Chimney deflector. Chimney cap - a modern architectural element Do I need a chimney deflector

Arrangement of the upper part of the chimneys and ventilation ducts should protect the duct from debris and prevent draft suppression due to the strong influence of the wind. The simplest option is a cone-shaped hood that closes the chimney mouth. However, this does not always save one from the negative influence of the wind. To solve this problem, a deflector is installed on the chimney.

What is it needed for

The main thing when calculating the parameters of the chimney is to create sufficient draft that can remove the combustion products from the combustion chamber of a solid fuel furnace due to a significant pressure drop. For this, the required channel diameter, material, sectional shape and pipe height are selected.

A strong wind is able to blow air into the mouth of the channel, thereby preventing the exit of exhaust gases. An extreme case is the effect of traction suppression, when the boiler exhaust is not able to overcome the resistance and flows back into the room, which, in principle, is not acceptable.

It is not enough to close the chimney mouth from external air flows, but there are no optimal designs for this. It is better to use the force of the wind itself in order to avoid negative consequences and even further increase the thrust, which the deflector does just fine.

Principle of operation and device

The work is based on Bernoulli's law, which is true for liquids and gases. When gases move in a channel with a decreasing cross-section, their velocity increases, and the pressure exerted on the channel boundaries decreases, and a vacuum occurs. If there is a connection between the surrounding space and the vacuum zone, then the fast flow carries away the substance from the outside.

A deflector is a device that allows air to flow around or pass through a narrowing channel, in which a rarefaction zone appears directly near the mouth of the chimney. The gases coming out of the chimney begin to be sucked into the area of the discharged gas. As a result, the wind, which could cause suppression of thrust, on the contrary, begins to increase it.

It is possible to achieve a 20% increase in thrust even with the simplest deflector design. For stoves and boilers for solid fuels, this means better combustion of coal, wood or briquettes, better heat transfer and, as a result, increased efficiency of the installation. Problems associated with flame attenuation or return of exhaust gases inside the room are eliminated.

The device additionally prevents debris, snow and rain from entering the channel. This is partly due to the presence of the deflector housing, partly because the supported thrust counteracts clogging.

Views

The design is not regulated in any way. Any design that does not cause additional resistance and creates a vacuum in the chimney mouth increases draft justifies its operation. There are several types of deflectors that have become widespread due to their practicality and reliability:

Deflector TsAGI
Disc deflector, Astato
Round "Volper"
Deflector Grigorovich
H-shaped deflector

Each of the listed types does an excellent job with the assigned tasks. The differences are overall dimensions and wind susceptibility of different directions. The disadvantage of almost all types is that in the absence of wind, they themselves resist traction.

Several other devices operate in a similar way: a turboprop head (rotating deflector) and a weather vane with a screen.

The deflector is made of galvanized steel, copper and stainless steel. The main requirement is high resistance to corrosion, because the device will be installed on a chimney, where it will be extremely difficult to carry out repair work, especially when a heating boiler or stove is operating.

For ventilation ducts, where high temperatures are excluded, polymer materials can be used, or polymer coatings for metal structures.

Deflector TsAGI

The most common type of deflector. On top of the chimney mouth, a short channel with a larger diameter is fixed, which will form a diffuser. The wind flows around it from all sides. On the sides there are zones of increased pressure. At the front point and at the rear in the lower and upper sections, a vacuum arises, which contributes to an increase in traction.

Turbulence occurs along the upper edge of the diffuser, which can obstruct the escape of gases. In addition, there is no protection of the chimney mouth from the ingress of debris and atmospheric precipitation. As a solution, a cone-shaped protective cap is fixed above the mouth.

Poppet

A deflector that is easy to design and provides the desired effect in the most visual way. The two main parts of the device are a visor for the chimney, the lower part of which is closed with a cone facing the chimney and a ring from which a truncated cone is formed and put on directly on the very edge of the chimney.

The result is a simple and efficient design. Regardless of which side of the world the wind is blowing from, it hits a point above the mouth, where the cones form a tapering channel, which causes the vacuum and pumping of gases from the chimney.

Round "Volper"

In principle, the design is identical to the TsAGI deflector, only the cover for protection from debris and atmospheric precipitation is located above the diffuser. The lid is in the form of a cone, which additionally creates a vacuum in the upper part.

