No draft in the chimney. Reverse draft in the chimney: what to do and how to fix the situation

So what is traction? This is if you say scientific language, aerodynamic directed air flow of flue gases in any exhaust structure. This phenomenon occurs due to the fact that the wind is also a matter of the difference in air pressure inside the furnace and outside, air masses always tend to where there is the least resistance. And speaking in simple terms, reverse draft in the chimney - this is when the air flow of gases leaves the burning wood not into the chimney to the outside, but back into the room. There is also the term “thrust overturning” - and this is when the direction of air flow on a short time changes to the opposite.

You will be surprised, but tall buildings or trees standing nearby, and if the height of the chimney is below the roof ridge, can lead to draft problems. There are many factors, so let's figure out together why exactly you have such a problem and how to improve chimney draft once and for all.

How to understand if there is a reverse thrust?

It's easy to notice the first signs of problematic draft - if the wood in your stove is burning with large quantity smoke, the glass on the door is instantly smoked and when the door is opened, the smoke will immediately fall into the rest room - the draft is too weak. And if you do not figure out how to increase the draft in the chimney, it will soon become not only bad, but also reverse.

You can check the draft force in the chimney in the following simple ways:

Toilet paper - exactly how it is deflected.
Direction of smoke from a cigarette.
The appearance of smoke in the room is already a reverse thrust.
The hum in the chimney and the white color of the flame - the draft is already too much.
The yellow-golden color of the flame is good traction.

V Soviet time there was even a special device to measure the draft in the chimney - an anemometer. According to it, certain objective data were obtained if the wind speed was more than one meter per second. Today, more modern devices are already being used that measure the draft of the chimney in units of pressure - which one is at the base of the chimney, and which one is at the top. They cost a lot, but if you can’t solve the problem with traction, it’s better to buy.

Why does this effect occur?

Where does it come from and who is to blame? Well, the most common cause- This is an error in the design of the chimney. Further, no less popular "culprits" are debris in the chimney, strong air currents in the pipe, and even a certain influence of atmospheric phenomena.

Reason #1 - Chimney Design

First of all, the design of the chimney itself matters - at too high a draft is always strong, and at a low one it is often insufficient. Optimal length- a little over 5 meters, then problems with traction rarely occur and certainly not because of the height of the pipe.

Also, the cross-sectional area of the chimney must correspond to the furnace - with too small cross-sectional dimensions and at the same time with a powerful furnace, a large volume of combustion products simply cannot leave normally, sufficient traction is not created. As well as a disproportionately large chimney, it will lead to the fact that all the heat, as people like to say, "will fly out into the chimney." And in no case should pipes of different diameters be installed at the chimney in different areas - there will be soot and draft problems.

A serious obstacle to the movement of smoke is also uneven surface pipes - any deposits reduce the diameter of the pipe, and it is more and more difficult to melt the furnace each time. Tilt angles with turns of the chimney also create their own difficulties - if soot constantly accumulates in the corners, it will also interfere with normal draft. To avoid this, when designing, adhere to standard norms - 45 ° bend, 90 ° turn.

The very shape of the smoke hole is also important: round is the most favorable for good traction, but with square and rectangular, problems often arise. So, in these corners, there is an additional twist at the corners, which slightly interferes with the overall flow and in total reduces traction.

By the way, the most common problem poor draft - in metal chimneys. Their trouble is that they quickly heat up, but also quickly cool down, and cold air always sinks down. Good old brick chimneys are more reliable in this regard.

Reason # 2 - violation of ventilation

Also, the lack of ventilation in the room where the stove is heated can lead to such a misfortune. Check for drafts - are they too strong? Such whirlwinds right in the room can "confuse" the direction of the smoke, no matter how strange it may sound. By the way, intense air currents in the baths often arise because of the stairs to the second floor. Watch this, and never open windows on landing if it is much higher than the level of the firebox.

