A fan in the chimney for forced exhaust of gases from the stove. Fireplace fans Do-it-yourself forced exhaust for a chimney

Previously, draft and blower fans were used only in industrial boiler installations. The first ones are placed inside the chimney channel and create a vacuum, the second ones pump air into the firebox. Gradually, the units migrated to the domestic sphere - manufacturers began to equip heaters with a closed combustion chamber with turbines. The idea was picked up by home craftsmen, because a smoke exhauster for a boiler helps solve the problem of poor draft in the chimney pipe. Let's figure out whether forced exhaust of combustion products is always necessary.

Design and principle of operation

An exhaust fan for a factory-made boiler includes the following elements (the device is shown in the diagram, the positions coincide with the points):

1. Metal heat-resistant impeller with blades bent at 90° relative to the impeller.
2. Mounting plate.
3. Low-performance electric motor (20…50 W).
4. Power cable connector.
5. Remote control with controls and controls.
6. The flask and capillary tube of a temperature sensor connected to an emergency thermostat.
7. Power cord with plug.

Note. The boiler smoke exhauster DM-01 from Kalvis is taken as an example. The design of other types of fans differs in the shape of the housing - volute, box, hemispherical landing pad. The set of parts is similar.

The unit is attached to a special box located on the rear panel of a domestic TT boiler next to the chimney pipe. The temperature sensor bulb is inserted into the immersion sleeve of the water jacket, the remote control is placed separately.

The principle of operation of the smoke exhauster is the forced removal of high-temperature gases from the fire-tube heat exchanger of the boiler into the chimney. The algorithm looks like this:

1. The firebox is filled with wood and ignited.
2. The loading door is locked, the blower door is opened. The fan is turned on using a key on the remote control, then the performance is adjusted.
3. When the heating installation and chimney have warmed up, the impeller speed is manually reduced to a minimum. If the heat generator has enough natural draft, it is recommended to turn off the smoke exhauster.
4. When the coolant heats up to a critical temperature of 100 °C or more, at the command of the sensor, an emergency thermostat is triggered, turning off the fan automatically.

Reference. On TT boilers equipped with automatic control, there is no need to open the ash pan door. The thermostat, through a chain, will open the air supply damper to the required angle.

High or low performance of the draft fan is set individually depending on the quality of solid fuel, combustion mode and degree of heating of the chimney. The main thing is to avoid the accumulation and leakage of smoke into the room.

You also can’t go overboard with the speed - the lion’s share of the heat will go down the drain. Before opening the door and reloading, it is better to increase the rotation speed to maximum.

Types of traction fans

For and wood fireplaces Several types of smoke exhausters are sold:

• boiler (the design is discussed above);
• centrifugal channel;
• overhead;
• fireplace/stove (aka roof).

Various attachments that improve natural draft, such as deflectors, round rotating elements and rotating weather vanes, should not be classified as smoke exhausters. The effectiveness of these hoods depends on the wind speed, which changes with the weather.

The duct fan is distinguished by its own housing with two connecting flanges or pipes. The unit is installed vertically or horizontally into the gap in the chimney duct. The device and principle of operation are similar to the operation of a boiler smoke exhauster.

The overhead smoke exhauster for a domestic boiler is equipped with a semicircular platform and clamps-ties. Installation is carried out on a vertical section of the chimney (uninsulated):

1. An opening is cut out in the pipe using a paper template.
2. The impeller of the traction machine is inserted into the hole, and the platform with the electric motor is pressed to the surface with clamps.
3. The connection is sealed with an asbestos cord glued to inside installation site of the smoke exhauster.

Note. The overhead element is selected according to the diameter of the flue pipe. The installation process is demonstrated in the video.

Electric hoods are mounted on the head of a brick chimney and secured with spacer bolts. The power cable is laid through a pipe and introduced into the room next to the home stove.

To choose a traction machine, you need to focus on 3 criteria:

• heat generator power, smoke exhauster models are designed for boiler performance up to 20, 30, 50 and 100 kW;
• installation point - on the boiler itself, pipe or head;
• for overhead models – the diameter of the uninsulated flue.

When do you need a smoke exhauster?

Manufacturers of heating equipment equip their products with traction fans due to the increased resistance of the heat exchanger, where gases change direction of movement several times through the flame tubes. The goal is to remove maximum heat from combustion products and increase the efficiency of the boiler installation.