Deflector Grigorovich

It is a further development of TsAGI and is better suited for installation in places where ascending air currents prevail. In addition, it provides optimal performance even in the absence of wind, without creating perceptible resistance. In the lower part, the deflector is a high truncated cone with an expansion in the lower part. It starts at the chimney mouth with an overlap up to a third of its height.

The gases from the pipe itself enter the narrowing channel of the diffuser, and thereby cause a vacuum. The upward currents of the outside air further enhance the effect by increasing traction.

H-shaped

A non-trivial design that has proven itself well in industrial facilities and powerful boilers. At the mouth of the chimney, a transverse branch pipe of identical diameter is fixed. For mating, there is a cut-out in the center of the branch pipe, which ensures a tight connection.

Along the edges of the horizontal transverse pipe, two more segments are fixed, resulting in a structure in the shape of the letter "H". It is no longer necessary to use protective caps, because the chimney mouth is reliably closed with a horizontal element, and the side pipes are through and do not interfere with the passage of precipitation.

This design, in any wind direction, provides a uniform air flow directly near the mouth or along the side channels, which already creates additional thrust.

Installation

The installation of a deflector is supposed to be installed on the chimneys of furnaces and boilers operating on solid fuel, in some case also on liquid fuel. However, it cannot be installed on gas boilers. This is due to the inconstancy of the created thrust, because it directly depends on the strength of the wind. If the draft is too high, the fire at the outlet of the injectors in the combustion chamber can go out. All this is indicated in the regulatory documents SNiP 2.04.05-91, SP 7.13130.2009.

For efficient operation, the deflector should only be installed if the chimney mouth is located above the structural elements of the roof. For pitched roofs, a lower position is allowed. So at a distance of 1.5-3 meters from the ridge, it is possible to install it on a level with it. When located further than three meters, the angle between the plane of the ridge and the conditional straight line between the ridge and the mouth of the chimney should not exceed 10 degrees. For flat roofs, it is enough to go beyond the main enclosing structures.

You can make a deflector yourself. The easiest way to make a version of TsAGI or "Volper". The calculation of the size of each of the elements is carried out, starting from the inner diameter of the chimney. If we denote it as d, then it turns out:

diffuser diameter - 1.2-1.3d;
deflector height 1.6-1.7d;
the width of the protective cap - 1.7-1.9d;

The height of the diffuser is taken to be equal to half the height of the entire deflector. In its lower part, a clamp is equipped, which will be mounted at the mouth of the chimney. A diffuser is fixed to it with 4-6 strips of galvanized steel. A protective cap is attached to the latter using the same strips. The gap between the diffuser and the bell is 0.2-0.3d.

To increase efficiency, you can build a nozzle with an external opening at the chimney mouth, or better on the deflector mounting ring. The height of the nozzle can be equal to 0.1-0.2d, the outer diameter should increase approximately the same (1.1-1.2d)

This is the easiest construction to prepare. All elements are easily cut from sheet steel with a small amount of trimmings.

In order not to be mistaken with the markup, it is better to first cut out the shape of the blanks from cardboard, and then transfer them along the contour to a sheet of metal.

All elements of the deflector are connected by folding, riveting or welding. After that, the finished structure can be fixed at the chimney mouth and checked in operation. To be sure of the reliable and efficient operation of the deflector, it is better to purchase a ready-made structure with ideally calculated parameters and dimensions.

The deflector is a cap on the chimney pipe, which is mounted on the head of the smoke exhaust device and protects the smoke channel from strong gusts of wind and atmospheric precipitation. Due to their protective function, chimney caps are often called umbrellas.

Modern chimney hoods are real works of art that adorn the building, giving it a unique style and design. On sale you can find caps for pipes of various configurations, and the simplest device is easy to make yourself.

Varieties of deflectors for chimneys

Chimney hoods are available in various designs and shapes. The most common varieties include:

A pipe cap with a flat top cover;
Chimney cap with opening lid;
A pipe cap with a semicircular top cover;
Chimney hood with gable roof.

The type of structure should be selected taking into account the architectural style of the building. So, the flat covers of this device are in best harmony with the buildings in the Art Nouveau style, and the semicircular ones - with modern buildings. The opening lid allows for enhanced control of the smoke evacuation process. The gable roof has proven itself well in areas with significant precipitation in the winter season and contributes to the rapid removal of snow.

