Ventilation deflector: device, varieties, installation rules

Right choice

When choosing a deflector, it is recommended to pay attention to the following details:

The design of the deflector is a key parameter of the product

When choosing one or another type of construction, it is important to take into account the conditions of the terrain, the nature of wind flows.
The material of manufacture must be durable and reliable. You can make a choice in favor of aesthetic plastic, but in strong winds it will not last for a long time.Vane and spherical rotating models are exposed to precipitation due to constant wind currents, so these types especially need to be made of durable material.
If the design includes moving elements, it is necessary to check them for the ability to move freely.

Such parts should always be kept clean.
Having decided on the design, you should choose the product of the desired size. The choice of size, as well as the design, depends on what the deflector is for and on what object it is installed.
It is necessary to take into account the coefficient of losses and rarefaction of air, these values ​​\u200b\u200bcan vary for each model.
When installing not on a ventilation pipe, but on a chimney, it is worth choosing nozzles made of a material that can withstand high temperatures.

Vane and spherical rotating models are exposed to precipitation due to constant wind currents, so these types especially need to be made of durable material.
If the design includes moving elements, it is necessary to check them for the ability to move freely. Such parts should always be kept clean.
Having decided on the design, you should choose the product of the desired size. The choice of size, as well as the design, depends on what the deflector is for and on what object it is installed.
It is necessary to take into account the coefficient of losses and rarefaction of air, these values ​​\u200b\u200bcan vary for each model.
When installing not on a ventilation pipe, but on a chimney, it is worth choosing nozzles made of a material that can withstand high temperatures.

What is a deflector in ventilation? With this ventilation pipe attachment, you can achieve high comfort for indoor use. At the same time, draft is improved, increasing the efficiency of air exchange circulation and exhaust air removal. In addition, the nozzle helps to maintain a long life of the chimney, protecting it from various debris and precipitation.

Installation of a chimney on the roof

There are two options for installing the deflector: connecting directly to the chimney and mounting on a piece of pipe, which is later put on the chimney. The second method is considered the best in terms of convenience and safety, because the most troublesome stage of work is done on the ground, and not on the roof.

Norms according to GOST

Excerpts from the current regulatory documents regarding the installation of a deflector on a pipe inform about the following:

• any nozzles on the smoke channel must be mounted in such a way that they do not block the path to the combustion products of the fuel;
• on a flat roof, the mouth of the pipe is supposed to be placed above the fences;

  There must be free space around the mouth of the pipe

• on a roof with slopes, the chimney head must be located above the ridge, if the space between them is less than one and a half meters, or at the level of the ridge, when the gap from the pipe to the highest point of the roof varies within three meters;
• the deflector must not be mounted on a site where an aerodynamic shadow is created due to neighboring buildings;
• the body of the device must be well ventilated regardless of the direction of the wind;
• rotating deflectors are not suitable for stove chimneys in houses built in areas with cold winters;
• installation of a round deflector on a brick chimney involves the use of special adapter pipes.

Required Tools

To install the deflector on the smoke channel, you need to find some tools and fasteners:

• electric drill;
• open-end wrenches;
• threaded studs;
• nuts;
• clamps;
• two ladders (one for climbing to the roof, and the other for moving along the roof).

In addition, to install the device on the chimney, you will need a piece of pipe. Its diameter should slightly exceed the size of the smoke channel.

deflector mount

The chimney is connected to the pipe, performing certain tasks:

1. On the prepared pipe section 10 cm from the edge, the points are marked where you need to drill holes for the fasteners. Similar marks are left on a wide section of the diffuser.
2. Holes are made in the pipe section and diffuser with a drill. The parts are temporarily connected to each other, checking if the top and bottom holes match. If this is not observed, then the products are recognized as defects, because the fasteners cannot be inserted evenly.
3. Studs are inserted into the holes. On both sides, both on the diffuser and on a piece of pipe, the fasteners are fixed with nuts. They are twisted evenly in order to protect the product from deformation.
4. With the manufactured device sent to the roof. The structure is put on the smoke channel and tightened with clamps.

In case of installation deflector for brick chimney you have to arm yourself with nails and a hammer

Acting as described above, you can mount any device, except for the weather vane deflector, since its design is rather non-standard.