Also pay attention to ventilation if you have a geyser in the boiler room. It will still draw air from the combustion room, over time a serious lack of oxygen will form and a critical air rarefaction will occur. From time to time, a stream of air will rush through the chimney, the column will go out, and the room will smoke. Do you have such a situation? Still deaf-tight plastic windows cost? Urgently deal with the issue of ventilation.

Reason #3 - external factors

Smoke can also get into the room due to high humidity on the street or strong wind. Or when the street is already clearly warmer than in the house - all the same pressure difference. If you have a reason for this, you will certainly hear bad smell burning Just open the window then and ventilate well, let the temperatures even out a bit.

And very rarely, but it happens that the reason why there is no normal draft in the chimney is the wind, which causes turbulence above the roof - if nearby buildings are located in a special way and there are too branched trees nearby. Or the head is incorrectly directed in relation to the roof ridge - and this happens.

And, finally, the fact where exactly you have a chimney plays a role. In the inner part of the bath, it has a good effect not only on the heating capacity of the system, but also makes it possible to maintain strong traction even in cold weather. And here is the outer one, which runs along outer wall, warms up for a longer time and condensation often forms in it.

How to solve the back thrust problem?

An item such as a deflector will help to cope with reverse draft - this is a mechanical fan, the task of which is to suck smoke from the chimney shaft. See also how it also costs, with the help of which the traction is just regulated. One damper is in the chimney channel, the second is usually either in the oven or in its door. Play with their position - this is a kind of draft booster in the chimney and the problem is solved in 99% of cases in this way.

Sometimes reverse thrust occurs as a temporary option - only for a day or two. For example, if you have not used the stove for a long time, and then, due to damp, cool weather, you decide to melt it. But heavy cold air has already accumulated in the stove and in the chimney, which will immediately begin to prevent the creation of traction and the smoke will go into your living room. And what to do with the intermittent reverse thrust? It's simple: identify the cause and eliminate it. And for safety, use another draft stabilizer for the chimney - this is a secondary air supply device, so that the force of air movement through the chimney is optimal. The stabilizer has a safety valve, which in case of emergency will prevent the occurrence of too much pressure.

Plain paper will help get rid of cold air in the chimney after a long break in kindling - burn a couple of sheets, slightly heated air will rise through the pipe and push out the cold. After that, already melt the oven - there will be no problems.

And finally, clean the chimney in time - and if it is possible for him to install a pipe tee for cleaning, do not neglect it. We hope that by the end of reading this article you have already found the cause of reverse thrust, for which we congratulate you!

Many have conventional ovens or various furnace chimneys in houses, cottages or summer arbors, but not everyone knows how to properly monitor them, and what to do when there is no draft in the chimney.

Traction is one of the most important parameters chimney. It depends on it how well the combustion products harmful to health will be removed from the unit. It is evaluated based on the speed of movement through the chimney. Its quality depends on:

internal section of the pipe;
roughness of internal coatings;
temperature difference between air and combustion products.

Sometimes back draft can occur in the chimney of the stove.

Signs that there is a backdraft in the chimney

If you have a similar problem, it is very easy to notice its first signs: a large amount of smoke will occur in your stove, the glass will be constantly smoked, and when you are, the smoke will immediately go into the room. In case of untimely elimination of problem traction, it can develop into a reverse one. There are several valid verification methods:

With toilet paper. With reverse thrust, it will deviate in your direction, and with normal thrust, it will deviate in the opposite direction.
By the color of the flame. If the flame has White color , then it is too strong, but if the flame is yellow-golden, then it is normal.
Via a special device that measures thrust at the base of the stove chimney and at the end. These devices have a minus - they are very expensive.

Causes

The most common cause of this problem is the incorrect design of the stove chimney. High chimneys always have strong draft, and low ones - insufficient. The best unit is pipe length 5.5 meters.

Read also: Cleaning the chimney in the sauna stove

It is necessary to pay great attention to the cross-sectional area of \u200b\u200bthe pipe. It must correspond to the power of the heating structure.