If we talk about the material of manufacture, caps for stove pipes are made mainly of galvanized iron, although recently caps for pipes that are covered with enamel or plastic on top have become widespread.

The following designs of this device are also distinguished:

TsAGI;
"Smoke Tooth";
Open Astato;
H-shaped;
Grigorovich;
Double;
"Shenard" in the form of a star;
Volpert;
Spherical with rotation.

What elements does the deflector consist of?

The chimney hood has a simple design that can be easily recreated if necessary. Key elements that make up the chimney hood:

The upper glass, which is also called the diffuser;
Bottom glass;
Lid;
Brackets.

The principle of operation of the smoke channel deflector

The chimney cap increases the draft in the chimney by 20%. In more detail, the principle of operation of the deflector looks like this:

When exposed to wind, air currents hit the outer surface of the deflector.
The air bends around the obstacle created by the hood for the chimney and thereby creates a vacuum.
Depressurization of the air increases the draft in the flue duct.

The phenomenon of air discharge as a result of the impact of an obstacle is called Bernoulli's law of aerodynamics.

The main disadvantage of the device for increasing thrust is considered to be the vortices that are formed inside the device when the downwind blows. They prevent smoke from escaping. However, this drawback can be easily eliminated by installing a reverse cone under the umbrella, which does a good job of dividing the air streams.

Where is the deflector on the pipe used?

Pipe caps are used for heating appliances and devices.

The main application is their use for such structures:

Devices for natural ventilation;
Chimneys of private houses;
Emission channels for products of processing fuel of a solid fuel boiler, column, heat generator;
Garbage chute stands.

How to make a device with your own hands

If necessary, you can make a deflector for the chimney with your own hands. To do this, you will need to prepare materials in advance:

Galvanized iron;
Stainless steel;
Copper.

In order to make a chimney cap with your own hands, you will need to perform the following simple steps:

Draw on cardboard a detailed diagram of the main elements that make up the chimney cap: upper and lower glass, lid.
Transfer the pattern to the metal.
Cut out the chimney cap from sheet metal with special scissors.
Connect the elements with bolts, rivets and welding.
Cut thin strips from sheet metal. They will be used as brackets.
Fasten the chimney hood with the brackets on the outside.
Attach the cover on top.

Installing the device: installation steps

The boiler's performance depends on the correct installation and operation of the deflector. In order to carry out the installation, you must perform the following steps:

Place the lower bowl on the pipe.
Secure the lower glass with bolts.
Rivet and / or weld all parts together.
Fasten the umbrella-cap and the reverse cone to the brackets.

Installation of the Smoke Tooth model also involves:

Placing the device with a door in the direction of the smoke collector.
For ease of installation, it is recommended to temporarily remove the lining plates from the rear and side walls.
Two knobs on the structure are designed to adjust the operation of the oven.

Deflector with windbreak

In addition to the standard device, there is also a chimney hood with a windproof vane. Pipe caps with a wind protection mechanism consist of the following elements:

A - chimney;
B - vertical axis;
B - weather vane;
G - deflector roof;
D - semi-cylindrical screen;
E - lower bearing;
F - upper bearing.

The chimney hood with wind protection mechanism rotates depending on the gust of wind. The principle of its operation is as follows:

Turning the weather vane towards "downwind" and simultaneously turning the screen, which obscures the smoke channel. At this moment, the smoke goes out unhindered.
Due to the semi-cylindrical shape of the roof, wind flows slide along it and thereby increase traction.
The deflector bearing must be lubricated regularly so that it can rotate freely in the wind. In winter, the axle must be protected from icing.

Significant icing of the deflector when installed on the outlet pipe of a gas boiler has caused a ban on the use of the device for gas appliances.

The chimney system is one of the key elements of any heating installation, which is not inferior in importance to other structural elements. In order for the heating equipment to work correctly, the system must be provided with a stable air flow and the removal of fuel combustion products. Usually, a chimney is used for these purposes, which, with proper design and installation, will allow the system to fully operate on natural draft, removing all residues into the atmosphere.

In some cases, the arrangement of a full-fledged chimney is impossible, but the need for traction because of this does not disappear anywhere. In order for the system to continue to function, a deflector must be installed on the gas pipe, which will provide normal traction and allow the heating equipment to work. This article will focus on deflectors and their features.

