram, you will see: the emitter of the diode, transistor, marked with an arrow, looks incorrectly. In the direction of movement of positive charges. Each one has marks and is indicated on the diagram by a huge triangle arrow. Therefore, we always find out “plus”, guided by graphic symbols shown in the drawing.
The figure shows: the plus will be on the right, transmitted according to the diode arrow to the lower output terminal. The minus will go up. With alternating voltage (roughly speaking), plus and minus will alternate from left to right, the name of the rectifier will become clear - full-wave. Works on the positive part of the voltage and the negative. Take power, low-frequency diodes. Solid size, power dissipation is relatively high. You can calculate using a simple formula taken from training course physics. We multiply the resistance of the open p-n junction (we leaf through the reference book) by the current consumed by the motor, taking a margin of at least 2 times. The motor body contains an inscription indicating the power, which can be divided by the voltage of 12 volts, simply multiplied by 2 - 3, and taken a diode with equivalent power dissipation (see the reference book).
Now let's calculate the transformer... We went here http://radiolodka.ru/programmy/radiolyubitelskie/kalkulyatory-radiolyubitelya/, chose the Trans50 program, we will master it. Please note that there is software that allows you to calculate filter parameters. Do you regret that you decided to make a fan yourself? They offer to choose one of 5 windings. Steel is involved everywhere. You can make do, the losses will be great. The steel forms a magnetic circuit, the energy goes to the secondary winding. It's better to find an old rusty transformer. Times are bad; in the hungry 90s, landfills were littered with plates of scrapped windings. There were no problems with winding the transformers.
It's time to understand what voltage is required for the correct operation of the circuit. A term borrowed from electronics will help: effective voltage alternating current. Voltage at the active resistance creating a thermal effect equal to the constant voltage of the effective amplitude. To obtain the required voltage on the secondary winding, you need to divide 12 volts by 0.707 (one divided by the square root of 2). The authors received 17 volts. The engineering calculation has an error of 30%, let's take a small margin (part of the amplitude up to 1 volt will be lost on the diodes).
As for the secondary winding current (required for calculation), type something like “cooler power” into a search engine. Let's do it together with the readers. Smart articles write: the current consumption of the cooler is indicated on the case. Once you have the required parameter, we’ll plug it into the calculator. The author took the voltage of the secondary winding to be 19 volts. The voltage drop across p-n junctions of powerful silicon diodes is 0.5 - 0.7 volts. Therefore, an appropriate reserve is needed. Smart heads searched and concluded that the processor cooler does not consume more than 5 W, therefore, the current is 5 divided by 12 = 0.417 A. We substitute the numbers into the downloaded calculator, and for the strip core we get the transformer design parameters:
- The cross-section of the magnetic core for winding is 25 x 32 mm.
- Window in the magnetic circuit 25 x 40 mm.
- The magnetic core is finished with a frame for winding wire with a thickness of 1 mm and a cross-section of 27 x 34 mm.
- The wire is wound along the larger side of the window, leaving a margin of 1 mm from the edges, for a total of 38 mm.
The primary winding is formed by 1032 turns with a diameter of 0.43 mm. The approximate length of the wire is 142 meters, the total resistance is 17.15 Ohms. The secondary winding consists of 105 turns of a copper core with varnish insulation with a diameter of 0.6 mm (length 16.5 meters, resistance 1 Ohm). Now readers understand: the question of what to make a fan from begins to be decided by the core...
How effective are the proposed technical solutions? Fans are known Ancient Egypt. Evidenced by Michael Jackson's video recommending “Remember the time.” The plot was hardly prepared without the consultation of archaeologists and historians. We would like to report that in Mexico, most ladies use fans. The Spaniards know how to deal with the heat; the country lies on the equator. Think about it...
Installing a fan is a sensitive issue. Before making a fan with your own hands, you need to determine its installation location. The fact is that in the manufacture of structures today two types of engines are used:
- collector;
- asynchronous.
During operation, collector units emit a lot of noise, and when it switches, a spark occurs. In addition, the movement of the brushes also makes a lot of noise.
Asynchronous motors, which are equipped with a squirrel-cage rotor, are the exact opposite. At self-production For fans, you can use an element from the refrigerator as a starting relay.
Fan Manufacturing Principles
When making a fan yourself, you need to take into account some aspects, the most important of which is noise. To get an idea of the work commutator motor, you just need to remember how the Cyclone vacuum cleaner works, its volume is about 70 dB. Based on this, you should consider whether to use such an engine or not. In this regard, it is most realistic to use an asynchronous motor; moreover, when making the simplest fan model, a starting winding is not required. And its power is small, and the secondary EMF is induced by the field from the stator.
