High-temperature heat-resistant fans for a bath, a sauna, a fireplace. Effective ways to increase chimney draft Do-it-yourself high-temperature chimney fan

for fireplaces and wood stoves can be applied various fans which can withstand temperatures around +150°C. Such fans, in addition to temperature, must be resistant to aggressive gases that accompany smoke and are always present in combustion products.
An example of such high-temperature fans is the MMotors BK 200 duct fan for fireplaces with a maximum operating temperature of +150ºС. Considering that the temperature of the gases in the chimney fluctuates from the exit from the combustion chamber (near the fireplace to +1000°C) and drops towards the exit from the chimney (in the zone of exhaust from the chimney no more than +80°C), it is recommended to install a high-temperature fan as far as possible from the chamber combustion. This will prevent it from burning out and provide additional draft in the chimney.
In fireplaces, cold air is often mixed into the chimney channel, which simplifies the use of fans for forced or additional removal of gases. But, if the temperatures of the removed gases are not known, it is recommended to install a high-temperature duct fan as close as possible to the chimney outlet.
In addition, there are special air heating systems that take the heated air near the fireplace and distribute it throughout different rooms. Such systems do not use hot smoke, but heated air can have a temperature of more than +60°C and conventional duct fans are not recommended for use at such temperatures. To create heating air systems, special fireplace fans are produced, which, in addition to resistance to temperatures, have high performance and high pressure values. It is the latter characteristic that allows you to effectively move heated air over long distances.

Traction is called natural movement air masses from any heat generator to the outside atmosphere along with the removal hazardous products combustion. If it is weak, then the fuel will burn very slowly. It can also adversely affect the human body - the gas contamination of the room in some cases leads to death. To create forced air circulation, install a fan for the chimney.

If there is any doubt that the draft in the chimney from the heater is weak, then a check should be made. Most in a simple way considered survey using an anemometer. A normal indicator is a traction force of 10-20 Pa. A 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 folk methods:

The natural circulation of air masses occurs due to the difference between outdoor and indoor atmospheric pressure. The room temperature is much higher. Cold air presses on warm air from below, thereby removing it to an area with less pressure, that is, to the street. Summer measurements will be less accurate.

Before talking about the use of forced exhaust for the 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. Indoor conditions.
2. External factors.
3. The design of the chimney.

Internal also includes the temperature and volume of air in the house, the number of oxygen consumers, the conditions for the movement of air masses. The design of the house also affects the traction. 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.

External factors include the humidity of the air in the street, its temperature, atmospheric pressure, wind currents, and the speed of the flow of air masses. Because of all this, there are constant changes in draft in the chimney. Removal process carbon monoxide from furnaces and other heat generators should be constantly monitored.

Factors related to chimney design include:

1. The location of the structure. The chimney can be located outside near the wall or inside the room.
2. Pipe length and number of turns.
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 cause of poor draft. On rough flue pipes, it accumulates more actively.
4. How high is the chimney relative to the top of the roof.
5. Heat transfer of materials from which the chimney is made. Insulated constructions contribute to good traction.

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

How to choose a chimney fan

You can endlessly look at three things, one of which is how the fire burns. Quite often, in the arrangement of private houses, many people use fireplaces. And someone is forced to use solid fuel boilers to heat the room in winter. In any case, it's all about fire. It creates comfort and provides warmth. However, where there is fire, there is smoke. No system can function without a chimney. It happens that they do not quite cope with their task and the smell of smoke is constantly present in the house. In this case, increasing the draft of the chimney with a fan will help. This is a forced withdrawal, which will have to be spent a little.

If you are faced with such a problem, then you may be interested in answers to such questions: what types of products exist, what is the difference between them, how to choose a chimney fan? We will consider all this further.

Hood deflectors

This is a fairly common option. forced ventilation. A deflector is an aerodynamic device that is installed above the chimney. It enhances the draft in the chimney by changing the air flow. The essence of its work lies in the pressure drop when air flows around an obstacle, as well as on the principle of changing air flows. It turns out that its shape allows you to increase the draft in the chimney. Made from stainless steel, they are corrosion resistant, acid and high temperature.

It cannot be called a full-fledged fan, since the deflector has a simple shape, without working mechanisms. But, there are varieties of smoke deflectors designed specifically for chimneys.

Volpert deflector.
Grigorovich deflector.
Round or spherical deflector.

