Deflector on the flue gas boiler: Installation requirements

Regardless of the type of fuel, a mandatory part of the heating system is a chimney. From its competent device dependent, so the heat will be in the house.

A special kind of fuel gas, because it is not safe, so many people worried about the question of whether the deflector on the flue gas of the boiler is necessary and proper to be a solution to the problem? Let's try to deal with this complex issue in our material.

The content of the article:

  • Popular types of traction enhancers
  • What is the vent?
  • The design of the deflector
  • Features popular models
  • How to calculate the static deflector?
  • Assembly unit
  • Build a simple model of a plate
  • Features of the rotary deflector assembly
  • Deflectors weathervane Chimney
  • Conclusions and useful videos on the topic

Popular types of traction enhancers

In today's performance there are different types of vents, so you can choose a model for the home, made in any architectural style.

These devices differ structurally:

  • flat top;
  • two ramps;
  • semicircular cover;
  • folding pommel.

Each of these different specific advantages: on the baffle opening cover allows control over the process flue gases.

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As a decorative element for the roof, made in the Art Nouveau style, is perfect for flat top, the best protection against weathering - Gable mini roof. As a material for the manufacture of galvanized metal generally used, but sometimes it is covered with a layer of plastic or enamelled.

What is the vent?

Strong wind is able to disrupt the stable operation of the gas boiler. often works equipment and the boiler is switched off in these conditions. The products of combustion from the gas boiler with inefficient their disqualification provide a threat not only to health, but also the lives of people.

To increase the thrust by optimizing the use of air streams traction stabilizers or deflectors. The translation of its name sounds like a reflector, the deflection device. In his work applied Bernoulli effect based on pressure reduction during flow obstacles airflow. He rejects the air masses, increasing the force of the main stream of the chimney.

Deflector to the chimney

Flue gas boiler equipped with a deflector, will not fade in strong gusts of wind. The design becomes more efficient, since traction is increased to 20%

The amplifier operates efficiently traction at any wind speed and even during strong gusts, if any, will occur tilting traction. But when no wind is an aerodynamic device acts as an umbrella and is virtually idle, and sometimes reduces cravings. For this reason, many experts do not recommend to install deflectors on the gas flues.

Despite the increased requirements for the deflector mounted on gas boiler chimneyIn some cases it is the only solution to the problem. If this device is not incorporated into the project, it is necessary to coordinate the installation with gasman. Only this condition is met, you can proceed to the installation of the deflector.

On the specifics of the device and the related principle of action deflectors are divided into the following varieties:

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Traditional deflector in the form of an umbrella

Normal, structurally simple deflector is shaped like an umbrella. However, its functions include not only protection from atmospheric water, but also to gain traction. It is enhanced by the formation of turbulence on the device surface when hitting the wind him

H-shaped deflector apparatus

Created as letters H deflektornyeustroystva significantly enhance the thrust direction due to the flue gases to multiple channels. They are installed in areas with high wind loads

Deflector weathervane effect sails

In regions with low wind load the best solution would be a deflector weathervane. It was successively established visors swivel catch and effort slightest whiff

Model using spark arrestor

For flat and sloping roofs do not need a high chimney, but the installation of a small channel height may result in a fire roofing, especially if it is susceptible to burning. In these cases, suitable baffle with a spark arrester precluding ingress of sparks to ignite inclined surface, such as shingles or ondulin

Traditional deflector in the form of an umbrella

Traditional deflector in the form of an umbrella

H-shaped deflector apparatus

H-shaped deflector apparatus

Deflector weathervane effect sails

Deflector weathervane effect sails

Model using spark arrestor

Model using spark arrestor

The design of the deflector

The deflector prevents direct air flow into a chimney.

The standard consists of 3 parts:

  1. the upper cylinder (Diffuser), extended bottom. It is attached to the bottom of the use of special racks.
  2. the lower cup of metal, ceramic or asbestos cement.
  3. hood in the form of a cone-shaped umbrella.

The upper part and a lower annular cylinder equipped with rebound, deflection air flow. In some models, the upper element is absent. Then, the pipe is set lower cylinder, then comes the diffuser and caps - forward and reverse.