A nuance: the operation of the smoke exhauster in a factory-installed boiler is coordinated with the combustion process and is controlled by an electronic unit. When installing a fan unit on a “brainless” heater, such consistency is excluded; you need to buy an automatic unit or adjust the speed manually.

We list the situations when a smoke exhauster will help improve the operation and maintenance of a solid fuel heat generator:

• problems with draft - blowing by the wind, air pockets in the gas duct, many turns, narrowing of the diameter;
• due to the design features, the boiler smokes into the room when the door is opened;
• the height of the chimney is insufficient or the cut of the pipe falls into the wind support zone behind the ridge of the roof or another building;
• Cracks have appeared in the brick pipe, from which smoke is leaking.

Important point. No fan will save the situation if there is no influx from the street in the boiler room. At first, the working impeller will create a slight vacuum, but then the blades will begin to mix the air in place. – a prerequisite normal operation any heater.

Some wood boiler designs (for example, shaft type) tend to emit smoke through an open loading hatch. A similar picture is observed in heat generators with a three-pass fire-tube heat exchanger of high resistance. The solution to the problem is to install a traction or blowing machine controlled by a controller.

Strengthening natural draft with the help of a smoke exhauster also has a downside. If after warming up the pipe natural exhaust has not recovered, the unit cannot be turned off - you may get burned. Now imagine that in the middle of the night the power supply goes out and the fan stops. While the chain thermostat closes the damper, smoke will fill the boiler room.

Which is better - a smoke exhauster or a blower?

When the traction turbine is integrated into the heat generator by the manufacturer, similar questions does not arise. Another thing is adding an exhaust fan to a conventional direct combustion boiler. You need to understand that in this case the smoke exhauster solves only 1 problem - creating a vacuum in the firebox and increasing draft. There are a number of negative points here:

1. Without an electronic control unit, performance will have to be adjusted manually. Automatic maintenance coolant temperature is excluded.
2. When air is supplied through the open ash chamber door, the fan will force the boiler to work at maximum. Setting up a long burn mode will not be easy.
3. In the event of an emergency stop of the impeller, fuel combustion will not stop, since gases pass freely through the volute or the body of the smoke exhauster. Air enters the firebox, increasing the likelihood of overheating.
4. Impeller and internal surfaces the unit becomes covered with soot, which must be removed. The rate of sticking depends on the moisture content and resin content of the wood.

Comment. We don't mention the fan's power consumption. The consumption is relatively small and will not have a significant impact on the overall cost of heating.

The disadvantages described in paragraphs 1 and 2 are eliminated by connecting the smoke exhauster with a controller that controls the impeller speed and water jacket temperature. Electronic units can be purchased at a price of 50-100 USD. e.

Blowing machines always work in conjunction with a controller, so the problems listed above are absent:

• the blower changes performance and turns off at the command of the control unit, the coolant heats up to the set temperature;
• during the combustion process, the ash pan door is hermetically closed, air is supplied through a separate channel;
• when there is a power outage, the air channel is automatically closed by a gravity damper;
• the impeller blades do not come into contact with hot smoke and soot.

Reference. In pyrolysis boilers, pressurization is always used, since the operation of this type of heater is based on forced air injection.

Now let’s compare the cost of a traction fan and a blower fan, not taking into account the price of the controller. A smoke exhauster for a TT boiler up to 30 kW will cost 90 USD. e., supercharger – 60-65 cu. e. The difference is due to design features exhaust unit - hot gases should not overheat the electric motor, plus the impeller is made of metal (when pressurized, it is made of plastic).

The installation complexity of the units is approximately the same. Installation of the discharge volute involves cutting out an opening in the ash pan door, and the smoke exhauster involves disassembling or cutting out the pipe. It is easier to install a roof hood, but you will have to pull a long cable.

Brief conclusion: install a smoke exhauster only if necessary, or better yet, correct mistakes made during the construction of the flue. Add electronically controlled turbocharging as desired - the system will automate and secure the combustion process.

How to make an exhaust unit

The main difficulty in assembling a smoke exhauster with your own hands is making a balanced impeller; the remaining parts are not difficult for a home craftsman who knows how to weld. If the impeller blades vary in weight, normal fan noise will turn into rumble due to vibration.