It must be remembered that it is strictly forbidden to make pipes with different diameters at the chimney - many problems will appear: soot on the windows, soot, excessively strong or weak draft. Rough or rough internal coating chimney is also big problem, which is essential slows down the movement of smoke through it. Any residue in the form of soot, ash or other dirt gradually reduces the cross-sectional area of the chimney, and as a result, the furnace fire becomes more difficult every time.

The presence of chimney slopes and sharp corners also undesirable: they create additional obstacles for normal traction. If ash, soot and other dirt constantly accumulate in the corners, the smoke will not be able to exit normally. This means that the pull will be slower. In order to avoid this, experts recommend adhering to standard norms: the retraction should be 45° and the turn 90°.

Fireplace in own house is the dream of every romantic. Which of us did not seek to be in the winter evening cozy armchair at your own fireside, to blissfully absorb the warmth spread by living fire with your whole body.

But the smoke that fills the room and does not want to go into the chimney does not fit into this idyllic picture. Reverse thrust in the chimney - this is the name of this unpleasant phenomenon. Why does it occur and how to deal with it? We have collected information about this for you and provided it in this article.

We also paid attention to ways to check the draft in the chimney and examined in detail best options solve the traction problem.

Before understanding the causes of this phenomenon, you should understand the essence of what is happening. The heating device installed in the house, together with the chimney, form an exhaust structure.

The air pressure inside and outside the device is not the same. Because of this difference in pressure, thrust arises - an aerodynamic directed flow of flue gases.

Safe and efficient work heating device assumes that the products of combustion will move from the burning fuel along the smoke exhaust paths. The air masses in the chimney have a lower density, as a result of which they tend to rise. In their place, colder outside air enters. This is exactly what the flow change should ideally be.

Backdraft is not only an unpleasant, but also a dangerous phenomenon, the consequences of which can manifest as a deterioration in the health of people and pets.

But sometimes there is a phenomenon called reverse thrust. In this case, the smoke resulting from the combustion of fuel is not directed outside through the chimney, but inside the room.

The occurrence of reverse thrust is not only an unpleasant, but also a dangerous phenomenon. The penetration of combustion products into the room leads to serious poisoning, and carbon monoxide poses a mortal danger.

The first signs of a failure in the movement of air masses can be not only smoke entering the room, but also a quickly smoked glass window in the firebox door. At first, the craving may just be weak, but if you do not take action, over time it will become reversed.

Sometimes there is another phenomenon associated with the movement of smoke - the air flow for a multiple time changes its direction to the opposite. This is how the pullback occurs.

Causes of reverse thrust

There are several reasons for reverse thrust to occur. The main one can be considered the mistakes made in the process. Perhaps, during its construction, the rules for the use of building materials were violated.

This kind of problem will not arise at all if the chimney is designed in accordance with existing standards: the turn must be done at 90 °, and the outlet should be at an angle of 45 °. Particular attention should be paid to the cross-sectional shape of the chimney.

most suitable form is a circle. If corners are present in the design, turbulences may occur that prevent the removal of gases.

The profession of a chimney sweep, as you can see, has not yet lost its relevance, and, with an increase in the number of private cottages, it has even become even more in demand.

If we compare brick and metal chimneys, then the draft in the latter will always be of lower quality. The problem is that the metal heats up quite quickly, but it also cools down just as quickly. And cold air, as you know, goes down.

Common reasons include the following reasons why there is no draft in your chimney:

Chimney obstruction. It may very well be that it is simply clogged with debris or smoked as a result of long-term operation. Rapid smoking can also occur if the chimney is made up of pipes different diameter. Under no circumstances should this be done.
Mistakes in calculation. Miscalculated cross section smoke passage. Quite often, when designing a structure by non-specialists, there are disproportions in the dimensions of the elements of the device: the combustion chamber and the chimney. A powerful stove, for example, can produce a greater volume of combustion products than a narrow chimney can carry. Therefore, you need to carefully follow.
Design errors. The height of the smoke extraction system is insufficient for its effective operation. Short chimney lengths can cause insufficient pressure differences. Optimal Height the chimney pipe is five to seven meters.
Narrowing of smoke channels. There are narrow and horizontally directed sections in the smoke evacuation paths. In such places, soot accumulates especially actively, which prevents the free movement of smoke.
Wind support. The chimney is located in the "wind backwater" area. The cause of backwater can be, for example, a tall building located next to the chimney.
Incorrectly organized ventilation of the room. The lack of ventilation or its illiterate device leads to the lack of the required volume supply air. Therefore, it is important to give Special attention in a private house.