The device works on a simple principle:

  • cylinder wall, located above, assume the wind blow and direct airflow to bypass;
  • by sliding along the surface of the individual air jets and lifting upward, suction occurs gases coming from the chimney.

Link amplified in any direction of the wind than horizontal. In the latter case, the formation of air eddies inside the device for cutting off the output of smoke. This drawback is eliminated by adding an additional element - an inverted cone.

The design of the deflector

Structurally, the deflector is composed of the diffuser (2) with a frame (3) mounted on the tube (1). These elements are arranged in the shell (4). Above the diffuser is an umbrella (5) with thermal insulation (6) and the screen (7). Replaceable filter (10) mounted on supports (9) and is secured by bolts (11)

Reverse cone mounted below the cap. Task deflector - providing output to the outside air flows through their crushing.

Features popular models

deflectors models differ in both size and sensitivity to the wind. The most popular models such as the TsAGI Khanzhenkova, Wolpert-Grigorovich, "Smoke a tooth", "Hood" also known as "Fishnet", "Shenard". The first of these models - designed aerodynamic Institute. Zhukovsky.

Most TSAGI use in ventilation systems in view of the difficulties encountered in cleaning soot. The second model is essentially the same TsAGI, but somewhat improved by the inventor. In fact, this auxiliary cylinder around the tube with an umbrella-lid immersed inside the cylinder by a certain distance.

Deflector for the flue

Deflector TSAGI homeowners choose most often. It has a cylindrical shape. Device manufactured from galvanized steel or stainless

Deflector Wolpert-Grigorovich has proven itself as an amplifier rod on the chimney. It works effectively in areas with prevailing winds grassroots. The design includes two cylinders - the bottom with two outlet pipes and with the upper lid.

"Smoke a tooth" is mounted in a specially provided for in the chimney door. Due to the fact that the structure includes two handles air flow can be adjusted.

covers options

Dymnikov cover for doing the most different forms. Sometimes they are covered with heat-resistant enamel. Single copies look very decorative

Deflector "hood" has a rotatable structure. It consists of a semicircular trough collector air hoisted on a rotary shaft, mounted inside the tube. Increasing capacity by setting the thrust deflector, the wind vane is due to the turbulence that occurs when the wind load.

How to calculate the static deflector?

With self-manufacturing deflector is necessary to perform calculations and to outline a sketch of the future product. Necessary to proceed from the inner diameter of fume collection tube.

The structure of the deflector

The photo shows the vent size of the flue diameter. To determine the diameter of the lower cone base parameter is multiplied by 2 and the upper - 1.5, the height of the diffuser - also 1.5, the height of the cone, including reverse, of the height zonta- 0.25, entering into the diffuser tube - by 0,15

For the parameters can be gathered from the table of standard devices:

The inner diameter of tube (cm) Baffle height (cm) The diameter of the diffuser (cm)
12 14,4 24
14 16,8 28
20 24 40
40 48 80
50 60 100

The table allows to choose a deflector dimensions without performing calculations. But if suitable dimensions it does not have all the same or a calculator to find the appropriate program on the Internet.

In the manufacture of the deflector to the individual parameters used for determining the size and the specific formula:
• Ddiffuzora = 1.2 x Din. pipes;
• H = 1,6 x Din. pipes;
• The width of the cover = 1,7 x Din. pipe.

Learn all you can calculate the size of a scan cone umbrella. If a known diameter and height, the diameter of the circular blank, easily calculated using the Pythagorean theorem:

R = √ (D / 2) ² + H²

Now we have to define the parameters of the sector, which will then be cut from the workpiece.

The length of a full circle at 360⁰ L equals 2π R. The circumference underlying the finished cone Lm, will be less than L. From the difference of these lengths determined by the arc length of the segment (X). To make this proportion:

L / 360⁰ = Lm / X

As it is calculated the required resolution: X = 360 x Lm / L. The resulting value is subtracted from the X 360⁰ - it will cut out sector size.

Thus, if the height of the deflector must be 168 mm and the diameter 280 mm, the radius of the billet is 219 mm and its length in the circumferential Lm = 218.7 x 2 x 3.14 = 1373 mm. The desired cone will have a circumference of 280 x 3.14 = 879 mm. Hence 879/1373 x 360⁰ = 230⁰. Cut sector should have an angle of 360 - 230 = 130⁰.