In addition to the blades, you will need the following elements:

• engine electric power up to 150 W, maximum shaft speed – 1400 rpm;
• snail or homemade box shown in the drawing;
• shaft with ventilation holes or an additional cooling impeller;
• studs with M8 nuts and other fasteners;
• power cable.

We offer ordinary homeowners the least thorny path - buy a factory electric motor with an impeller and a cooling impeller, weld the box and assemble a fully functional duct smoke exhauster for a TT boiler. How to do this correctly, watch the video.

Conclusion

Creating an artificial vacuum using a smoke exhauster is rarely practiced in household solid fuel boilers. Technical solution leads to higher construction costs and creates operational problems. Before installing a draft fan on the chimney, remember what kind of fuel you used previously. If you plan to burn wet wood, agricultural waste or low-quality briquettes, forget about the smoke exhauster for the boiler; you will have to clean the impeller weekly. It is better to install a supercharger with a control unit.

High-temperature fans are used in baths, saunas, and fireplaces to maintain an optimal microclimate in these rooms, removing smoke and excess moisture from the air.

This class of hoods domestic fans characterizes stability when operating at extremely high temperatures; they cope well with their duties where other fans fail: at temperatures from 70 to 180 degrees Celsius.

Why is good sauna ventilation so important? The fact is that during soaring, up to a liter of sweat can be released from the surface of a person’s skin, which accumulates in the air and settles on the ceiling and walls. Breathing these fumes is not at all beneficial. Excess moisture must be removed after the session to prevent fungus from forming on the walls.

How to choose a fan for a sauna?

The heat-resistant fan has a reliable housing made of glass-filled polyamide or metal.

Pay attention to the operating temperature in the product data sheet: fans with an operating temperature above 100 degrees are well suited for baths and saunas.

By the way, there is also a so-called “permissible” temperature; it can differ greatly from the “working” temperature. The permissible temperature shows the limits, upon reaching which the product will not deteriorate, but not the fact that it will be able to function normally.

Since the humidity in the steam bath is quite high, it is desirable that the high-temperature fan have additional moisture protection electrical elements(IP protection class).

It is good that the sauna fan can operate in two modes. While steaming in the sauna, it operates at minimum power to avoid unnecessary drafts and electricity consumption.

As soon as the vaping is completed, the fan turns on at full speed and removes moisture accumulated in the room to prevent the formation of mold and mildew.

Draft is the natural movement of air from a heating unit into the external environment when removing fuel combustion products from the residential area. The process of burning fuel in a furnace depends on its strength: if it is insufficient, the fuel will burn slowly; if the draft is too strong, a significant part of the thermal energy will be released into the atmosphere.

Lack of draft is also dangerous because some of the combustion products can enter the living space, causing serious poisoning among residents, even death. In addition, violation of the chimney exhaust conditions can cause a fire. The temperature of the flame when burning soot is such that even heat-resistant bricks burn out.

Controlling the hood is an indispensable condition for safe, comfortable living in the house.

Poor hood - reasons

Before we talk about the use of forced draft devices for chimneys, let us dwell on the essence of the process, as well as the reasons for the drop in draft in the pipe.

A set of factors influencing the efficiency of the hood chimney, can be divided into three groups:

1. Internal conditions in the house;
   • Conditions for the movement of air flows indoors.
   • Air temperature in the heated zone of a residential building.
   • The total volume of air inside the premises, which are connected to the combustion chamber of the furnace through the ash pan.
   • The number of other oxygen consumers living in the house - people or animals.

The draft of the chimney can be influenced by side factors that depend on the design of the house, as well as the changes made to it. For example, installing double-glazed windows instead regular windows leads to a drop in traction force, since the latter are more airtight and reduce the flow of oxygen from the atmosphere into the house.

1. External factors:
   • Humidity and air temperature.
   • The size of the atmospheric pressure.
   • The activity and strength of rising air currents.
   • The intensity of inversion air currents in the direction from top to bottom.
   • Energy and direction of wind flows.

The combined effect of the above factors leads to constant changes in chimney draft; this process must be constantly monitored to ensure optimal removal of combustion products from stoves, fireplaces and other heating units.

The influence of the factors in the first section can be conditionally controllable when it does not concern a ready-made chimney. The factors indicated in the second section are absolutely independent, but you can easily adapt to them by using them to improve the hood.