If the ridge of the roof is located above the level of the chimney, then the overturning of the draft can occur when a strong wind occurs.

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Option # 2 - a special gate valve

If you have problems with the stove, you should check the position of the gate. A gate is a damper that is designed to adjust traction. It is usually installed on the uninsulated first meter of the chimney pipe. This flap allows you to do the job heating equipment as efficient as possible.

This device has several functions:

after the fuel burns out, it is used to block the pipe, which allows you to save heat for a long time;
as a draft regulator, the damper is used to change the section of the chimney: with excessive draft, for example, the smoke channel can be narrowed;
with its participation, it is possible to control the quality of fuel combustion.

The material for the manufacture of the gate is, as a rule, stainless steel, the thickness of which is 1 mm. Thanks to the polished surface of the product, soot is easily removed from it.

The temperature that such a valve can withstand does not exceed 900 ° C. It is quite strong and has a low coefficient of thermal expansion.

The retractable damper should not completely block the chimney outlet: 85% is the indicator that ensures safety standards for the operation of heating appliances

The gate is available in two models:

horizontal retractable plate, which is most often used in brick chimneys;
rotary valve or butterfly valve.

The throttle valve is called the same plate, which is fixed on a rotating axis placed inside the chimney or pipe.

The contours of the rotary damper plate repeat the cross section of the chimney, which allows it to almost completely block the pipe when the heater is not working

In view of the simplicity of the design, it is easy to do it yourself. Such a homemade product in operation will be no worse than a purchased product.

Option # 3 - chimney stabilizer

A product with such a speaking name is otherwise called a breaker. This is a mechanism that automatically and dosed air into the chimney, allowing you to optimize the operation of the heating system without involving a person in it. To prevent overpressure, the breaker is equipped with a safety damper.

For the production of a chimney draft stabilizer, stainless steel is used. The maximum temperature that this device can withstand is 500°C.

The draft stabilizer installed on the chimney must be adjusted in accordance with the recommendations that you will find in the instruction manual for your heating boiler

The essence of the stabilizer is that with its help, cold air is automatically added directly to the chimney. At the same time, the temperature and velocity of gas movement inside the pipe are reduced. As a result, the efficiency of using the burned fuel is increased without any changes in the mode of operation of the heater itself.

The breaker is installed, as a rule, on the chimney pipe. However, the distance from it to heater(boiler) should be at least 0.5 meters. The breaker should only be located indoors.

Since its operation is based on a system of precisely balanced weights, the influence of natural factors on the operation of this device must be excluded.

The adjustment of the stabilizer can be considered completed when the value of the minimum thrust is set on its regulator in accordance with the data specified in the operating instructions for your heating boiler. You should set either the exact parameter or a division higher than the recommended one.

In addition to the use of the above devices, to prevent back draft, you can lengthen the chimney pipe, straightening it as much as possible. Bends and sharp turns of the shaft increase cavitation when removing gases to the outside.

Conclusions and useful video on the topic

If a draft problem does not manifest itself in puffs of smoke in all rooms, this does not mean that it does not exist. A device will help to identify it, the device of which can be found by watching this video.

This product may save your life by drawing attention to the problem in time, since carbon monoxide, for example, has neither color nor smell.

This video contains information about appearance deflector TsAGI and its constituent parts. You can see how to build this fixture yourself.

If you feel the strength to self-manufacturing traction stabilizer, then this video will be a real guide to action for you.

