How to make a deflector on the chimney with your own hands?

The normal operation of any thermal unit requires the presence of a chimney. It is important at the same time to ensure a good draft, which will guarantee the operation of the furnace, boiler or fireplace. Many owners of private houses face a problem that is expressed in poor draft, it can be caused, for example, by a strong wind. To solve such problems today it is customary to use a deflector on the chimney.

The need for a deflector

The described part of the chimney is a device that is located at the very top of the structure. It can be located at the end of the ventilation duct. If you select the right view, and also the size of this device, you can achieve an increase in the efficiency of the equipment by 20%. Among other things, the deflector on the chimney serves as a protection against rain, birds, small animals, debris, dust and snow. The installation of this part of the heat unit is especially effective when it is not possible to equip the smoke channel in such a way that it is direct.

Deflector device

The described components of the chimney of different types, as a rule, have the same structure. Among the constituent parts it is possible to distinguish the inlet branch pipe, body, umbrella, the latter of which has a conical shape. It does not dispense the deflector on the chimney and without the brackets for fixing the hood, as well as the outer top cylinder, which is called the diffuser. As a material for manufacturing, the most common are galvanized iron sheets. Recently, the products made of metal covered with a protective layer of plastic or enamel have found a rather wide distribution. For installation on ventilation ducts where there is no air outlet with increased temperature, it is possible to use deflectors made of plastic.

Defining parameters

Before you start work, you need to make a calculation. The basis should be taken internal diameter of the chimney, which will determine the width of the diffuser and the height of the deflector. Thus, with a diffuser width of 240 millimeters and a deflector height of 144 millimeters, the inside diameter should be 120 millimeters. With the increase of the first value to 1000 millimeters and the second to 600, the desired value becomes 500 millimeters. As an alternative solution, you can use a ratio that will help to make the correct calculations. Thus, the height of the deflector is 1.6-1.7d, the width of the diffuser should be 1.2-1.3d. At the same time, the width of the umbrella is equivalent to 1.7-1.9 d. Here, "d" is the inner diameter of the chimney.

Preparation of materials and tools

If you make a deflector on the chimney, then there will be no way without a tape measure, a welding machine, an electric drill, galvanized iron cloths , and metal scissors. Each master probably has a Bulgarian, a set of locks, as well as bolts and nuts. It will take a strip of metal.

Manufacturing technology

If you decide to make a deflector on the pipe, then after the calculations you can start to make the composite elements of the structure. With the help of a pencil, the master should depict the relevant parts, namely the hood, outer cylinder and diffuser.

Specialists recommend making a life-size scale using cardboard. After this, the workpiece will need to be transferred to the surface of the metal. Using scissors for metal, you need to cut out all the components that were listed above, as well as the cone. Rivets and a welding machine, which can be replaced with small bolts, will allow to connect all the parts together. From the metal strip, you need to prepare the brackets to fix the hood. In order to save material, the metal strip must be cut into thin strips along.

Features of work

When you make a deflector on the pipe, the brackets for fixing the hood should be fixed to the outer surface of the diffuser, which has a conical shape. To the hood will need to strengthen the cone. After all the details have been completed, the master can begin the assembly manipulations, performing work on the chimney.

Assembling

Below, an example will be described, which involves the installation of a deflector on a metal chimney with an internal diameter within 120 millimeters. The lower cylinder must be mounted on the flue pipe using a bolted connection. On the lower cylinder, the clamp should be fastened with the upper one. Brackets allow to fix the cap-umbrella and the reverse case to each other. When the deflector is installed on the chimney with your own hands, it is important to mount the return cone under the hood. This will ensure effective functioning even under conditions that are characterized by a grass-roots wind. In the presence of an impressive diameter chimney, it is necessary to ensure a qualitative fixation. For this purpose it is customary to use additional stretches, which are made of metal wire.

Additional recommendations

If you independently manufacture the deflector chimney, the drawing will guarantee success. Since it determines the design features and dimensions of the future product. Caps are capable of removing combustion products, but it is important not only to properly execute and assemble such a device, but also to install the technology. The competent organization of removing soot and smoke is not only a matter of taking care of the environment and heating appliances, but also a very important factor in the safety of tenants. The deflector on the chimney of the gas boiler is not installed. But in all other cases it is important to know about certain provisions. To fix the structure, which has a circular cross section, it is necessary to use a transition nozzle. This is true for gas flues of boilers that have a square or rectangular shape. If there is a chimney flue or a boiler that is too large, a special foot must be fixed to the deflector. They are a kind of prop, made of steel. The transition from the brick chimney of the boiler or the furnace to the circular section of the deflector is performed only after the masonry has been inflated. It is forbidden to install deflectors on the chimneys, which are part of the gas boiler. This prohibition applies to the installation of a deflector on the flue gas ducts of boilers that operate at the expense of gas and is regulated by SNiP 2.04.05.

Conclusion

The air duct deflector of the heating equipment acts as a rather important element of the system. If there is a need to increase the thrust in the channel, which is part of the furnaces and boilers, then the described design is absolutely indispensable. An effective device designed to improve the functioning of the heater is permissible not only to produce, but also to be installed in the future without the help of professionals. It is important to remember the prohibitions, and also that, not having enough experience, it is preferable to purchase the described device in the store of the corresponding goods.