Reasons for smoking chimneys

Often, when using a chimney, there is a phenomenon such as pipe smoke, which can occur for the following reasons:

Strong air gusts directed into the chimney. The result is a serious obstruction preventing smoke from escaping into the atmosphere. The draft is reduced, and the smoke remains in the system, sooner or later starting to enter the building.
The weak operation of the chimney can be explained very simply - if the design was originally calculated incorrectly, then there can be no question of normal functioning. For example, installing a chimney that is too narrow will necessarily lead to poor draft and insufficient removal of combustion products. The same can be said for lack of height or improper pipe placement on the roof.

If you can get rid of the second reason at the design stage, if the chimney has not yet been installed, then you will definitely have to face the first reason, so the need to install a chimney still remains.

The use of deflectors

The main quality of the deflectors for which they are used is the ability to increase traction by diverting external air flows. Regardless of the design, any deflector works according to the only principle - the air bypassing the obstacle creates a zone with low pressure, due to which the draft in the chimney increases. A good deflector can increase the efficiency of the flue system by 20%.

In addition, the deflector has an additional function that arises indirectly - an obstacle installed on the chimney pipe prevents precipitation and various debris from entering it.

The design of a simple deflector consists of two cylinders, one of which is at the bottom and the other at the top, and a protective cone, also called an umbrella. The bottom cylinder is usually part of a chimney made of metal or asbestos cement. For the manufacture of the deflectors themselves, galvanized metal is used.

There are several standard deflector options:

Deflector TsAGI;
"Volper" with a round body;
Deflector Grigorovich;
Opened Astato deflector;
H-shaped;
Star-shaped "Shenard".

Different types of deflectors are used in the following types of structures:

Collective and private ventilation shafts;
Collective and private chimneys;
Systems for removing gases and products of their combustion;
Garbage chute trunks.

Do-it-yourself installation of a deflector on a chimney

To assemble structural elements, you can use not only rivets, but also contact welding - there will be no noticeable difference in the end. When working, it is important to choose the right size ratio of the deflector parts so that it can then be installed on the chimney.

The principle of operation of the deflector assembled in this way is as follows:

Any stream of air trying to pass through the upper cylinder encounters an obstacle and bypasses it;
The air currents passing over the cylinder roll up and pull the smoke coming out of the chimney;
Due to the vacuum in the pipe, the movement is enhanced, so the thrust becomes an order of magnitude higher.

Even in the case when the wind flows are directed not strictly horizontally, but along a different trajectory, the cone installed on the chimney pipe still performs its functions. It turns out that the wind is in the upper cylinder, passing through the gaps of the structure, as a result of which the smoke is sucked out.

Installing a deflector with a windscreen

A deflector with wind protection is mounted as follows:

In the chimney, two bearings and a vertical axis are fixed on two levels;
A semi-cylindrical screen, a weather vane canvas and a roof of the structure are sequentially installed on the axis.

The principle of operation of systems of this type is as follows:

When the wind direction changes, the weather vane turns and pulls the curtain behind it, covering the chimney from the wind. As a result, smoke can escape from the leeward side of the chimney at any time.
The air currents pass tangentially above the semi-cylindrical screen and draw smoke along with them, increasing the thrust in the system.

To increase the efficiency of the structure, it is necessary to periodically lubricate the bearings of the deflector, and in the cold season it is also necessary to remove the icing that occurs in the structure due to condensation. Taking into account the last nuance, we can say that such a nozzle on the chimney pipe from the wind can effectively protect only those structures that are located in warm regions.

Features of deflectors

When installing a deflector on a pipe, you need to know about some of the features of its use:

To fix a round deflector on a square or rectangular chimney, you need to use special transition pipes.
If the installed chimney has a large cross-section, then the deflector must be installed on special legs or use steel supports.
When installing the transition from a square chimney to a round deflector, it is necessary to take into account the gradual overlap of the brickwork.
The installation of deflectors is required only for heating equipment operating on solid fuels - in other cases, any protective cone on the pipe will be useless.

Knowledge of these nuances will allow you to choose the optimal pipe deflector for the chimney and install it so that it can increase the efficiency of the entire heating system.

Conclusion

Installing a deflector on a pipe of solid fuel heating equipment makes it possible to increase traction in the system and simplify the removal of combustion products into the atmosphere - and this not only improves the quality of the system, but also prevents smoke from entering the living space, where it can harm human health.