Any device that functions in your home must work properly and not create a threat to life and health of people during its operation. Heating in this sense is no different from others. useful devices. The deflector, gate and stabilizer will help make its work stable and efficient.

Do you have a chimney draft problem and are trying to fix it on your own? Did you find the answers after reading our article? Or do you still have unresolved issues that we missed? Feel free to ask them in the comment block, and we will try to clarify these points.

Our grandparents also knew about the concept of reverse thrust. In almost every private house with a stove in winter, one could observe how men smoke near the firebox, and all the smoke goes into the stove, and not into the house. With the advent of modern gas heating equipment, the problem has not disappeared. Very often there is a reverse draft in the chimney gas boiler or columns. In order for the heater not to deteriorate and function properly, it is necessary to familiarize yourself with nature this phenomenon.

The occurrence of reverse thrust

Draft is the directional movement of air through a chimney or other channel. From the school bench, we know that such a movement is due to temperature differences or differences atmospheric pressure, since the density warm air less than cold, and there is such a thing as draft, forcing air currents to move.

If such a process is carried out without the help of additional devices or devices, then it is called natural draft. When the air flows turn around and begin to move in the opposite direction, a reverse draft occurs in the chimney. What to do in such situations depends on many conditions. First of all, it should be understood that rarefaction occurs due to the presence of sources in the room. natural ventilation. To avoid smoke in the room, it is useful to know exactly how much air leaves the room, because the same amount should enter it. With proper operation of the draft, it can be easily controlled, reducing heating costs and improving the quality of heating.

Interestingly, even with correct device chimney in a private house, a short-term occurrence of reverse draft, called tipping over, may occur. The reasons are most often adverse weather conditions, and the effect does not last long.

Thrust Definition

At the beginning of each heating season Before starting the boiler or furnace, check whether there is a backdraft in the chimney. What to do for this? Of course, there are special devices for measuring thrust, but they are very expensive and are available only from specialists.

From the experience of generations, it is known that the draft in the furnace should be checked with the help of a flame. To do this, a match is lit and brought to the firebox. If the flame draws into the furnace, then the draft is good, and you can begin to melt the room. When the fire is not moving, there is no draft at all, and if the flame blows into the room, then the draft in the chimney is reversed. What to do when starting gas boilers? Open fire must not be used. You should check where the smoke is drawn by tilting a thin strip of paper.

The color of the burning flame can also tell about the amount of thrust in the furnace. Ideally, it should be golden. If the color is red, then the fire does not have enough oxygen for normal combustion, and if a rumble occurs during the firebox, one can judge about excessive exhaust.

This process is influenced by a large number of factors. The main one is the incorrect design of the chimney at the construction stage. In order not to face the problem of insufficient or incorrect traction in the future, it is necessary to correctly calculate in advance:

chimney section size;
its location;
material of manufacture;
form;
pipe height;
the presence of additional devices that increase traction.

The number of people or devices consuming oxygen in the room also affects the quality of air movement. The latter include heaters, irons, stoves and so on. Important for correct operation and regular ventilation.

A person can control all this on his own, therefore, the presence of reverse draft in the chimney depends only on him. What to do if the weather influences traction? It is impossible to control them, but it is quite possible to resist them.

The main reasons for adjusting air flows

From the foregoing, it is clear that rarefaction of air is only a consequence of weather phenomena or human actions, therefore, the elimination of reverse draft in the chimney begins with exact definition the reasons for its occurrence. The main one is the wrong design of the whole heating system and fume extraction. In this matter, it is important to pay attention not only to calculations, but also to the selection of material. For the chimney of the furnace, it is better to use ceramics or bricks, but for boilers or geysers will be ideal metal pipes. In addition, the cause of reverse draft in the chimney of the furnace may be hidden:

in the clogging of the chimney;
in the presence of narrow sections in the smoke passage channel;
the location of the chimney in the channel "wind backwater";
in violation of natural ventilation;
under adverse weather conditions.