In the case of using a device with a wind rose, 3 holes are created in the smoke channel with a drill.The holes are made at the same level in order to insert bolts into them a little later. These fasteners are immersed in holes when the annular part of the deflector-weather vane is placed in the chimney section. An axle is inserted into the bearing in the form of a ring, a cylinder, a device web and a cap are alternately attached to it. The weather vane deflector elements are combined with brackets or rivets.

The deflector can be confidently called a useful device that has a positive effect on the draft force in the chimney and the functioning of heating equipment. It is relatively simple to make and connect a fixture to a pipe, you just need to be “savvy” in choosing the type of deflector.

Mounting the deflector

There are two ways to install the structure - directly on the chimney and on a pipe section, which is then put on the chimney channel. The second method is much more convenient and safer, since the most time-consuming process is carried out below, and not on the roof. Most factory models have a lower pipe, which is simply put on the pipe and secured with a metal clamp.

Fixed deflector - photo

To install a homemade deflector, you will need a piece of pipe with a diameter slightly larger than the diameter of the chimney, and threaded studs.

Step 1.
At one end of the pipe, stepping back from the cut 10-15 cm, the drilling points for fasteners are marked along the circumference. The same marks are placed on the wide part of the diffuser.

Step 2
Drill holes in the diffuser and pipe, try on the elements to each other. The top and bottom holes must match exactly, otherwise the fasteners will not be able to install evenly.

Step 3
The studs are threaded through the holes and fixed with nuts on both sides on the diffuser and on the pipe.The nuts should be tightened evenly so that the deflector body is not deformed.

Step 4
They raise the structure to the roof, put the pipe on the chimney and fix it with clamps.

It is very important that there are no gaps between the elements in this area, and therefore it is necessary to tighten the clamp very tightly. Additionally, you can process the joint around the perimeter with a heat-resistant sealant

The installation of such a deflector is performed a little differently, since its design has certain differences. First, three holes are drilled in the chimney at the same level for the mounting bolts. The annular part of the device is inserted into the cut of the chimney and fixed with bolts. Next, an axle is inserted into the annular bearing, a cylinder is put on it, then a weather vane sheet, a protective cap. All elements are connected with brackets or rivets.

When choosing a deflector with a wind vane, remember that the bearings require regular lubrication, otherwise the device will not rotate. Also, icing of the hull should not be allowed, and frost should not be knocked off as soon as it appears.

Video - Making a deflector with your own hands

The chimney is one of the most important components of stoves and fireplaces.

Also a very important detail is the cap on the chimney, which ensures the correct and stable removal of combustion products.

It is quite possible to install a chimney cap with your own hands, but first you need to find out the characteristics of these devices, their main functions and the principle of operation. We will also find out what reasons contribute to smoke, that is, the occurrence of reverse thrust in the pipe.
A cap on a chimney pipe (it is also called an umbrella on a chimney, a visor, a chimney, a deflector, a weather vane) is an old architectural element that in our time bears the imprint of antiquity and refined taste. Some modern chimneys are a real work of art that makes the chimney original and the roof complete.

purpose

An umbrella is installed on the chimney in order to increase draft by deflecting air flows. Deflectors of the correct design prevent atmospheric phenomena from entering the chimney - snow, slanting rains (see).

Also, the chimney cap prevents debris and birds from getting inside. To do this, a mesh is installed, which at the same time freely allows smoke to be released outside.

Main functions

Thus, the chimney cap performs the following functions:

• traction gain;
• increase in the efficiency of the chimney pipe (up to 20%);
• protection from snow, rain, debris;
• an obstacle to the destruction of the brickwork of the chimney.

Chimney cap construction

• cover or umbrella;
• drip or tap for water.

A cover or umbrella is designed to protect against atmospheric phenomena entering the chimney. A drip or water outlet is designed to drain the flowing moisture from the top of the pipe, thereby reducing the formation of ice in the winter.

Materials used to make a wind vane

When planning to make a do-it-yourself chimney cap, you should use materials that are heat-resistant and corrosion-resistant. These characteristics have materials such as:

• galvanized iron;
• stainless steel;
• copper.

It is important to remember that chimney caps are located in hard-to-reach places.Based on this, it is necessary to choose a cap, which is made of quality material, and resistant, according to its characteristics, to various atmospheric phenomena

One of the most resistant is the cap on the chimney pipe, made of copper.