All chimneys, regardless of the material of manufacture and configuration of the chimney structure, are equipped with special devices to protect the chimney from environmental influences, called deflectors. Read the instructions on how to clean the chimney from soot.

What is it and what is it for?

The chimney deflector is structurally a metal product, usually of a cylindrical shape, resembling a kind of hood. The deflector performs several basic practical functions, in addition to a decorative function (used to decorate the chimney). The deflector protects the chimney from turbulence, thereby creating optimal conditions for a high level of draft under significant wind loads. In addition, the deflector is equipped with an additional insert (plate) that prevents precipitation and foreign objects from entering the chimney.

Technical specifications

Deflectors can have a very different top shape:

deflectors can be flat;
deflectors can be tapered;
deflectors can have a gable roof, etc.

Deflector types

A chimney deflector used to increase draft consists of a cylinder, a diffuser, an umbrella. The design of the deflector is designed in such a way that in any direction of the wind, it can be diverted to the side, while ensuring effective removal of fuel combustion products.

Weather vane - a deflector for the chimney has an original design that allows the deflector to rotate when exposed to wind currents.

Turbine deflectors for chimneys, unlike weather vane - deflectors rotate only in one specific direction, converting and using wind energy to increase traction in the chimney.

When installing a deflector on a brick chimney, additional installation of a special transition with an overlap in the desired direction will be required, allowing you to connect a square or rectangular chimney with a circular deflector.

For chimneys of gas boilers, the best option would be to install a rotary (turbine) deflector.

The H-shaped chimney deflector is effective when gusty winds are characteristic of the area.

Additionally, the chimney deflector can be equipped with a spark arrestor, which is a metal mesh located under the deflector cover.

When installing an umbrella - deflector on the chimney, make sure that it is equipped with a drip pipe that leads the formed condensate outside the chimney.

Photo

There are practically no restrictions for installing a deflector on a chimney. The deflector can be installed both on individual chimneys and on chimneys of collective chimney systems.

In a situation where there is a risk of ignition of the roofing material from a spark from the chimney, it is recommended to install deflectors equipped with spark arresters.

Device and calculation

The deflector device has its own design features, which should be adhered to when calculating the parameters of the product, otherwise the deflector will not perform its functions based on aerodynamic laws.

When calculating the dimensions of the product, it must be borne in mind that the height should be 1.6 - 1.7 part of the inner diameter of the chimney, the width of the hood should be - 1.9 part, the width of the diffuser - 1.2-1.3 part.

How to make?

The deflector manufacturing process can be roughly divided into several stages:

preparation of the pattern (a scan of the main elements of the deflector is applied to the cardboard according to the calculations);
the patterns are transferred to sheet metal;
details are cut out;
the cut parts are connected to each other, either by welding or by means of fasteners;
additionally, it is necessary to make steel brackets, they will be needed to fix the cap on the surface of the chimney;
the cap is assembled from the parts (it is recommended that the cap be made in the form of an inverse cone).

Chimney deflector cost

Deflector prices vary, depending on the diameter of the product, from 400 rubles / piece. up to RUB 1,500 / piece

Video

Look at the video for a description of the deflector - spark dye in the video:

During the research work, it was found that equipping the chimney with a deflector increases the efficiency of the chimney system by twenty percent.

Installing a deflector on the surface of the chimney increases its draft, and also decorates and improves the presentable appearance of the entire building. There are different types of deflectors, which differ in the technological moments of their installation. We will talk about the features of chimney deflectors and the rules for their installation further.

Features and characteristics of the chimney draft deflector

A deflector is a device with an aerodynamic effect, which is mounted on top of a ventilation duct, in this case, a chimney. Its main function is to improve traction in the channels. This is achieved using a physically proven law, which states that the static thrust in a given section directly depends on the speed of movement of air flows that move in a modified transverse channel.

With the help of a deflector, draft is improved and the efficiency of ventilation and chimney systems is increased.

The operation of the deflector installed on the chimney is based on the fact that the wind, hitting an obstacle, before moving to the chimney, is in an area where there is low pressure, which improves its draft.

With the help of scientific research, it has been proven that the installation of a deflector on a chimney improves its efficiency by at least 15%. In addition, the deflector prevents contamination of the inside of the chimney with snow, moisture, debris, etc.

The deflector does not depend on the weather in the environment or on the wind. It is capable of improving traction in all conditions.