In addition, weather vanes, umbrellas and similar structures are often installed on chimney pipes. But they can't do everything a high temperature chimney fan can do. Let's look at how they work and what makes them special.

smoke fan

The exhaust fan for the chimney is a heat-resistant electrical device. It is mounted directly on the chimney to increase the draft in the chimney. It is important not to confuse a chimney fan with a fireplace fan, which is needed to supply air to support combustion. Here the principle of operation is different. To put it simply, a chimney fan is an electric motor with blades that allow you to forcibly draw smoke out of the chimney and direct it to the street. For full operation of the fan, power supply from the 220V network is required.

In fact, a fan in the chimney to improve draft is somewhat reminiscent of a deflector, only wind force is not required for its operation. He works constantly, perfectly coping with his task. In addition, economical models can be found on sale. They work in two modes: when outdoors strong wind, then the rotation occurs naturally, without the use of electricity. And in calm weather, an electric motor starts. This perfect solution for the chimney.

Scope of use of chimney fans

Such devices have found applications in many areas of life. Fans are an integral part of the heating system. It is important to understand that a fully and properly functioning chimney is a necessity. This is the only way to not worry about your health and the health of your family members. By installing a chimney fan with your own hands, you will protect yourself and loved ones.

Here is where fans can be used:

when arranging a fireplace;
for the heating system;
when creating a sauna or bath;
for the forge.

Features of chimney structures

Since the smoke has a high temperature and constantly affects the structure, the chimney fan is made heat-resistant. The material is able to withstand temperatures up to 250 degrees. This is quite enough to serve faithfully for many years. Usually products are made of cast aluminum with a special coating. The motor has a lifetime bearing lubrication and is also heat resistant.

As for the types of fans, it all comes down to differences in their shape and power. After all, chimneys are different, respectively, you need to choose a device that would fit inside and have the shape of a chimney. These are the features of the choice of products for the chimney. Usually the design is made in a square or round shape.

Reviews of popular fans

MMOTORS JSC BO VO 90/25 T (+150°C)

Fine round shaped fan used for intermittent or long term operation. Its productivity is 60 m 3 / h, with a power of 16 watts. The product has an IP44 protection class. The landing diameter is 9.9 cm, and the depth is 2.5 cm. The fan produces 2.5 thousand revolutions. The product can be installed in channels with a small length. Thanks to the low-noise electric motor, which has double encapsulated ball bearings, the device will be able to work as much as 30,000 hours. The fan can be mounted both vertically and horizontally. The body consists of aluminum alloy which cools quickly and can withstand temperatures up to 150 degrees. Warranty - 3 years. The cost is about $38.

MMOTORS JSC BA VA 9/2 T (+150)

Unlike the previous version, the fan has a square shape, and as for the parameters, they are practically the same. Power - all the same 16 W, performance, protection class, speed and other indicators are the same. But the landing diameter is 9.3x9.3, with a depth of 2.5 cm. Warranty - 3 years, cost - $ 38.5.

MMotors WOK 150/120 (+150°C)

The fan is also used for a round chimney. It is much more powerful than the previous options. With a power of 18 W, the device has a capacity of 240 m 3 / h. Landing diameter - 12 cm. Protection class IP44.

The model has a different section along the fan axis, which allows it to be adapted to conventional air ducts. The material is heat-resistant, and the engine will last 30 thousand hours of operation. Manufacturer's warranty - 3 years. The cost is $90. Having bought such an exhaust fan for a chimney pipe, you can forget about weak draft.

Conclusion

The issue of increasing draft in the chimney is very important. Not only your comfort depends on this, but also your safety. Therefore, do not neglect the lack of a chimney fan in your home. It is better to spend money and buy a device than to constantly smell smoke in the room. It's safe to say that you won't regret your decision later.

Types and manufacture of chimney draft amplifiers

Decrease in draft can lead to the reverse penetration of combustion products into the room and carbon monoxide poisoning. To increase the traction force, special devices are used - amplifiers (stabilizers, fans, deflectors). You can buy them or make your own.

Reasons for reduced traction

Initially, it is necessary to examine the pipe for the fact of clogging with soot or other foreign objects (a clean chimney of the furnace, where the soot layer is not more than 2 mm). Then you should check the thrust with an anemometer and compare the indicator with the norm.