Errors and problems with the device

Incorrect operation may be the result of choosing the wrong size device - it can fall into the chimney pipe, blocking the way for the exit of combustion products.

The diameter of the deflector pipe must be equal to the diameter of the inner pipe of the chimney. If the chimney is brick, and the device has a circular cross section, then adapters will be required.

If the deflector pipe is slightly smaller than the diameter of the chimney pipe, then a wire can be used as a sealant by winding it around the base and thus increasing the outer diameter.

The second mistake is the choice of a rotating model for areas with cold and snowy winters, which leads to icing of the instrument and its snow cover.

The inefficiency of the deflector may occur if the installation location is incorrect:

• the case of the device is poorly blown by winds of various directions;
• in areas with gusty winds, an H-shaped deflector will be more effective;
• it is necessary to avoid installing the device in the zone of an aerodynamic shadow from trees and higher structures located nearby;
• the appliance must be located above the roof ridge and above other structures, if any, near the chimney.

The fourth problem is the breakdown of rotating models. Do not forget to periodically maintain the individual parts of the deflector, lubricate the bearings in time.

If the device was made by hand, and the material used turned out to be cheap and of poor quality, then the device will rust over time and will need to be replaced with a new one.

If a simple hood is installed instead of a deflector, then it can freeze and the products of combustion will remain in the house, which will lead to death if this happens at night. Therefore, you need to immediately install a deflector and not experiment with various visors-caps.

There are several models according to the degree of interaction with the traction mechanism.

• Active. This variety is distinguished by a built-in smoke exhauster in its structure, while it must work continuously throughout the entire time during which the fire is burning in the furnace. They depend on the energy source and are not used for heating systems with low power.
• Active-passive ones have a low-power smoke exhauster, which is necessary only in case of adverse weather factors (storm or calm), as well as with excessively intense combustion.
• Passive-active. In such modifications, the deflector independently generates its own thrust by a method that does not depend on the energy source.
• Passive-technological options, in which any own thrust is completely absent.

Depending on the aerodynamic mechanism of the chimney, the following are distinguished:

• incomplete device - assumes that in the space in which the deflector is installed, there is a special area of ​​\u200b\u200bstrong winding, the so-called pocket, where air, various gases and smoke mixtures accumulate;
• full open - in such designs there is no pocket, however, the wind can freely penetrate into the functional space of the device;
• closed - there is neither a wind pocket nor the possibility for air masses to penetrate inside the deflector;
• deflector-weather vane;
• vortex deflector.

Tips for making different types of deflectors

In order for a device aimed at improving the performance of the ventilation system to adequately cope with the tasks assigned to it, it is worth listening to some advice from experienced craftsmen. Choosing rotary models for installation in areas with snowy and cold winters is not the best option. There is a high probability of icing and snow filling the device in order to nullify all its functionality.

The picture shows a turbo deflector.

When preparing a drawing of a particular model for parts, you need to take a margin of 1 cm from each edge. This will allow you to make a high-quality and reliable connection.

With a sufficient level of skill, you can also try to make a rotary turbine yourself. However, it will be necessary to carefully prepare the drawings and cut out many petals of the same shape, which together will ensure the rotation of the entire installation.

Why you need a deflector

A device for greater ventilation efficiency helps to reduce the influence of various factors on its performance. Don't underestimate the need to use it. It often depends on atmospheric conditions how efficient the operation of the ventilation system will be. The lifting force ensures the circulation of air currents. This effect is obtained due to the difference in temperatures in the room and outside it. The wind will affect the operation of ventilation, complicating the process of natural air exchange or increasing its speed.

Outwardly, the turbo deflector looks like a cap, which is located at the top of the exhaust duct. Due to the operation of this unit, it is possible to reduce the negative impact that precipitation has on the equipment, to provide protection for the mine from debris. The resulting wind flows are redirected, which somewhat increases traction. To increase it, a structure made like an umbrella is installed inside the chimney. A deflector mounted on a house chimney that emits smoke ensures sparks are extinguished and reduces the risk of fire.

Drawing development and independent manufacture of the deflector

If you are not afraid of physical work and are familiar with the basics of design, it will not be difficult to make a deflector yourself. Start with a drawing

At this stage, it is important to know the height of the ventilation pipe and build on it. All required dimensions can be found in the table.