The deflector on the chimney allows air currents to hit it from the outside, then they flow around the surface of the entire device, the air, in this case, becomes rarefied. It is thanks to this that traction is significantly improved.

The principle of operation and the device of the chimney deflector

Chimney systems are present in almost every home, as they are one of the most important parts that make up any thermal installation.

To ensure the efficient operation of thermal structures, care should be taken to properly organize the supply of fresh air and exhaust smoke.

With the naturally aspirated operation of heat generators, it is the chimney that bears responsibility for the stability of the output of combustion products. In order to reduce the wind effect on the chimney, deflectors are used.

Installation of this device is appropriate in the event that the smoke is not properly removed from the room. For the appearance of this unpleasant phenomenon, there are several factors:

the presence of a gusty reinforced wind that enters the pipe and reduces the thrust, in addition, it prevents the combustion products from being completely removed;
incorrect location of the chimney or its too low height;
incorrectly selected chimney pipe diameter.

Wind protection device - a deflector, helps to remove gases from the smoke channels, using the wind. The deflector independently changes the wind flow in the direction necessary for it. Thus, with the help of the wind, it turns out not to reduce, but to increase traction.

Installation of the deflector is possible on the channel for both individual and collective use. In addition, the scope of their use extends to:

ventilation systems;
gas installations;
garbage chute trunks.

The design of the deflector for the chimney pipe consists of:

the lower section of a cylindrical shape, for the manufacture of which pipes made of metal, asbestos or ceramics are used;
diffuser - the upper cylinder is larger in diameter than the lower one, three or four racks are used to fix it;
umbrella shaped like a cone.

On the upper section of the lower part of the cylinder and the diffuser, there are annular rebounds, with the help of which the wind is deflected. The design of the deflector is to ensure uninterrupted exit of combustion products from the chimney and improve draft.

For the manufacture of the diffuser and the deflector umbrella, galvanized steel is used.

The principle of operation of the deflector is as follows:

with the upper impact of the wind on the surface, gases are sucked in by the lower annular section;
if the wind begins to act from the bottom, then the gases are removed from the upper hole;
if the effect of the wind has a horizontal direction, then the thrust improves immediately through two rings.

The most ineffective deflector operation is observed when there is an overhead wind effect on the chimney. At the same time, the wind is reflected using an umbrella. All types of deflectors have this disadvantage. To eliminate it, in the process of making an umbrella, it should be made in the form of not one, but two conical parts, the connection of which occurs with the part where the base is located. Thus, with the help of the lower cone, air and smoke flows are reflected.

Chimney deflector - varieties

In relation to the design features and shape, the deflectors are divided into:

devices with a flat top;
deflectors in which the lid opens;
with the presence of two slopes on the surface of the pipe, that is, with a gable-type cover;
with the presence of a semicircular top.

In the exterior of a house built in a modern style, a variant of the deflector is used, which has a flat top, which is made from a copper composition.

In addition, the version of the cap with a semicircular top is quite popular.

The deflector, which has a gabled cap, provides reliable protection of the chimney from dust or atmospheric precipitation.

In the process of manufacturing the deflector, galvanized steel is used. Although there are purchased options for deflectors, in which the metal is covered with plastic or enamel.

There are a huge number of structural deflectors:

1. The use of the Tsagi deflector allows you to increase the draft in the ventilation and smoke channel. This deflector is distinguished by the presence of a cylinder; they are of round and rectangular cross-section. In order for the deflector to function smoothly, it is installed at a distance of 100-159 cm above the roof.

The main components of this type of deflector are the presence of:

inlet pipe;
diffuser;
brackets;
body part;
umbrella.

2. The deflector, called "Smoke tooth" is distinguished by individual installation features, which imply its installation by means of a door to the smoke collector. One end of it is wound behind the wall, and the other is lifted and installed on the chimney. To facilitate installation, care should be taken to remove the fuser plates located on the back and side walls. In addition, on this deflector there are two handles, which are called "cold hand", it is with their help that the operation of the stove is adjusted and controlled.

3. Particularly popular is the use of the Grigorovich deflector, which does an excellent job of improving draft both on chimneys and on ventilation openings. This deflector has a simple design, so it is quite possible to do it yourself. This deflector includes a lower cylinder, which includes two nozzles, an upper cylinder, a tapered part and fasteners - two brackets.

