Types of chimney deflectors and making them yourself

Here you will learn:

• Purpose of the deflector
• Operating principle of deflectors
• Design and types of deflectors
• Which deflector is better for a chimney?
• How to make a TsAGI deflector for a chimney pipe with your own hands
• DIY Grigorovich deflector
• Deflector-vane
• How to install a deflector

This is a metal cap made of galvanized or stainless steel that fits onto the top of the chimney or roof vent unit.

The deflector's operation is based on Bernoulli's physical law, according to which, when the lumen of the exhaust pipe narrows, the air flow speed increases. As the flow rate increases, the exhaust gases become rarefied, creating a low-pressure area that produces draft. According to calculations, installing a deflector on a chimney increases the efficiency of the heating system by 20-25%.

The deflector consists of several elements - a metal pipe that is installed on the chimney, a diffuser, an outer ring and a protective element (umbrella).

Important! The design of the deflector is quite simple, and if necessary, you can make it yourself. This requires a sheet of galvanized or stainless steel and fasteners to connect the components together. But you can also purchase ready-made designs in accordance with the diameter and location of the chimney.

Purpose of the deflector

Installing a deflector allows you to solve the following problems.

1. Protect the chimney pipe from clogging and moisture. During the off-season period, birds can make nests on it, the chimney becomes clogged with snow, and a large amount of water gets into it when it rains. The deflector completely eliminates the occurrence of such problems.
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   Without a deflector, the chimney quickly becomes clogged and needs to be cleaned

2. Reduce the negative impact of climatic factors on chimney draft indicators. As already mentioned, weather conditions can be so unfavorable that they cause backdraft, a very dangerous phenomenon.

   In the presence of reverse draft, smoke and carbon monoxide go into the room and not into the chimney

3. Increase the efficiency of chimneys within 15–20%. Due to this, it becomes possible to regulate their minimum length, improve the appearance of the building facade, and reduce the cost of installing elements.

   The deflector allows you to minimize the cost of installing a chimney

4. Extinguish sparks. This is an additional function of the deflector and is important when determining the fire safety category of the roof.

   The deflector extinguishes sparks, preventing accidental fire

The deflector consists of three main elements: a diffuser, an umbrella and a body. The diffuser changes the speed of movement of combustion products in the chimney pipe, the umbrella protects it from water and debris, and the housing cuts through air flows and creates a vacuum to increase draft. There are modifications with an installed protective mesh, but this addition slightly worsens the performance characteristics of the deflector.

Standard deflector design

The action of the deflector is explained by the Bernoulli effect: the speed of air flow has a direct relationship with the pressure in the channel. Air increases the speed of movement in a narrowed diffuser, due to this the pressure in the housing decreases and the draft in the chimney increases.

The mechanism of action of the deflector is based on the Bernoulli effect

Operating principle of deflectors

Operating principle of deflectors

The standard device includes three main elements - a cylinder, a diffuser, and a protective cap (umbrella). Additionally, the design is equipped with ring bumpers, which are located in the lower part and around the diffuser. There are several types of deflectors that differ in shape, size and number of elements, but all of them, regardless of type, work on the same principle.

Deflectors

The structure is installed at the very top of the chimney and creates an obstacle to air flow. When the wind hits the walls of the cylinder, it loses its strength and breaks up into many small air currents of low intensity. Some of them rise up the body and capture the smoke coming out of the chimney. This is what increases draft in the chimney duct.

Due to the absence of turbulence, smoke and carbon monoxide do not fall back into the pipe, but are completely removed outside. In addition, the deflector prevents the pipe from clogging through the top and performs decorative functions.

Decorative deflectors

It has been proven that after installing the deflector, the efficiency of the heating device increases by 15-20%. Of course, the deflector itself will not give anything if the chimney is not installed high enough or the cross-section of the connecting pipe is incorrectly selected. The location of the pipe on the roof also matters.

Design and types of deflectors

Despite the existence of many models of deflectors, they are basically built using the following structural elements:

• inlet pipe with nipple or flange connection;
• an outer cylinder, which is called a diffuser;
• housings;
• a cone-shaped cap called an umbrella;
• brackets for attaching an umbrella.

Some deflector designs may use two cones—direct and reverse. The first serves as protection against precipitation, and the second serves to redistribute the flow of combustion products.