The factors of the third section are completely dependent on the person and can be influenced starting from the design stage, and upon receipt of the finished hood, the shortcomings can be eliminated during repairs - installing a round liner inside the pipe, insulating the walls of the chimney, changing its external structure.

Preventing the condition of the chimney

To avoid the need to use means of forced exhaust of a chimney made of heat-resistant material, it is necessary to use preventive means to maintain it in working condition.

Since the main reason for reducing the intensity of flue gas extraction is the reduction in the passage of the pipe by soot accumulated on the walls, we will consider means of combating this phenomenon.

These methods could be:

1. Burning about half a tablespoon of naphthalene in the furnace firebox. Naphthalene vapors decompose soot into loose components, large ones fall inside the firebox and are subsequently removed with the ash, and small ones fly out through the pipe along with the furnace gases. This product cannot be used for smoke removal from a fireplace and for pipes of open hearths - it leaves a characteristic suffocating smell in the rooms.
2. From time to time, burn potato peelings in the firebox. They are pre-dried. Starch vapors loosen the soot deposit and it will fall into the firebox. Pure starch acts similarly, which is fed into a well-lit firebox in the amount of one tablespoon.
3. A good way to remove soot from pipes is walnut shells. It burns at a high temperature, burning off soot deposits on the inner walls. A single dose of shells should be no more than three liters. Frequency of application - as accumulation occurs.
4. Aspen firewood has a similar effect on soot. One or two logs are burned at the end of the last stack of firewood. They burn at high temperatures.

The frequency of use of high-temperature products should be regular, at least twice a week, so that soot does not have time to accumulate. Otherwise, you can cause a serious fire, since the soot burns and releases a very large amount of heat.

In addition to those listed, there are many anti-soot agents on the market for both chemical and thermal decomposition of soot. The use of preventive measures can eliminate the need for forced measures to improve the exhaust hood on the chimney.

Forced exhaust by additional means

The need to install additional means of forced exhaust may arise for natural reasons, for example, trees have grown on the site, which has changed the direction or intensity of wind flows.

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You can, of course, rebuild the house or redo the chimneys, but this path is very expensive and labor-intensive. Easier and cheaper to use devices forced ventilation. To improve the hood, the following additional devices are used.

Weather vanes or wind vanes for forced draft

This is a device to protect the chimney from wind. Its principle of operation is that, like any weather vane, it turns in the wind, protecting the head of the chimney from the wind flow. Flowing around this device, the wind itself creates a vacuum above the mouth of the chimney, thus creating a forced draft of the chimney.

The heat-resistant material for the manufacture of such a weather vane is usually stainless steel with a thickness of 0.5 millimeters. Rotation around the axis occurs on support bearings closed type that do not require maintenance. There is no condensation and no soot deposits on the device body.

However, it requires maintenance to clear the ice. The disadvantages of the design include unstable work in strong winds. Under normal conditions, the vane fan operates steadily and efficiently, creating forced draft inside the chimney.

Rotary turbines for forced draft

These are mechanical devices installed on the chimney and use wind energy to produce rotation. Produced by industry under the name Turbovent, Turbomax and others. The direction of rotation does not depend on the direction of the wind. Thanks to the design - a ball formed by a system of petals, the turbine rotor reliably protects the chimney outlet from contamination by debris and leaves, as well as from nesting birds during breaks in the heating season.

The disadvantage of rotary turbines is that they do not operate in calm weather and continue to rotate when there is no need for this - during the non-heating period. Often used for ventilation devices.

Smoke exhausters or smoke fans

These devices are heat-resistant fans installed in the chimney duct to forcefully increase draft. A smoke exhaust fan should not be confused with fireplace fans, which are designed to increase draft in a fireplace or hearth and are installed in a room to supply air to the firebox. Fireplace units are designed to distribute heated air evenly in a room.

The smoke fan is a 220-volt electric motor with an impeller. It is designed to create additional draft forcibly inside smoke channels from a fireplace with a reduced cross-section.

Now there are new models of smoke exhausters in combination with a turbovent. In such a unit, it works in the absence of wind, and when the wind rises again, the smoke exhauster turns off. When the wind speed is insufficient or absent, the fan turns on and creates the necessary draft forcibly.

High-temperature chimney fans can easily withstand heating of furnace gases up to a temperature of 600 degrees.

Deflectors

The chimney deflector is a device that operates using the laws of aerodynamics. When air flows around the deflector body, a vacuum of air is created above the mouth of the chimney, due to which the exhaust is forcibly enhanced.