One of the factors affecting draft is incorrectly selected chimney metrics:

too large or insufficient diameter of the chimney of the furnace;
the length of the horizontal sections of the pipe or rotary elements;
the length of the pipe for the furnace is incorrectly selected;
chimney incorrectly located relative to the roof ridge.

The factors affecting the draft also include leaks in the chimney: lack of elements, fallen out bricks, cracks, gaps. They create additional circulation and air flow. Experts will tell you how to improve draft in the chimney, and you can also find a large amount of information on the methods and devices used on your own.

Ways to improve traction

Deflector installation. One of the common devices for raising the aerodynamic performance of the chimney is a deflector. The essence of his work is to create an effect low pressure(due to the rounded shape) at the time of the air flow around, compensation occurs due to the removal of combustible gases from the furnace pipe.

To make a deflector with your own hands, you will need several sheets of stainless steel 1 mm thick, grinder, welding machine, chimney diameter collar, heat-resistant sealant and other tools.

Schemes and drawings of the deflector can be found on the Internet, drawn or printed on paper and transferred to a sheet of metal. After you need to cut out the elements, bend into the desired design and weld at the joints. Using a clamp, the structure is attached to the top of the chimney pipe.

Installation of an automatic stabilizer. This chimney draft regulator maintains the optimum draft level by means of a damper or umbrella design when the pressure in the chimney increases. The stabilizer lowers it due to the additional air flow from the room. The stabilizer can be an element of a modular chimney system for stoves.

You can make an automatic stabilizer yourself, for this you will need stainless steel sheet 8-10 mm thick, steel bar, welding machine, grinder. Having prepared the stabilizer scheme in advance, cut out a piece of steel sheet and twist it into a pipe, then weld and grind the joint. After that, a hole is made for the limiter, equal to 15% of the diameter of the furnace chimney.

Two are made in the pipe through holes, in which a steel bar is placed, fix it on one side with screws, and on the other, leave 10 cm of its length and attach the handle. Then a limiter is welded, which will subsequently close the pipe opening. Install the stabilizer in the intermediate section of the chimney and use clamps on both sides.

smoke fan- a very effective way to create additional forced traction. The principle of operation of the fan lies in its location and rotation of the blades, which create a rarefied air area, where is going influx of smoke.

Often a fireplace brick chimney is installed, it is also used for stoves. The fan requires an additional electrical connection, given fact for safety reasons is not always possible.

Use a fan as a draft booster, relevant for narrow stove chimneys where the natural aerodynamic performance is very weak, there is a need to increase these performance. There are models of fans that, in addition to operating on electricity, rotate in strong winds due to mechanical rotation by the flow.

Hood deflectors

This is a fairly common version of forced ventilation. A deflector is an aerodynamic device that is installed above the chimney. It enhances the draft in the chimney by changing the air flow. The essence of its work lies in the pressure drop when air flows around an obstacle, as well as on the principle of changing air flows. It turns out that its shape allows you to increase the draft in the chimney. Made of stainless steel, they are not afraid of corrosion, resistant to acids and high temperatures.

Note! Despite its simplicity and low cost, the deflector is ineffective in calm weather. The device is not powered by electricity or other power source, but is completely dependent on the wind load.

It cannot be called a full-fledged fan, since the deflector has a simple shape, without working mechanisms. But, there are varieties of smoke deflectors designed specifically for chimneys.

Types of deflectors:

Volpert deflector.
Grigorovich deflector.
Round or spherical deflector.

It is the round deflector that can create rotational movements under the influence of the wind and remove smoke from the room. But, again, the minus of the product is that it is ineffective in the absence of wind. The principle of operation of this draft booster for ventilation pipes and chimneys is demonstrated in the video *

smoke fan

The chimney exhaust fan is a heat-resistant electrical device. It is mounted directly on the chimney to increase the draft in the chimney. It is important not to confuse a chimney fan with a fireplace fan, which is needed to supply air to support combustion. Here the principle of operation is different. To put it simply, a chimney fan is an electric motor with blades that allow you to forcibly draw smoke out of the chimney and direct it to the street. For full operation of the fan, power supply from the 220V network is required.

In fact, a fan in the chimney to improve draft is somewhat reminiscent of a deflector, only wind force is not required for its operation. He works constantly, perfectly coping with his task. In addition, economical models can be found on sale. They operate in two modes: when there is a strong wind outside, the rotation occurs naturally, without the use of electricity. And in calm weather, an electric motor starts. This is the perfect chimney solution.

