Chimney cap is a simple product, and you can easily make it yourself. In our article, we will describe in detail how to choose the right chimney cap or make it yourself.
Below we will consider in detail the main functions of hoods for chimneys :
It is worth noting that decorative caps do not improve the draft of a brick chimney; rather, on the contrary, they create significant resistance to the flow of generated gases. In this case, nozzles of the following types will be an exception:
In the first type , the air flow from the wind washes the cylindrical casing of the aerodynamic device, due to which a slight vacuum appears inside.
And the deflector umbrella increases thrust, but in the absence of wind currents it is likely to create even higher resistance escaping gases.
The second type is much better. The body with the vane petal rotates on the pipe thanks to the bearing. And the petal maintains the position of the body constantly turned towards the wind.
As a result, a vacuum appears inside the half-cylinder, and the thrust increases significantly. This cap also protects it from overturning the draft when the wind blows.
The hoods on the chimney pipe are different devices that cover the cut of a brick pipe with a certain gap for gas outlet. The range of chimneys is so diverse that there is simply no way to list them all.
But the materials from which the caps are made, we give below:
A simple homemade chimney cap is usually made of galvanized steel.
This is an affordable and common option, and the product will last a long time.
There is only one minus - the galvanized metal will quickly darken, and as a result, the cap will not look very nice over time. Metal with a special powder coating is devoid of this minus, but the cost of this material is significantly higher.
Other materials retain their appearance for a very long time, and their service life is not limited.
Only their cost can be considered a significant drawback.
It's worth noting that outdoor copper will tarnish over time.
Selecting a hood, first of all, it will depend on the type of boiler plant and the type of fuel burned. Hoods on a brick chimney serving gas heating can only be installed in the form of a nozzle, and always with an open top.
In the Russian Federation, according to regulatory documents, it is forbidden to install all kinds of umbrellas on the chimneys of gas-using installations.
It is quite simple to explain this prohibition . At sub-zero temperatures, the chimney cap freezes and becomes covered with a layer of ice. As a result, a crust of ice covers a significant part of the working opening, dramatically reducing traction. Due to this, the waste will go inside the house, and this is a serious danger to people's lives.
Ice is formed as a result of condensation that forms on cold metal when it comes into contact with exhaust gases and at low temperatures.
Smoke from gas boiler houses
installations has this temperature. That is why it is forbidden to install hoods on brick chimney pipes. If the boiler is solid fuel, then its efficiency is within 70-80%, and the gas temperature varies from 100 to 200 ºС. Under such conditions, you can choose a suitable cap, but during operation it will quickly become covered with soot.
Having solved the issue with the boiler plant, let's move on to the exhaust pipe.
If the chimney is assembled from a three-layer sandwich, then it does not need protection from rain. Sediments falling into the canal wash the pipe from the inside, and the water is discharged into a special condensate collector. For gas boilers, a nozzle is suitable, for solid fuel boilers - any other nozzle.
If there is a brick pipe in the house that serves a solid fuel boiler, then the dimensions of the cap for the chimney pipe can be chosen from any and from any material.
In the case of gas heating, an umbrella must not be placed on the chimney.
Since moisture entering the pipe destroys the material over time.
If you have certain locksmith skills , the chimney cap is not difficult to make. On the Internet, you can find a variety of drawings of caps. We recommend that you stick to the simple four-pitched mushroom version of the umbrella. The first thing to do is a drawing of a hood for the chimney pipe.
The second is the removal of the dimensions of the chimney cap in place. The resulting results must be entered on the sketch.
After all the detailed calculations of the hood, proceed to the preparatory work. The pattern must be cut out of cardboard and better in full size. Next, attach it to a sheet of metal, circle and start trimming.
Do-it-yourself chimney cap is best made of galvanized steel or metal with a special paint.
Then proceed to the following steps:
It is much more convenient to buy a ready-made cap or order it in the workshop. Today, hardware stores offer a wide selection of umbrellas and weather vanes. But the manufacture of a cap for a chimney pipe from galvanized steel is not at all a difficult job.
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