When you need to cut the workpiece in the form of a truncated cone to solve a complex problem, because known value is the height of the truncated portion of the cone and is not full. Regardless of this calculation is performed on the basis of the same theorem of Pythagoras. Full height are out of proportion:

(D - Dm) / 2H = D / 2Hp

Which implies that Hp = D x H / (D-Dm). Learning this value, parameters are calculated for the full cone preform and subtracting therefrom the upper part.

Plans for the deflector

In known parameters: height of the cone - the complete or truncated and radius of the base, by simple calculations simply define the outer and inner radius (in the case of a truncated cone) and then the starting angle and the length of the generator crooked

Assume required truncated cone, in which H = 240 mm, diameter 400 mm at the base, and the upper circle should have a diameter of 300 mm.

  • Overall height Hp = 400 x 240 / (400 - 300) = 960 mm.
  • The outer radius of the workpiece Rz = √ (400/2) ² + 960² = 980.6 mm.
  • The radius of the smaller hole Rm = √ (960 - 240) ² + (300 | 2) ² = 239 mm.
  • Sector Angle: 360/2 x 400 / 980.6 = 73.4⁰.

It remains to draw a single arc radius of 980.6 mm, and the second - a radius of 239 mm from the same point and have radii at an angle 73.4⁰. If the planned dock edge overlap, the seam allowances are added.

A more about how to build your own chimney vent to read Further.

Assembly unit

First, patterns are harvested and then they are laid on the metal sheet and cut out items using special scissors. The housing collapse, fastened by rivets edge. Next fastened between an upper and lower cones, using the edge as the first it is more and It can be cut in several places special mounting notches width of about 1.5 cm, and then bend them.

Sophisticated design

Collect a simple deflector is easy to install but if the device is subject to rotary type will have to deal with many details

Before assembly, the lower cone mounted rack 3, evenly distributing them on the perimeter and using the threaded studs. For compounds of the umbrella with a diffuser on the last loop of rivets attach the metal strips. Racks are screwed into the loop and more reliably perform the fixation nuts.

Further, the assembling operation is performed manufactured own deflector for the flue gas or other type of boiler. The assembled device is placed on the tube and fixed using clamps without allowing gaps. Sometimes the joint is treated with a heat-resistant sealant.

Build a simple model of a plate

The simplest of the project is the production of a plate deflector model. Such a cap for the chimney can be easily done by hand. Its geometric parameters depend on the diameter of the tube:

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The design of deflector for a circular tube

Structural components of the simplest models is metallic umbrella clamp for fixing on the tube, and remote racks

The diameter of the clamp for fixing the deflector

The diameter of the collar, with which the device will be fixed to the chimney must be equal to the diameter of the pipe

The size of the cap to the chimney

The diameter of the cap to the base of the chimney should be 5 - 7 cm more than the same size of chimney

The distance between the clamp and the fastening umbrella

Remote metal racks must form a distance equal to the diameter of the metal cap or 2/3 of the size of

The design of deflector for a circular tube

The design of deflector for a circular tube

The diameter of the clamp for fixing the deflector

The diameter of the clamp for fixing the deflector

The size of the cap to the chimney

The size of the cap to the chimney

The distance between the clamp and the fastening umbrella

The distance between the clamp and the fastening umbrella

In order to avoid mistakes in the manufacture and accurately adjust the items under the desired size, it is desirable to prefabricate the deflector model of cardboard. At this stage, simpler and easier to make adjustments to the design. The carton blanks at the same time serve as a kind of pattern in cutting future deflector elements:

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Production deflector pattern on the chimney

In order to avoid defects in the course of cutting, it is necessary to make the pattern of cardboard. Checking and correcting the shape, if necessary, it is necessary to transfer the outline of the steel sheet parts

Assembling metal hood to the chimney

The cut part of the umbrella to the gas pipe to bend along the cut-off, and put it one side to another to connect the studs on the inside

Apparatus remote racks

Each of the supports of the metal cap is attached to the edge of the umbrella pair of staves

Fixing the locking collar of the deflector

The second edge of each leg clamp to connect, store-bought ready-made or made with their own hands

Production deflector pattern on the chimney

Production deflector pattern on the chimney

Assembling metal hood to the chimney

Assembling metal hood to the chimney

Apparatus remote racks

Apparatus remote racks

Fixing the locking collar of the deflector

Fixing the locking collar of the deflector

Features of the rotary deflector assembly

Turbodeflektor, a rotary deflector, Rotary turbine, Turbovent - all these names refer to the same type of mechanical device to gain traction. It consists of a static part connected to the chimney and the active heads with blades in the form of a ball.