For the manufacture of this type of deflector, it is better to use tin, galvanized steel or special steel intended for the construction of boilers. In the absence of an opportunity to purchase these materials, they are replaced with cheaper alternatives, only the service life of the deflector, in this case, is significantly reduced.

In addition to these options, chimney deflectors are spherical, star-shaped, open, round. Deflectors are divided into devices according to their purpose:

for standard chimneys;
deflector for a gas chimney;
for ventilation systems;
for garbage chutes.

Diy chimney deflector: manufacturing features

Each of their deflectors has individual dimensions that must meet certain parameters. For example, when calculating the height of the deflector, one should take into account the fact that it should be 1.6 parts in relation to the internal size of the chimney, and the calculation of the width is 1.8 parts.

In addition, 1.2 is the deflector width. To build a deflector with your own hands, you will need material in the form:

galvanized steel;
copper;
of stainless steel.

Although the purchase of these materials is expensive, it is best to give preference to them, since the deflector is most susceptible to external irritants in the form of wind, ultraviolet radiation and precipitation. The best option is to use copper. We suggest that you familiarize yourself with the instructions for making a deflector with your own hands:

1. Before proceeding with the construction of the deflector, you should take care of taking measurements from the chimney and creating a drawing of the chimney deflector.

2. First, a scan of all the parts that make up the deflector are drawn on cardboard paper.

3. They are transferred to the metal surface, and using special scissors are cut according to the specified workpiece.

4. Rivets, bolts or welding will help to connect the necessary parts together.

5. Brackets are formed from steel strips, which are used to fix the cap.

6. The conical part of the deflector is installed on the hood.

First, the deflector itself is assembled, which is then mounted on the chimney. This is followed by the installation of the lower cylinder, which is fixed with bolts. Then a diffuser is fixed on it; clamps are used for this purpose. A dome with a reverse cone is installed on the surface of the diffuser.

Design features of the weather vane deflector

There is a variant of manufacturing a weather vane-deflector, which is distinguished by the presence of a rotating body part. It includes deflector visors, a bearing assembly and a weather vane itself, which is responsible for the rotation of the deflector.

The principle of operation of this device consists in the passage of air flows through the inter-visor space, thus, the air is liquefied and accelerated. This has a positive effect on increasing the draft in the chimney, on the rate of fuel combustion and on improving air exchange, in the presence of additional ventilation.

By means of these deflectors it is possible to prevent back draft, spark formation and flame blowout.

For self-fabrication of the structure, you will need to fix the deflector at the chimney cut using rings with a bearing assembly.

Although they distinguish between deflectors of the weather vane of various design, they are distinguished by rapid deterioration, due to the fact that the elements responsible for rotation fail. They are adversely affected by corrosion and pollution. In addition, in autumn and spring, the metal parts of the weather vane are exposed to condensed masses, which, when freezing in winter, stop the operation of the vane. Therefore, their use in regions with severe winters is impractical.

Diy deflector manufacturing technology

two cylinders located at the bottom and top of the device;
branch pipe;
conical part;
two brackets.

Before the construction of the deflector, it is necessary to determine the size of the deflectors for which it is necessary to measure the diameter of the chimney pipe, the place of attachment and the height of the structure.

To work, you will need:

metal sheet;
scissors for metal;
fasteners such as bolts, nuts, rivets;
scribes;
dense cardboard base;
ordinary scissors.

In order not to spoil the expensive steel, a cardboard model of the deflector is pre-cut, which is adjusted to the dimensions of the chimney. Further, already according to a previously prepared layout, all metal parts are cut out. For this, cardboard blanks are applied to steel and outlined with a scribe.

Metal scissors will help you cut the elements. All parts are connected with metal rivets, bolts and nuts. For the manufacture of brackets, steel strips are used.

After preparing all the necessary parts, the deflector is assembled:

a lower cylindrical element is mounted on the chimney pipe, for fixing which bolts are used;
a diffuser is fixed on it;
brackets help fix the surface of the reverse cone and cap.

Tip: If there is a too large diameter of the chimney, a metal wire is used to reduce it, which is wound around the deflector.

Among the advantages of manufacturing this design of the deflector include:

good protection of the chimney from the ingress of debris and atmospheric influences;
duration of operation;
increasing the efficiency of the chimney.

Among the disadvantages of this deflector are:

imperfect design;
the emergence of difficulties in carrying out measurements and manufacturing.