Inner diameter, mm	120	140	200	400	500
Device height, mm	144	168	240	480	600
Diffuser width, mm	240	280	400	800	1000

After completing the calculations and check their correctness. To do this, take a sheet of thick cardboard, cut out all the details and try to assemble a model of a turbo deflector for ventilation. If everything worked out, then you can proceed to the main work.

1. Using the elements cut out of cardboard as a template, transfer the dimensions to a sheet of tin.
2. Cut out the details of the future deflector with metal scissors.
3. Bend the edges of the blanks with pliers and tap them with a mallet.
4. Assemble the cone - this will be the diffuser body, fasten the edges with rivets.
5. Make holes along the edges for the bolts, connect the cone and the cylinder with them.
6. Assemble the lower cylinder and fasten it to the finished elements.
7. Attach the connecting strips to the finished deflector and use them to secure the device to the ventilation pipe.

If your ventilation system has many turns, then it is better not to risk it and buy a ready-made exhaust deflector. In this case, you can be sure of excellent efficiency and not be afraid for possible malfunctions.

Do-it-yourself deflectors

It is not uncommon to notice that on a particular chimney there is a certain metal tip. This is a deflector.

At its core, the tsaga deflector is nothing more than an ordinary metal pipe, on which the same metal umbrella is dressed. In turn, the pipe itself is dressed on the chimney. But for what purpose this is done, we will consider a little lower.

purpose

So, the deflector of the collet is designed to increase the draft of the chimney or ventilation system. Its principle of operation is as follows: from the laws of physics, it is known that warmer air is lighter than cold air. If the air is heated from below, then unheated air begins to press on it from above, since its mass is greater, respectively, the warm flow rises. The usual chimney system is based on this, that is, smoke, like more heated air, rises by gravity. However, colder air prevents it, since the chimney is a closed system. So, in order to reduce this pressure of cold air, that is, to reduce resistance, a deflector is installed that cuts through the air flow, thereby establishing a low pressure area (depression area) above the chimney or ventilation pipe. This, of course, increases traction.

The increase in draft contributes to the fact that the efficiency of the device that underlies, for example, if we consider a chimney, then it can be a stove, increases by 20 percent. This means that the combustion process will be much better without the use of additional fuels.

From all this we can conclude that the deflector tsaga is intended only to increase traction. However, there is a special group of such devices. We are talking about rotational products. Their essence lies in the fact that the central part rotates, which creates an even greater rarefaction of the air around, respectively, and the thrust increases.

Such deflectors also serve for forced ventilation, removal of gases and vapors from the room.

Application

So, it’s worth a little more detail on the areas of application of the deflectors of the tsaga:

• As already mentioned, this is an increase in the hood;
• Preventing the appearance of such an effect as reverse draft, that is, when the pressure of external air becomes much greater and the smoke, along with it, flows back inside through the chimney;
• Protection of the chimney or ventilation system from atmospheric precipitation.

Product design

If you plan to make a do-it-yourself tsaga deflector, then it will not be superfluous to consider its design, that is, to install all the individual parts that make it up:

• Lower cylinder or nozzle. It will be attached to the end of the ventilation system duct or the end of the chimney pipe;
• Diffuser. This part is represented by an expanded cone that goes from the nozzle to the top of the product;
• Pipe or shell. This is the outer part of the device;
• Cap or top cone.The part that is attached on top of the entire structure and protects the ventilation or chimney systems from precipitation;
• Legs for attaching the cap;
• Brackets for mounting the entire device.

Scheme of the deflector tsaga

It must be said right away that all these elements are made by hand from galvanized sheet or stainless steel. These materials can be found in sheet form in all hardware stores.

Self-manufacturing

So, in order to make a tsaga deflector with your own hands, it is necessary to calculate it in advance.

To do this, you should know some technical characteristics that such devices may have:

• deflector shape;
• Production material;
• deflector dimensions;
• His type.

Since we have decided on the type - this is the device of the collet of the design described above, it remains to determine all the other parameters of the future do-it-yourself deflector.

So, the calculation begins with the establishment of the desired form. Everything is simple here. The shape of the deflector directly depends on the shape of the pipe on which it is made.

Next, we decide on the material. Here, too, everything should be clear, since the optimal materials for do-it-yourself work were proposed above.

The next step is to determine the dimensions of the deflector. They, like the shape, directly depend on the size of the chimney or pipe of the ventilation system.