By the way, availability depends on the weather outside. right flows air, even if all the rules for arranging the chimney are observed. Thrust tipping occurs especially often in strong winds, high humidity air or high temperature outside the window. This is true when using a gas column in the summer.

In any case, if such a phenomenon occurs, it will not be superfluous to inspect the smoke exhaust routes and make sure that they are in good condition.

Structural issues

The device of a chimney in a private house always assumes the presence of a straight chimney, located strictly vertically. Such a technique is considered to be the most effective, since if there are bends, inclined sections or horizontal pipes in the path of smoke, the draft will proportionally deteriorate, and slowly passing smoke will accumulate a large amount of soot on the inner surface of the ducts.

You should also pay attention to the location of the chimney against the outer wall. This is very rare, since it involves slow heating of the smoke paths and a large accumulation of condensate during cooling, which in hard frost freezes easily. In combination, these phenomena are conducive to the frequent occurrence of reverse thrust.

Least resistance to move the smoke into right direction occurs only if there is a structure round pipe. It is considered ideal for arranging the chimney of any heating appliance.

Correct installation

It is important to know that, depending on the type of heater being installed, the installation standards and connection rules will also change. Only with the right calculation can you get efficient work heating system without the occurrence of rarefied air.

This is largely affected by the combustion temperature of the fuel. The higher it is, the stronger the thrust, but at the same time, the need to obtain a volume of air sufficient for combustion will also increase proportionally. If ventilation does not provide it, then the stove or boiler will begin to take it out of the room, thereby provoking the occurrence of reverse thrust.

To avoid this phenomenon, when operating the stove, it is necessary to use a chimney tooth in its design. The device is a small ledge between the firebox itself and the smoke box. Reverse draft in the chimney of the gas column is eliminated by installing supply valve, but his work does not always help to really solve the problem.

Materials for arranging a chimney

In order to avoid problems with draft in the heater in the future, you should select in advance right material for the arrangement of his chimney. Absolutely for all gas boilers, columns and other devices, metal chimneys should be installed. Such material contributes to rapid heating, but also the same rapid cooling.

For home heating sources that use solid fuels for their work, the ideal chimney lining would be brick or ceramic. Such materials contribute to greater heating, but at the same time retain heat better.

When arranging smoke exhaust routes, it is important to pay attention to the smoothness of the surface. The smoother it is, the less likely the rapid accumulation of soot and the need to clean the chimneys.

Cleanliness check

In order to prevent back draft during the heating season, the chimneys should be regularly checked for cleanliness even before the need to regularly use the heaters. Blockages can be caused by birds flying into the chimney, large accumulations of soot, or peeling plaster from the inside of the chimney paths. You can check the cleanliness by looking into the pipe from the roof or through the cleaning hatch, but with the help of a mirror.

If there are contaminants in the pipe, they can be cleaned using special brushes and even chemicals sold everywhere today. In order to delay cleaning the chimney as far as possible, it is recommended to use one of the preventive tips passed down through the generations.

The first says that once every 10-12 furnaces, aluminum cans should be burned in the furnace. It is important that the combustion temperature is such that the cans are completely burned out in 5 minutes. It is also advised, if there is a large amount of soot in the chimney, to throw approximately half a bucket of peeled and chopped potatoes into the furnace while burning. The starch released during the combustion of the product will be able to soften the plaque, and the soot itself will crumble from the surface of the chimney. Can be periodically burned in the firebox rock salt This will also delay cleaning.

Chimney height

The presence of draft in it largely depends on the height of the pipe that removes smoke from the heater. The chimney should be approximately 5 meters high, but not lower than the ventilation duct. Its top point should be 0.5 meters above the roof ridge and approximately 1.5 meters away from it. In this case, the presence of trees or other buildings around the house that can impair traction should be taken into account.

natural process

In a private house, the presence of natural ventilation facilitates the flow of fresh air into the room. In apartments, especially after repairs and replacement of windows, the room often becomes airtight, and in the absence of air intake, a vacuum is created. In order for the situation to remain normal, during the repair, you should also think about installing additional ventilation valves. The usual kitchen hood or air conditioner.