Various deflectors have common structural elements

For making deflectors with your own hands, galvanized sheet or stainless steel is best suited. In addition to these materials, the industry has mastered the production of devices with a protective enamel layer or a coating of heat-resistant plastic.

Among the many deflectors that you can make with your own hands, there are several of the most popular designs.

Deflector-vane

This reflector has a rotating part (wind vane), which rotates when the wind direction changes. In this case, the deflector curtain shields the chimney from incoming air masses and contributes to the appearance of vacuum on the leeward side. Thanks to this, active suction of combustion products is carried out, which eliminates backdraft and the formation of sparks.

The deflector with a wind vane can be rotated, orienting the reflector exactly across the direction of the wind

TsAGI deflector

The TsAGI deflector is a universal device that can be installed on any pipe - stove, exhaust or ventilation. Developed at the Central Aerohydrodynamic Institute named after. Zhukovsky device has a simple design with an open flow path and protection against reverse draft. There are two types of TsAGI reflectors, designed for external or internal installation. Thanks to its many advantages, this type of deflector has gained wide popularity among home craftsmen. However, the design is not without its drawbacks. The “weak link” is the narrow passage section, which can be blocked by a layer of ice on the inner cylinder. In addition, the TsAGI deflector is not effective enough in low winds and calm conditions - in these conditions its design creates little resistance to natural draft.

The TsAGI delector has a simple design and excellent performance characteristics

Disc-shaped

This deflector got its name because of several cones (plates) in its composition and refers to devices with an open flow path. The reflector has a protective umbrella combined with a cone and a lower part in the form of a cap with a hole for smoke exit. The vacuum occurs due to the plates directed towards each other, which form a narrowing channel for incoming air flows.

In a disc-shaped deflector, vacuum occurs in the gap between the cones directed towards each other

Round "Volper"

The device has a design similar to the TsAGI reflector. The differences concern only the upper part of the deflector. A cap that protects the inside of the chimney from debris and precipitation is installed on top of the diffuser, which eliminates some of the shortcomings of the device developed at TsAGI. Zhukovsky.

"Volper" has minimal differences from the TsAGI traction amplifier, which provide it with advantages in the absence of wind

Grigorovich deflector

One of the most repeatable designs is the improved TsAGI deflector. The smoke that comes from the chimney passes through the narrowing channel of the diffuser, thereby increasing its flow rate. The Grigorovich deflector is best suited for chimneys installed in lowlands and areas with weak air flow, since it is able to provide good draft even in complete calm.

The Grigorovich deflector is an ideal solution for areas with weak air currents

H-shaped

Deflectors, the silhouette of which resembles the letter “H”, are designed to equip chimneys of powerful stoves and boiler plants. In such devices, the exhaust gas flow is divided into two parts and accelerated out through two side diffusers. The advantages of the design include a significant improvement in traction when air masses move in any direction. In addition, the H-shaped deflector does not require the installation of a canopy, since the mouth of the chimney is protected by the transverse pipe of the device.

H-shaped draft amplifiers are designed for installation on chimneys of powerful heating units

Rotating

The device is made in the form of a sphere with many curved side blades. The presence of blades allows the device to rotate in a certain direction and work like a turbine. Rotary deflectors are best suited for gas boilers and do an excellent job of protecting the chimney from debris and precipitation. The disadvantages of devices of this type are their low efficiency in icing conditions and lack of wind.

Numerous rotating deflector blades create thrust like a turbine

Classification of wind nozzles

When choosing wind nozzles, you need to decide on a number of important points in order to make the best option for yourself. It is necessary to determine the following characteristics:

• material;
• principle of operation;
• design features.

The first thing you need to pay attention to is the material from which the deflector is made. Stainless or galvanized steel, ceramics, plastic, copper are used in production.

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More often they choose steel or aluminum nozzles; they are not very expensive and are not inferior in quality. Copper models are used less frequently due to their high price. A good option for quality and decorativeness are metal attachments coated with plastic. When choosing a material and color for the deflector, it is advisable to match it to the facade of the house.

The next criterion for choosing a nozzle is the operating principle. Depending on the functionality, deflectors are divided into 4 types:

1. Static deflectors. They have a simple design and are easy to install yourself. Used in apartments for exhaust ducts.
2. Rotary. Consist of rotating blades and a static part.
3. Static installations with ejecting fan. Refers to modern technologies. It consists of a fixed hood, inside the shaft there is an axial fan. It turns on only when necessary, if the wind force is not sufficient for the functioning of the static deflector.
4. With rotating body. It consists of a horizontal and vertical pipe, which are connected by a hinge. The design also includes a weather vane.

