The design of the chimney depends on the type of boiler in the heating system. Requirements for the device discharged smoke are indicated in the instructions for each specific boiler, but there are also common construction and fire rates for chimneys.
Smoke geometry
It is important to choose the correct chimney diameter, which depends on the power of the boiler. If the power is less than 3.5 kW, the pipe diameter is at least 80 mm; If the power is from 3.5 to 5.2 kW - at least 95 mm, with a power of more than 5.2 kW - at least 110 mm. If the pipe diameter is a significantly larger boiler exhaust pipe, the thrust will decrease, and the boiler will work with interruptions. The distance from the outlet flange of the boiler to the chimney is at least 5 m, and the construction should be at least 0.5 m above the roof. It is necessary to ensure verticality and straightness of the structure. The inner surface must be smooth, then the soot will not accumulate. It is not recommended to narrow or expand certain sequid sections.
Brick chimney
Chimney of bricks build only for solid fuel boilers. For construction use a full-length ceramic brick. Build construction materials with ordinary cement mortar. The chimney is hard, so it is built for it a separate foundation or installed on a solid concrete overlap. Work is better to entrust the experienced Monto-a Pechnik. The channel size must be a multiple brick size (1/2 × 1/2 brick, 1/2 × 3/4, etc.). Wall thickness - not less than 120 mm. A good thrust is created in the device if the gases do not cool down. Therefore, brick chimneys are insulated with mineral wool. The pipe is designed for gases with a temperature of 600-650 degrees, but can withstand the temperature in the fire of soot reaching 1000 degrees. Brick chimney is designed for high temperatures of output gases. At temperatures of smoke up to 450 degrees, which is formed after the combustion of fuel in gas, liquid fuel and pallet boilers, water pairs on the chimney are condensed on the walls of the chimney, and it will always be wet. In addition, in the exhaust gases, a lot of sulfur forming a sulfuric acid with water that corps the design.
Ceramic systems
Used with gas boilers. Designed for the removal of combustion products with temperatures of not more than 450 degrees. Equipped with condensate removal system. Ceramics absorbs moisture, to dry out the walls from the outside should be ventilated. Collected from individual parts 600-1000 mm long. Elements are connected using the shaped elements and adhesive mastic. Typically, there are emptiness in the walls where ceramic pipes are installed. A more practical option is a ceramic tube in a steel case. Such chimney is light, does not require the foundation and special channels in the walls, it can be fixed anywhere inside and outside the house.
Steel chimneys
Can be used for gas and solid fuel boilers. The main advantage of the design is the speed of assembly, one part is simply inserted into the other. They do not require special channels and durable grounds. Move from heat-resistant steel. Single pipes are used together with brick chimney - the sections are simply inserted from above. A more complex - double-wall sandwich tube. The design is one pipe inserted into another. The space between them is filled with thermal insulation. A simple connection allows you to mount the design anywhere. For boilers with a closed combustion chamber, the chimney is even more difficult. In the two-dimensional device, the exhaust gases are discharged along the inner tube, and the combustion air is supplied by the gap between the pipes.
Calculate the chimney and perform installation works can be independently, it is enough to have construction skills. However, you may not know all the existing rules and norms, and work will have to redo. Therefore, in order not to overpay, contact a specialized company collecting chimneys constantly.
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