To simplify the calculation, you can take all the necessary sizes from the table:

Scope of use

Where exactly can turbo deflectors be used? Products have proven themselves in rooms and facilities where air exchange is urgently needed. Scope of use:

1. For private and multi-apartment buildings.In addition, it should be noted that increased requirements are imposed on the operation of ventilation ducts in a high-rise building. Often in such houses the quality of ventilation is not the best, as they were made back in the Soviet Union. But thanks to the use of a deflector, this problem is solved.
2. Turbo deflectors are good for livestock farms and for agricultural buildings such as stables, granary poultry houses and haylofts. They help ventilation to more effectively remove odors, fumes and gases generated by livestock. In addition, the humidity in the room is controlled, it is optimal.
3. For processing companies. Since the operation of the turbo deflector does not require electricity, the savings on the device are appropriate. An exception is enterprises that produce or process substances hazardous to humans.
4. Public buildings such as sports complexes, swimming pools, shopping centers and cinemas.

Important! The turbo deflector is also used to ventilate the under-roof space. Number of blocks: 18 | Total number of characters: 23820
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What is this device

As soon as housing is hermetically “packed” in a plastic “cocoon” and equipped with all kinds of noise and heat insulating materials, it becomes simply unbearable to live in it without ventilation. In order to create a healthy microclimate, we need to remove stale air from the premises and get fresh air.But today, ventilation without electricity or with electrical appliances is not just a flow system, but a complex complex of a number of components, including devices for ozonation and even air heating.

Regardless of which nodes your ventilation without electricity is equipped with, by installing a deflector, you will ensure its uninterrupted operation. This is an aerodynamic mechanism that is installed at the top of the ventilation pipe and is equipped with a "cap".

It solves two main tasks:

1. Prevents clogging of the channel with debris and dust.
2. Creates effective draft, activating ventilation.

Until the roof deflector was invented, the channels were made tapering to the top point. But with its appearance, it became much easier to organize good traction: the mechanism deflects the air flow and creates an area of ​​​​low pressure at the top, thus forcing the air from the house to rise up the channel.

Types and characteristics

Nowadays, there are many varieties of deflectors for ventilation, among them are the main ones:

1. Tsagi deflector;
2. Deflectors Grigorovich;
3. H - shaped deflectors.

There are open designs that are divided by shape:

• is flat;
• semicircular;
• with opening lid or gable.

According to the principle of work happens:

• rotary deflector;
• turbine.

Like a weathervane.

Next, we will analyze the most popular types of ventilation deflectors.

Chimney deflector

Very often deflectors are installed on the chimney, it is installed in order to provide good draft for smoke removal.Thus, the deflector increases the operation of the equipment by twenty percent, this increases the best burning of the fuel and improves heat transfer.

Also, installing a deflector prevents atmospheric precipitation and various debris from entering the chimney.

Deflector for air conditioner

Such designs are almost nothing like classic deflectors. They are screens - reflectors that redistribute the air masses produced by the air conditioner.

Therefore, air masses directed not at the person, but to the floor or parallel to the ceiling, dispersing without losing its pressure.

Rotary deflector

This type of deflectors increase the work of the natural supply and exhaust system by four times, and at the same time, such a deflector does not require connection to electricity.

The rotary deflector consists of a movable head with blades that are mounted on a base and attached with bearings.

The principle of operation of the rotary deflector is as follows:

The wind hits the blades and due to this, the head begins to move, thereby the air is discharged, and the thrust increases.

Thanks to the bearings, the head rotates at a constant speed, even in strong winds.

Vane

Deflector - a weather vane is a special device, the body of which moves along with curved visors, they are connected to a bearing mount.

A weather vane is located on top of the structure, it allows the entire device to always be “downwind”.

This device works like this: air masses pass between the visors, accelerate and make a rarefaction zone, due to this there is an increase in traction, the fuel burns out better and air exchange improves.

Such designs are good to use to prevent backdraft, flame extinction and sparking.

Such a design can be made independently, for this it is necessary to install the structure on the cut of the chimney pipe, the bearing assembly and the ring will serve as a fastener.

Base deflector

Such deflectors are designed to ventilate basements and rooms, as well as to remove moisture. Such devices can be used in both forced and natural ventilation systems.

Another basement deflector prevents various small animals, dirt, and meteorological precipitation from entering the basement.

The length of the deflector pipe is easy to adjust and, if necessary, it can be increased or sawn off to the desired height.