What is simple is perfect. This statement applies entirely to deflectors. Side horizontal wind and air flow reflected from the roof surface increase the draft of the smoke channel. Deflectors prevent the draft from tipping over strong wind, acting as a smoke exhauster for the chimney, but in calm weather they do not work.

Deflectors were originally developed for ventilation systems, but then they began to be successfully used as draft amplifiers in chimney hoods. Stainless steel products resist corrosion and successfully withstand high temperatures furnace gases.

In the absence of wind, the deflectors act as caps, reducing the chimney draft.

Umbrellas, chimneys and hoods for forced exhaust

Smoke umbrellas, caps with skirts made of debris mesh, fungi and other superstructures over chimneys are the subject of creativity of blacksmiths and tinsmiths. Of course, they successfully cope with the protective functions of the chimney, preventing clogging with debris. But any of such devices becomes an obstacle to the exit of hot gases from the chimney and, if certain conditions, especially in calm weather, reduce the amount of thrust and may be one of the reasons for its capsizing.

How to make forced exhaust yourself

Most weather vanes and deflectors can be made independently using sheet steel and ordinary fasteners. The calculation procedure for linking to pipe sizes and drawings of these products are abundantly presented on the Internet. To make it yourself, you do not need any special tools or devices, and an average level of plumbing skills is sufficient.

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From the foregoing, we can draw an unambiguous conclusion: not every device is suitable for improving draft in a chimney. When deciding on a method to improve traction, you must adhere to the following rules.

Inspect the chimney to determine the causes of insufficient draft. These could be:

1. Clogged chimney walls a large number soot
It is precisely this circumstance that can worsen draft up to the point of complete obstruction of the chimney of a gas boiler. The reason may be the use of firewood from resinous wood for heating, waste from furniture production (plywood, chipboard, fiberboard and the like). Cold chimney due to lack of pipe insulation.

2. Excessive number of chimney turns (one turn and no more than two bends are allowed). You may need to take it outside and install a wall-mounted version. It is also permissible to use a chimney fan.

3. Incorrect elevation of the head above the roof ridge, as a result of which the draft is “pinched” by air currents.

4. Chimney height. The distance from the firebox to the upper end should not be less than 5 meters.

5. There are no trees near the house to block the flow of wind.

Only after making sure that there are no such obstacles can you decide to install a device to create forced draft.

The draft in the boiler chimney can be improved by installing a round liner inside a square or rectangular pipe. Such products are produced purposefully and can be purchased at construction market. If the resulting cross-section is not enough for good draft, you can install a duct exhaust fan inside for a round chimney of suitable diameter.

It is not advisable to use deflectors as a smoke exhaust for a stove chimney if the climate has many windless days. At the same time, the weather vanes at least do not interfere with the escape of smoke by natural draft.

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For any case, a heat-resistant chimney fan installed in its duct will be effective.

Draft is the natural movement of air masses from any heat generator into the external atmosphere along with the removal of hazardous combustion products. If it is weak, the fuel will burn very slowly. It can also have a detrimental effect on the human body - gas pollution in the room in some cases leads to death. To create forced air circulation, install a chimney fan.

Methods for measuring traction force

If there is any doubt that the draft in the chimney from the heating device is weak, then you should definitely check it. Most in a simple way An examination using an anemometer is considered. The normal indicator is a traction force of 10−20 Pa. The big disadvantage of such devices is that inexpensive devices have poor measurement accuracy. If the indicator is below 1 Pa, then they will show that the system does not remove combustion products at all. Professional devices are quite expensive. They are often used only by stove makers.

To check the chimney, you can use traditional methods:

How to install a smoke exhauster

Natural circulation of air masses occurs due to the difference between street and internal atmospheric pressure. The indoor temperature is much higher. Cold air presses on warm air from below, thereby removing it to an area with lower pressure, that is, to the street. Measurements in summer will be less accurate.

Causes of poor gas removal

Before we talk about using forced exhaust for a chimney, you should understand the process of removing combustion products. You also need to understand the reasons for the deterioration of draft in the chimney. All factors influencing this can be divided into three main groups:

1. 1. Indoor conditions.
2. 2. External factors.
3. 3. Chimney design.