A rotary deflector - the only device that does not advise mounted on chimneys stoves fired with solid fuel and wood stoves. Turbovent has a characteristic feature - take the air out of the pipe, even during the period when the heating was not working.

this nozzle rotation direction does not depend on strength or direction of the wind. It happens only in a constant direction, creating a partial vacuum effect. As a result, the power increases in the thrust air dilution conditions, and the risk of tipping thrust is practically equal to 0.

On the chimneys of gas boilers Turbowent copes with its functions, and can be a decoration for any facade. If we compare it with other types of vents, the performance it exceeds 2 times.

The grounds at the rotary deflector may be round, square, flat square. The dimensions of the head varies between 100 - 680 mm. Its service life - up to 15 years.

With all the advantages of a rotating turbine there is one, but significant drawback - to calm the device stops. If at this time will be observed rainfall at a temperature below 0, the head can be frozen and will have to take measures for its launch.

Despite the relative complexity of the design, set the rotary deflector is easy. The device has a low weight, so much effort for mounting one person and time of about 2 hours. Suitable place - the highest point of the roof. This arrangement does not allow the snow to get to the pipe, if it happens around the accumulation of sediments.

The rotary deflector

Rotational movement of the head of the turbine is carried by bearings. The apparatus operates autonomously and very efficiently copes with the problem of discharge of gases, but in calm weather it is useless

For different models of rotary turbine there is one requirement: combustion temperature above the pipe must not exceed 150-250⁰. Base dimensions necessary to accurately fit a chimney. Turbocharged deflector should match the characteristics of the boiler, and this point must be considered when selecting the devices.

On the market there are turbodeflektory from different brands. Among the most authoritative - Turbowent, Turbomaks, Rotowent. The first manufacturer produces products with a base of different geometry.

Can determine their labeling TA 315, TA 355, TA-500. It figure denotes the diameter in case of circular cross-section or rectangular base dimensions.

Deflector Turbomaks Belarusian company produces. Device manufactured from high quality material - the stainless steel of European suppliers. Rotowent also made of stainless steel imported from Poland. Harmoniously looked on the roof of any type. Suitable for chimney and for the ventilation pipes. Withstand greater operating temperature - about 500⁰.

Deflectors weathervane Chimney

Structurally Chimney vane is arranged so that the gases exiting freely downwind, increased traction in the chimney. Achieved device from heat-resistant steel proven at high temperatures and condensation.

Under curved visor vane is a bearing assembly for fear of problems with rotation. To a chimney bearing assembly bolted. dilution zone is created during passage of air flow through the space under the peaks.

deflector vane

When mounting base device is put on the round chimney until it stops, and then secured with bolts 3. Tighten the bolts with greater care because It can damage the pipe. Installation complete check of verticality and rotation of the body

Less chimney weathervanes that when the wind of great strength, they become unstable. The movable part must be periodically cleaned, lubricated. Inside the device often accumulate moisture and the flue gases leave a mark in the form of deposits.

Manufacturers themselves are advised to use their device in the case of the chimneys in the wrong place. It is, in fact, does not enhance traction, but only protects the chimney.

Conclusions and useful videos on the topic

Whether it is necessary to install power thrust in the presence of a gas boiler, will learn by watching this video:

Turbodeflektor do with their hands is not easy, but some craftsmen still do so successfully exploited. Watch this video:

Designs baffles a lot, but we must not forget that the gas is used for heating. Not all models can be used. Some of them are not suitable in principle as intended ventilation. Not to block the smoke removal system, it is necessary to consult a specialist and obtain a permit for the installation of the deflector.

You look for the deflector to the chimney? Or have experience in the manufacture or installation of this device? Please share it with our visitors. Also, in the block with comments, you can ask questions on the topic of the article.

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