The drum in an asynchronous motor has a squirrel-cage rotor with cut copper conductors along the generatrix, passing at an angle relative to the axis. It is this slope that determines the direction of rotation of the rotor in the engine. The copper conductors are not insulated from the drum material, since they have a conductivity that is superior to the surrounding material, and the potential difference between adjacent conductors is small. And due to this, a current flows through the copper. The stator and rotor are not connected to each other by contacts, and therefore no spark occurs, since the wire is covered with varnish insulation. That is why the noise of an asynchronous motor is determined by the following factors:
- ratio of stator and rotor;
- quality of bearing elements.
At correct setting With an asynchronous motor, silent operation of the motor can be achieved. Well, what if we're talking about about how to properly make a duct fan with your own hands, then you can allow the installation of a commutator motor, but taking into account where the section will be located.
The duct fan is installed in the air duct section itself and is located in the center of the duct. For this reason, when a fan is made in an air duct, noise does not play a special role, since the sound wave attenuates while it passes through the duct.
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To make a fan yourself, you need to purchase a model of a kitchen or bathroom fan, the one that is mounted to the hood. The box from under it will also come in handy, and you will also need:
- scissors;
- net;
- glue or tape.
Fan installation diagram.
The structure will be powered from the network, but will consume little electricity. To begin with, take a box and make a through hole in it. The design of the fan for cylindrical hoods will also be the basis for the shape of the hole.
Subsequently, a fan will be installed in this hole. The hole is cut with a smaller diameter than the structure itself in order to make it more stable and safe. An opening is made on the side of the bottom of the box to allow the cord to exit. To prevent the fan from dangling in the box, you can place cardboard scraps in it and secure it with electrical tape. For safety, a protective mesh is installed on the front part where the blades are located. The denser the mesh in the mesh, the less likely it is to get caught by the blades. Making a homemade fan does not require much expense, and if you decorate the box, you can get additional element interior arrangement.
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USB fans: features
Such a model will not be easy to make. This great option for individual cooling when working at a computer. Such a device is obtained with sufficient power, and the energy consumption is not much more. To construct this design you will need:
- a couple of CDs for the computer;
- cord with USB plug;
- wires;
- an old motor, the kind usually installed on children's toys;
- wine stopper;
- cylindrical cardboard;
- glue and scissors.
First of all, the disk is cut into blades. The power of the air flow depends on the presence of blades; the more there are, the stronger the blowing will be, but the segments themselves should not be small.
Only one disc is cut, the second will be used as a stand.
To bend the blades, they are heated over a small flame and bent forward at an angle.
They should be turned in one direction. When the disk with blades is ready, a plug is inserted into its center and a hole is made in it.
In order to make the wire usable, the outer winding is removed from one end of the USB cord, under which there are 4 wires. The paired ones can be separated, connected to the motor and insulated.
The weather is getting warmer outside, it's time to think about ventilation. In this episode Roman Ursu will do bladeless fan. You can easily repeat this product with your own hands. Four pieces of cardboard are used in the product. The width must match the width of the cooler. 120 mm. A switch and power connector are built into the housing. Let's take the dimensions and make a hole according to the required diameter. You will also need a 12-volt power supply for a cooler that consumes 0.25 m. The unit is 2 amperes, so that’s enough. Top part The Dyson fan is cylindrical in shape. This means that we draw two circles with a diameter of 15 cm. One of them is 11 cm, the other is 12 cm. To ensure that the parts stick well to the base, we take one of the walls, apply the parts, draw a line and cut them off. Now, to form the cylinders, you will need three segments with the following dimensions: 12 x 74, 12 x 82, 15 x 86 cm. We will figure out what and where to glue at the assembly stage. Let's make cuts in each wall. These will be the air channels. They look like nice legs.
Let's start assembling a beautiful bladeless fan, placing the courier in the middle. We glue each wall one by one. The wires can be removed as shown in the video. It would be nice to figure out the connection. We use a switch, so we separate one of the wires and form a circuit. The wires go to the power connector, black to minus, red to plus.
You need to connect all the previously prepared parts with your own hands. Take a ring with an internal diameter of 11 cm. It will be in front. And the segment is 12x74. We connect as in the video.
We repeat the same with the second ring and the 12 x 82 blank. To keep the rings fixed and stable, we use five small strength partitions. The length is just under 12 cm. All that remains is to close the structure.
We use the last piece 15 x 86 cm.
Finally, we make it beautiful, remove excess glue, and cover it with paint. In general, the bladeless fan is ready.
There's a lot ahead useful homemade products, we are waiting for the warm sun to shoot the next video and show it on the channel.