Internal also includes the temperature and volume of air in the house, the number of oxygen consumers, and the conditions for the movement of air masses. The design of the house also affects draft. For example, installation plastic windows often impairs air circulation. This is due to the higher tightness of double-glazed windows, which reduces the volume of incoming oxygen.

TO external factors include the humidity of the air outside, its temperature, atmospheric pressure, wind flows, and the speed of flow of air masses. Because of all this, constant changes in draft in the chimney appear. Removal process carbon monoxide from furnaces and other heat generators should be constantly monitored.

Factors associated with chimney design include:

1. 1. Location of the structure. The chimney can be located outside near the wall or inside the room.
2. 2. Pipe length and number of turns.
3. 3. The quality of the surfaces of the inner walls of the channel. A large amount of soot narrows the chimney, which is the main reason for poor draft. It accumulates more actively on rough chimneys.
4. 4. How high is the smoke chimney relative to the top point of the roof?
5. 5. Heat transfer from the materials from which the chimney is made. Insulated structures contribute to good traction.

Turbo deflector or electric fan? What to choose? Exhaust ventilation. Supply ventilation

All these factors completely depend on the person. At the design stage, all possible problems can be taken into account. If the structure is already ready, then the deficiencies are eliminated during repairs.

Preventive measures

To avoid having to use any means to artificially increase traction, you need to periodically carry out preventive measures. This will keep the chimney in good condition. The main reason for the deterioration in the circulation of air masses is the narrowing of the diameter exhaust vent. Ways to combat this phenomenon:

Backdraft in the chimney

It is required to use high-temperature materials regularly (at least 4 times a month). This will prevent soot from accumulating in the smoke exhaust ducts. If preventive measures are not taken, a serious fire may occur, since ash releases a lot of heat during combustion.

You can also find specialized products on the market. They work on the principle of thermal or chemical decomposition of soot. Thanks to regular preventive measures you can do without a chimney hood.

The need to install equipment for forced circulation air pollution sometimes occurs due to some natural reasons. For example, trees on garden plot could have grown significantly, causing the direction and strength of wind flows to change. Of course, you can redo the chimney, but it is very expensive and difficult. It is better to use a forced draft for a fireplace or stove to create normal draft.

Types of amplifiers

Deflectors are aerodynamic devices that are necessary to deflect air flow. They allow you to change the traction force in any direction. The principle of operation of the fan is to suck in air and redirect it to the smoke exhaust channel. The big disadvantage of the device is that the deflector is completely useless in calm weather.

The most popular devices are the designs of Wolpert and Grigorovich. Now on the market you can find more modern models, made on the basis of prototypes. The most common designs are::

1. 1. Multi-tiered.
2. 2. Round nozzles.
3. 3. Star-shaped.

When choosing such a device, you should pay attention to the material from which it is made. It is advisable that it be stainless steel, as it has high level strength and long lasting service life.

A chimney rotary turbine is a mechanism that must be installed above the chimney. The principle of operation may be a little like a fan, because the device uses the force of the wind to create high blood pressure in the design. Among the advantages, it is usually highlighted that the turbine protects the chimney from precipitation. The device is unable to perform its functions in calm weather.

Fireplace fan

The fan must not be installed to remove combustion products from conventional stoves. The maximum permissible gas temperature is 250 degrees. These requirements are standard.

Chimney weather vanes are used to protect the chimney on the leeward side. Such devices withstand the effects of precipitation well, have a long service life, and also have defense mechanisms for the channel. Weathervanes also have some serious disadvantages:

1. 1. They can't handle hurricane force winds.
2. 2. They need to be lubricated regularly.
3. 3. They require constant cleaning to remove carbon deposits.

There are also special heat-resistant fans called smoke exhausters. They operate on electricity, and it is recommended to install such devices only in narrow channels. The devices are capable of solving problems with weak and reverse draft. No significant shortcomings were noticed. The smoke exhauster functions well in any weather.

Making a device yourself

Often people try to solve the problem of insufficient traction by creating some devices themselves. This, of course, is a rather labor-intensive process, but it saves money.

To work you will need the following tools:

First you need to create a diagram of the future device. You can do this yourself or learn from those who have already done this. Then it is necessary to very accurately apply all the dimensions to the galvanized sheet. The following steps should be performed in this order:

The creation of the weather vane is complete. The device is attached to the chimney using self-tapping screws. We should not forget that such structures require careful maintenance. Periodically you need to clean them of soot and deposits.