Which deflector is better for a chimney?

The choice of reflector is a purely personal matter. Most often they use TsAGI - reliable and unpretentious, suitable for both chimneys and ventilation pipes.

Is it possible to install a deflector on a gas chimney? Need to. You will not only save fuel and increase the efficiency of your gas boiler, but you will also receive additional increase and stabilization of draft and a reduction in the likelihood of reverse draft - a dangerous phenomenon that can occur on very windy days and lead to poisoning by combustion products.

The most important question

Before selecting or making a deflector for a pipe, you need to decide - is it needed at all? The deflector may freeze, be covered with soot or carbon deposits (coked), clogged with fallen leaves, wind-blown debris or dust. In any of these cases, if the deflector is on the chimney, the inhabitants of the house are at risk of getting burned. The deflector does not increase the efficiency of a furnace or boiler much, but it requires regular inspection and cleaning. At least once every 3 months for solid fuel stoves and at least once every six months for gas, liquid fuel or pyrolysis stoves and boilers. For more information on the dangers that can result from installing an unsuitable deflector on a pipe, see the video:

Video: what are the dangers of deflectors, umbrellas and weather vanes on a chimney?

Therefore, if you have an old wood or coal stove, but the draft is not good and the wind is blowing into the chimney, instead of a complex deflector it is better to install a simple chimney, for example. umbrella or tent. And in other cases, you need to thoroughly understand which deflector is needed for this particular stove/boiler with this particular chimney. It is also important not to confuse a smoke deflector with a ventilation one - small traders and the authors of some popular publications do not see or do not make the difference between them.

How to make a TsAGI deflector for a chimney pipe with your own hands

The process of developing and assembling a deflector for a chimney consists of four stages: drawing, creation of blanks, assembly, installation of the structure and its fastening directly to the chimney.

Required Tools

You will definitely need:

• a sheet of thick paper for drawing and layout;
• marker for marking;
• riveter for connecting structural elements;
• metal scissors for cutting out parts;
• drill;
• hammer.

The choice of base material depends on the design and type of device. When creating static deflectors for a round chimney pipe at home with your own hands, it is best to use sheet metal. Galvanization is the most commonly used, it is affordable and durable.

Don’t forget about the necessary tools before installing the deflector

Development of a drawing of a TsAGI deflector model

There is an algorithm for how to make a deflector for a chimney pipe with your own hands. It is recommended to perform the first stage on paper. First you need to calculate the dimensions of the diameter of the nozzle and the upper cap of the structure, and also calculate the height of the reflector.

For this, special formulas are used:

• diameter of the upper part of the deflector - 1.25d;
• outer ring diameter - 2d;
• height of the structure - 2d+d/2;
• ring height – 1.2d;
• diameter of the cap - 1.7d;
• the distance from the base to the edge of the outer casing is d/2.

Where d is the diameter of the chimney.

To make the task easier, a table containing ready-made calculations for standard sizes of metal pipes will help.

If the chimney has a non-standard width, then all calculations will have to be done independently. But, knowing the formulas, it is easy to measure the diameter of the pipe and determine all the necessary indicators to use them when drawing up drawings.

The further ease of assembling the structure will depend on the correctness and accuracy of the paper patterns. It is required to prepare drawings for the main parts: diffuser, inlet, ring and umbrella.

When the patterns are made, it is recommended to first assemble a paper prototype of the future reflector. Even if you are an experienced craftsman and are sure that you can design a deflector for a stove chimney with your own hands without any problems, you should not skip this stage, since it will help you identify possible errors and shortcomings, and correct the calculations or drawing. Only after creating the correct paper layout, which confirms that the deflector diagram is accurate, can you move on to the next stage.

Step-by-step instruction

There is an order of work that must be followed, otherwise you will not be able to connect the individual parts of the chimney deflector yourself with your own hands.