And so in the article we described the types and principle of operation of the ventilation deflector, we hope that this information was useful to you. Good luck!

Installation steps

1. If the ventilation duct is located at a distance of more than 3 meters from the ridge: its opening must be no lower than the conditional line passing from the horizontal line of the ridge down with a slope of 10º.
2. If the ventilation duct is located at a distance of 1.5 to 3 meters from the ridge: its opening can pass at the level of the ridge.
3. If the ventilation duct is located at a distance of up to 1.5 meters from the ridge: its opening should be at least 50 cm higher above the level of the ridge.

Possible problems and solutions

1. Deterioration of work: slowdown of rotation, extraneous noise during rotation. A possible reason is mechanical damage (for example, if a tree grows near the house, a branch may fall on the deflector, or strong hail may bend the plates).In this case, you need to inspect the turbo deflector, if possible, dismantle and repair it.
2. A sharp drop or complete absence of draft in the duct in severe frost. Possible cause is freezing. This can only be noticed during inspection (either climb to the roof, or from the ground - if the deflector is clearly visible). To solve the problem, you will either have to wait for the temperature to rise, or go upstairs and clean the product from ice.
3. Full stop of rotation, slowdown of rotation. A possible reason is that the bearings are jammed (if no other damage is visually visible). In this case, the turbine will have to be removed and the bearings lubricated or replaced.

To prevent problems, it is enough to inspect the plates once a year and lubricate the bearings. It is best to do this after winter - since severe frosts are the most "dangerous" season for such products.

Litol is suitable for lubricating bearings. To update the lubricant, you need:

1. Remove turbine.
2. Using a puller, loosen the retaining ring.
3. Bearings - lubricate (or replace, if necessary), and assemble and install the product in place.

What are turbo deflectors and weather vanes

Designs can be safely combined into one group, because they are not only similar to each other, but also have a similar principle of operation.

If we consider the drawings of turbo deflectors, we can pay attention to the fact that the distinguishing feature of the devices is the spherical shape of the rotary devices with blades in the form of semicircles that rotate under the influence of wind force. In this case, rarefied air, which increases the efficiency of the hood, is formed inside the sphere above the pipe head.

The productivity of the weather vane is ensured by the fact that the blades of the device are always turned "back" to the wind, thereby preventing air flows from entering the channel. Behind the body of the structure, a low-pressure zone is formed, the so-called aerodynamic shadow, which contributes to the rapid removal of polluted air from the vertical channel.

Among the advantages of the ventilation turbo deflector are:

• protection of the ventilation duct from overheating in summer, which reduces the cost of cooling the room on hot days;
• preventing the formation of condensate under the roof by regulating the temperature in the heat;
• no need to connect the device to the electrical network;
• ensuring efficient operation, because the productivity of the turboreflector is in some cases 200% higher than that of static models.

The main advantage of the turbo deflector is the absence of the need to connect the device to the mains

The nozzle has an attractive appearance. The device looks like an elegant spherical cap. After installing the deflector, excess heat, moisture, small contaminants and carbon monoxide vapors are independently drawn out from the shaft and the under-roof space. This increases the useful life of important structural elements of the building.

Before purchasing a ventilation turbo deflector, you should also familiarize yourself with the main negative aspects of the device:

• if there is no wind on the street, the blades of the structure will not rotate and, accordingly, the thrust will not improve;
• deflector rotation units require constant maintenance, at least regular lubrication;
• if not noticed in time, complete or partial freezing of the nozzle is possible;
• design features do not allow the device to reliably protect ventilation from the penetration of precipitation, especially on windy days;
• in strong winds, there is a possibility that a jammed weather vane will lose integrity.

Mounting the deflector on the pipe

Ventilation deflectors are mounted on the roof of the room. Installation of the product is carried out directly on the air duct or on. When installing the deflector on the duct, several rules should be considered:

1. The deflector must be installed in such a way that it is blown by the wind in any of its directions.
2. It cannot be mounted in areas of aerodynamic shadows, for example from a neighboring building
3. To create an air draft, the deflector must be mounted at a height exceeding the roof level by 1.5-2 meters.
4. The galvanized deflector is designed for extracting non-aggressive air masses.
5. Installing a damper / gate in the ventilation duct in front of the deflector will avoid excessive draft in strong winds.