Scope of use of chimney fans

Here is where fans can be used:

when arranging a fireplace;
for the heating system;
when creating a sauna or bath;
for the forge.

Features of chimney structures

Reviews of popular fans

To stop at specific models, let's look at the MMOTORS fan line, which are very popular. This is a Bulgarian product with a lot of advantages.

MMOTORS JSC BO VO 90/25 T (+150°C)

Fine round shaped fan used for intermittent or long term operation. Its productivity is 60 m 3 / h, with a power of 16 watts. The product has an IP44 protection class. The landing diameter is 9.9 cm, and the depth is 2.5 cm. The fan produces 2.5 thousand revolutions. The product can be installed in channels with a small length. Thanks to the low-noise electric motor, which has double encapsulated ball bearings, the device will be able to work as much as 30,000 hours. The fan can be mounted both vertically and horizontally. The body is made of aluminum alloy, which cools quickly and can withstand temperatures up to 150 degrees. Warranty - 3 years. The cost is about $38.

MMOTORS JSC BA VA 9/2 T (+150)

MMotors WOK 150/120 (+150°C)

Conclusion

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

Methods for measuring traction force

If there is any doubt that the draft in the chimney from the heater is weak, then a check should be made. The simplest method is considered to be an examination with an anemometer. A normal indicator is a traction force of 10-20 Pa. A 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 folk methods:

How to install a smoke exhauster

Reasons for poor gas removal

1. Indoor conditions.
2. External factors.
3. The design of the chimney.

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

External factors include the humidity of the air in the street, its temperature, atmospheric pressure, wind currents, and the speed of the flow of air masses. Because of all this, there are constant changes in draft in the chimney. The process of removing carbon monoxide from furnaces and other heat generators should be constantly monitored.

Factors related to chimney design include:

1. The location of the structure. The chimney can be located outside near the wall or inside the room.
2. Pipe length and number of turns.
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 cause of poor draft. On rough flue pipes, it accumulates more actively.
4. How high is the chimney relative to the top of the roof.
5. Heat transfer of materials from which the chimney is made. Insulated constructions contribute to good traction.

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

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

Preventive measures

In order not to have to use any means to artificially increase traction, it is necessary to periodically carry out preventive actions. This will keep the chimney in good condition. The main reason for the deterioration of the circulation of air masses is the narrowing of the diameter of the exhaust opening. . Ways to deal with this phenomenon:

Back draft 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 flue ducts. If preventive measures are not taken, a serious fire can occur, since the ash releases a lot of heat during combustion.

Also on the market you can find specialized tools. 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 air circulation sometimes arises due to some natural causes. For example, trees in garden plot could grow strongly, because of which the direction and strength of wind flows changed. Of course, you can remake the chimney, but it is very expensive and difficult. It is better to use a forced exhaust for a fireplace or stove to create a normal draft.

Types of amplifiers

Deflectors are aerodynamic devices that are necessary to deflect the 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 flue duct. The big drawback of the device is that the deflector is completely useless in calm weather.

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

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

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

A rotary chimney turbine is a mechanism that must be installed above the chimney. The principle of operation may be a bit like a fan, because the device uses the power of the wind to create high blood pressure in construction. Among the advantages, it is usually distinguished 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 ovens. The maximum allowable gas temperature is 250 degrees. These requirements are standard.

Chimney weathercocks are used to protect the chimney from the leeward side. Such devices tolerate the action of atmospheric precipitation well, have a long service life, and their design also has protective mechanisms for the channel. Weathercocks also have quite serious drawbacks:

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

There are also special heat-resistant fans called smoke exhausters. They are powered by electricity, and it is recommended to mount such devices only in narrow channels. Devices are able to solve problems with weak and reverse thrust. No significant deficiencies were noted. The blower works well in any weather.

Making a device with your own hands

Often people try to solve the problem with insufficient traction by creating any devices on their own. This, of course, is a rather time-consuming 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 peep from those who have already done this. Then it is necessary to accurately apply all dimensions to the galvanized sheet. The following steps should be performed in the following order:

The creation of the weather vane is completed. The device is attached to the chimney using self-tapping screws. It should not be forgotten that such structures require careful maintenance. Periodically, you need to clean them from soot and soot.