The procedure is as follows:

1. Using paper blanks, transfer the template to the surface of the metal from which you plan to make the reflector. Carefully trace the outlines of the paper parts. You can use a permanent marker, special chalk, or even a simple pencil for this purpose.
2. Using metal scissors, cut out the blanks of the necessary structural parts.
3. Along the entire contour of the cuts, the metal must be bent by 5 mm and carefully passed with a hammer.
4. Roll the workpiece into a cylinder shape, drill holes for fasteners so that you can connect the structure with rivets. Welding is permitted, but not arc welding. You need to be careful not to burn the metal. Choose the distance between the main fastening points from 2 to 6 cm, it varies depending on the size of the finished structure. The outer cylinder is rolled up and fastened in the same way.
5. By bending and connecting the edges, make the remaining parts: an umbrella and a protective cap in the form of a cone.
6. You need to cut fastening elements from a galvanized sheet - 3-4 strips: width 6 cm, length - up to 20 cm. Bend them along the entire perimeter on both sides and go over them with a hammer. From the inside of the umbrella, you need to drill mounting holes, stepping back from the edge by 5 cm. 3 points will be enough. After this, secure the metal strips to the cap with rivets. Then they must be bent at an angle of 90 degrees.
7. Connect the diffuser and cone using rivets to the inlet pipe. Having made a deflector for a round pipe with your own hands, you can begin installing it.

A Volper chimney deflector can be created using a similar method. Its design is very similar to the TsAGI model, but there are some differences in the upper part. They are also made of stainless steel, galvanized or copper.

Do it yourself or buy a device?

The question of whether it is advisable to purchase a deflector worries thrifty homeowners. This is not surprising, because the simplest device costs about 17-18 dollars. The average purchase price is $45-60.

The options for weather vanes offered by manufacturers and private companies are very diverse. Some models are made so skillfully that they look like a real work of art

In this case, making the device will not be difficult. And the aesthetic component does not always come first. Sometimes a deflector is needed for the chimney of a boiler heating a garage or other utility room.

The cost of the simplest deflector options starts at $17. To buy a Khanzhenkov, TsAGI or Volpert-Grigorovich model made of galvanized steel you will need up to $50. Moreover, these can be factory products or handmade ones.

The efficiency of the device does not depend on the manufacturing method. The main thing here is to choose the correct diameter of the product and the right model that can meet the needs of a particular chimney.

When purchasing, you should pay attention to the characteristics of the deflector:

• material type;
• metal thickness;
• diameter of the pipe for mounting on the chimney pipe.

Manufacturers also offer stainless steel options. They differ in cost - the price of rotary stainless steel models can reach $140 or more.

The most common deflectors used for chimneys in private houses, cottages and baths: TsAGI, round “Volper”, H-shaped, star-shaped “Shenard”, Grigorovich and open Astato.

For chimneys on the roofs of houses located in areas with gusty winds, N-shaped deflector options are often chosen

Whether to buy or build a traction amplifier is a matter of individual decision. For those who like to do something around the house, this task will be a pleasant and interesting activity.

If you don’t have any tools or skills for doing housework, then it will be easier and more convenient to purchase a finished product, choosing the most suitable model that will not stand out from the overall picture of the roof.

Now it’s not a problem to choose a deflector model that can organically fit into the roof composition

When purchasing or making your own device, it is important to consider the material of the roof covering. If it is a flammable material, then it is imperative to provide a spark arrestor. This is an important point that ensures the safety of all family members living in the house.

DIY Grigorovich deflector

The most popular type of smoke vent is the Grigorovich deflector. It has a simplified design and therefore can be created with your own hands without much difficulty.

The lower cylinder of the Grigorovich deflector includes several pipes. In addition to it, the main parts of this type of weather vane are the upper cylinder, the conical element and two brackets for attaching the product to the chimney.

It is more reasonable to create the Grigorovich deflector from tin and steel, coated with zinc or created specifically for the manufacture of boilers. The recommended material thickness is 0.5 mm.

The most important parts of the Grigorovich deflector are the diffuser, cap and reverse cone

Despite the excellent ability of the Grigorovich deflector to enhance draft and protect the chimney from the penetration of foreign objects, it has one significant drawback - poor performance in low wind conditions.