Reverse thrust elimination

So, how to get rid of reverse draft in the chimney? In most cases, this problem can be solved independently. To eliminate a short-term lack of draft in the furnace firebox, you should burn a couple of newspapers to warm the air in the pipe, but most often the chimneys just need to be cleaned. If the draft disappeared after the repair or did not appear at all, then an error in the calculations was probably made, and additional devices would need to be installed in the room.

As such, smoke exhausters, chimney weathercocks and fans or deflectors can act. It may be necessary to increase the length of the pipe. You can also briefly open the window to ventilate and let fresh air into the room or insulate the chimney if its parts are located on the outer wall.

The lack of traction is dangerous not only for the functioning of the appliances, but also for the health of the residents themselves, therefore, in such situations, it is forbidden to use heating appliances until the troubleshooting.

The unpleasant smell of burning, smoke in the room, poor burning of firewood - all these are consequences reverse draft in the chimney. This is a problem faced by many owners of stoves, solid fuel boilers and other wood-fired heating appliances.

Why is there no draft in the chimney

Chimney clogged with soot

Perhaps this is the most common and main reason for the deterioration of traction.

When wood is burned, soot is formed. It is particles of combustion products that stick together and settle on the inner walls of the chimney, which leads to a narrowing of its diameter. As a result, the movement of air becomes difficult.

Therefore, the soot must be removed regularly. So you will not only improve traction, but also increase the efficiency and fire safety of the heater. To make the walls of the chimney less polluted with soot, you can use ones that contain less moisture and other harmful impurities.

Insufficient air supply

When burning firewood, it is necessary that the air moves “from bottom to top”. That is, from the room to the chimney and to the street. To do this, the room where the heater is installed must be provided with air flow - draft.

If all the windows are closed, if the ventilation is malfunctioning, then the smoke begins to move into reverse side- from the chimney to the room. That is, there is a backlash.

The easiest way to solve this problem is to create the right air movement in the room. For example, open a window before lighting a fire and close it 10-15 minutes after the flame flares up.

Cold outdoor air pressure

The draft in the chimney may deteriorate due to a decrease in outdoor temperature. Since cold air is heavier than warm air, it sinks down and "presses" inside the pipe. This problem is especially often manifested in the presence of the previous two - the lack of air flow and a clogged chimney. It enhances their influence.

Therefore, the solution is: insulating the chimney, removing soot and creating an air flow.

The presence of a visor on the chimney

Often a hood is installed on chimneys, which can prevent smoke from escaping from the chimney. As a result, an air "plug" of smoke is formed and traction deteriorates.

In such cases, the visor should be replaced with a higher one or removed.

Incorrect chimney design

Backdraft can occur as a result of improper chimney design: narrow diameter, too high a height, a large number of bends or narrowings.

To eliminate problems of this kind, you will have to rebuild the chimney, which will entail a significant investment of time, effort and money.

brick collapse

Due to the constant heating-cooling process brick chimney, it can collapse. Bricks will fall off, fall down and clog the chimney.

To avoid such a situation, the chimney must be insulated. This will also solve the cold air pressure problem.

conclusions

So, how to increase the draft in the chimney? Here are a few simple steps, not requiring special costs time and money:

Clean the chimney of soot. This is the first thing to do. You can do it on your own with minimal cost time, effort and money.
Ensure air flow. Open a window for 5-10 minutes before starting a fire. This will create the correct movement of air in the room "bottom-up". The window can be closed after the fire flares up.
Insulate the chimney if it is not insulated. This will reduce the influence of cold air and also extend the life of the chimney.

As a rule, these simple steps are enough to increase chimney draft. If the problem is related to design features chimney channel, then more serious resources will be required to solve it.

No draft in the chimney: 6 reasons for reverse draft and how to improve it yourself