The Grigorovich deflector is manufactured in stages:

• Prepare tools (tape measure, ruler, felt-tip pen, cardboard, metal scissors, drill, drills and screws) and materials (metal sheets and strips).
• Determine the dimensions of the device. Wanting to simplify calculations, they use formulas for the ratio of deflector parameters. According to them, the height of the deflector is 1.6 times the diameter of the chimney, the width of the diffuser is 1.2 times the diameter of the smoke channel, and the width of the hood is equal to two diameters of the chimney.
• A drawing of each part is drawn up on a cardboard sheet. The resulting templates are cut out and connected to each other, checking that their dimensions correspond to the correct parameters.
• After making sure there are no errors, the contours of all cardboard parts are traced on metal sheets. The blanks are cut out with metal scissors.
• By folding one of the parts, a cylinder is formed - the diffuser body. Two holes are drilled along the edges of the product into which self-tapping screws are inserted.

The first step is to create such a part as the deflector body

• By analogy with the manufacture of the diffuser body, an outer cylinder is created. Next, they make the cap of the device, that is, they roll two metal blanks into cones, and their edges are joined.
• In the upper cone, which is slightly larger than the lower one, 6 legs are cut out and bent. A lower cone is attached to this product with its edges, which is pre-equipped with claws for connection to the diffuser.

The deflector cap is equipped with legs that will help it connect to the cylinder of the device

• The manufactured umbrella is connected with the legs to the inner cylinder (diffuser). After this, it is placed in the outer cylinder.

The Grigorovich deflector has a simple design

Review of popular models

Let's take a closer look at the most common models of deflectors.

Ventilation deflector Tsaga

This model is considered the most popular. This device has a larger diameter than the chimney. Air flows flow around the device from all sides, as a result of which areas of high pressure are formed on the sides, and a vacuum occurs in the rear and front zones, increasing traction.

The design of such a product eliminates the protection of the chimney duct from precipitation. Therefore, after installing this device, additional installation of a protective cap is required.

The Tsaga deflector is suitable for use in both chimney and ventilation systems

Disc-shaped

A simple model that ensures fairly efficient operation of the system and high traction. The two main elements of the device form a protective canopy that prevents snow and rain from entering the chimney channel.

The lower part of the visor is covered with a cap, which is directed towards the chimney. This design allows the device to cope with the tasks assigned to it. The air flow can enter such a deflector from any side and, finding itself between the cones that form a narrowed channel, cause a vacuum.

Ball-shaped "Wolper"

This model has an almost identical device to the TsAGI deflector. However, there is one difference - the canopy, which protects the chimney channel from precipitation and debris, is located above the diffuser.

Grigorovich deflector

A very popular deflector model that increases draft in chimney and ventilation structures. This deflector is easy to assemble with your own hands. The design of this device includes the following components: a lower cylinder with two pipes, an upper cylinder, a cone and two brackets.

The smoke coming from the pipe ends up in the narrowed channel of the diffuser, causing a vacuum to occur. To assemble such a device, as a rule, a tin sheet or galvanized steel plate is used.

The Grigorovich deflector has a very simple design and is often made by hand

H-shaped

This model is used mainly in manufacturing plants or boiler houses that have high power. The installation of an H-shaped deflector occurs as follows: a pipe of a similar size is attached to the mouth of the pipe. In the central part of the pipe there is a special insert, which ensures a tight connection of the device with the chimney pipe. Two more tubes are fixed to the transverse pipe on the right and left, resulting in a device resembling the letter “H” is formed.

This design does not require a protective canopy, since the mouth of the chimney is already protected by horizontal parts. The H-shaped deflector enhances traction in any direction of air flow.

Rotating

Such a device rotates only in one direction. The circular motion provides additional efficiency of the device. In addition, this model provides protection for the pipe from precipitation and debris. Often used for gas-fired boilers.

Important! It is worth considering one disadvantage of a rotating device - the deflector rotates due to air flows, so it does not function in calm conditions. When icing occurs, the rotating exhaust pipe deflector is also useless.

Deflector "weather vane"

This model includes a rotating body. This device includes the following elements: weather vane, visors, bearing assembly. The rotation of the device is carried out due to the force of the wind acting on the weather vane. The weather vane type chimney deflector works on the principle of a ship's sail.

Deflector-vane

The weather vane deflector is assembled from such parts as:

• a half-cylinder that serves as a barrier to strong winds;
• a cover that blocks the entry of various debris into the chimney;
• a canvas that rotates in accordance with the direction of the wind;
• a central axis communicating with each element of the device;
• a thrust bearing that performs the task of additionally securing the device on the smoke duct.

Compared to other draft leveling devices, the weather vane deflector is an improved device. It functions on the principle of a ship's sail. The weather vane deflector features a rotating body that moves under the influence of the wind.

The weather vane deflector is constantly in motion, so it easily improves traction

The manufacture of a weather vane deflector is the following process:

• The lower and upper cylinders are cut and formed from metal sheets. To what will be below, racks are attached to the nuts and bolts. After this, the upper cylinder is attached to the structure, to secure which a clamp is taken. At the edges of the posts, using rivets, a reverse cone is fixed, thereby obtaining a base for the weather vane.
• A fragment 12.5 cm long is cut from a pipe with a diameter of 1.3 cm - a support for the weather vane. One edge of the pipe is supplemented with the thread necessary for fastening. A bearing is inserted inside the product, and two steel strips are welded on the sides, tilted in the same way as a dome. It is important that the plates do not become obstacles to the movement of the structure in a circle.

​​​​​​​

To install the bearing, a thread must be made on the pipe

• Using a compass, they install a compass rose - steel rods on which the letters are attached. The rotating structure is covered with a cap in order to block moisture from entering the housing.
• A cap made of steel and shaped like an arrow is put on the pipe thread. A flag with a counterweight is attached to it.

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In fact, a weather vane deflector is an improved version of a conventional device

How to install a deflector

It is possible to install a deflector on the pipe only if the chimney is made exactly according to the rules of SNiP 41-01-2003, pos. 1 in Fig. below. It is highly desirable that the pipe on which the deflector will be installed is located on the roof slope leeward relative to the direction of the prevailing winds. For reference, leeward means opposite to the direction from which the wind is blowing.

Correct location of the chimney and fastening the deflector to the brick pipe

It is certainly possible to attach the deflector to the otter (the upper extension of the brick pipe) only if the pipe was originally designed for the deflector. If not, or there are even the slightest irregularities in the pipe laying, the deflector must be attached to it as shown in pos. 2 rice:

1. A strong sleeve (glass; square-circle adapter) C is inserted into the pipe;
2. The glasses are secured with blind anchors A at a level no higher than the bottom row of the otter masonry and with embedded pins Z in the grooves at the mouth of the pipe. Anchors and mortgages are walled up with cement-sand mortar from M200;
3. A diffuser/skirt D with a cornice (reflection) K is placed on the glass. Mandatory for a deflector of any design, incl. imperfect!
4. The diffuser is attached only to the masonry with small anchor bolts. Not with self-tapping screws in plastic dowels! The skirt/diffuser is not attached to the glass!
5. The working structure of the deflector is firmly secured to the collar (top edge) of the skirt/diffuser.

Only with this method of fastening will the deflector never loosen an old and/or undesigned brick pipe.

Installation technology

Before installing a particular deflector on the roof, you need to familiarize yourself with the recommendations from the manufacturer and the standards that are specified in the regulatory documents. For example, some of the requirements are present in SNiP 41-01 of 2003. They apply to heating, ventilation and air conditioning systems.

Among the recommendations, we can highlight several comments on the overall height, depending on the removal of the deflector on the exhaust pipe relative to the top point of the ridge strip:

Diagram of the dependence of the height of the wind nozzle on the distance to the top point of the house Source drova-pil.ru

• less than 1.5 meters - the cap rises by more than 500 mm (the same happens on flat roofs, only an enclosing structure is used as an additional guideline - the exit should be higher);
• from 1.5 to 3 meters - at the same level or with a slight excess;
• more than 3 meters - the lower limit is limited by the intersection of a vertical and inclined line relative to the horizon 10 degrees down.

There are also a number of general recommendations. For example:

• a ventilation duct and a chimney located at a close distance must be vented outside using air ducts of identical height (otherwise there is a possibility that one or another exhaust medium will flow back);
• the area for installing the deflector is chosen to be open and out of the influence of aerodynamic structures from neighboring buildings (the airflow must be free);
• rotating types of nozzles are not acceptable for servicing chimneys in regions with cold winters;
• in climates with frequent gusty winds, it is better to consider H-shaped devices;
• connection of pipes of different geometric cross-sections is permitted only with the use of appropriate adapters.

It is more convenient to start installing the air duct deflector by attaching it to the pipe, and then installing the assembled structure on the air duct or chimney.

Roof-ready structure Source forsler.by