Solving the issue with the assignment of exhaust gases from such a flow heater, like a gas column, it is necessary to correctly pick up the air duct for this equipment and know the nuances of its installation. The main purpose of the air duct is to bring the combustion products from the column to the street - through the hole in the wall or through the chimney mine.
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Air ducts for gas columns are classified for several features:
- According to the manufacturing material, the air duct is steel or aluminum. Made of aluminum foil corrugated air duct is a cheap and accessible option, but it is not recommended for the use of the column, since it quickly goes.
- Depending on where combustion products are removed, the air duct can be chimney (it is connected to the ventilation well) or coaxial (it is removed through the wall of the house).
Steel air duct
Aluminum duct
Materials
Stainless steel
For the manufacture of such steel air ducts use high-quality steel. It is often covered by a special enamel of white color with heat-resistant properties. They differ in a smooth surface, which positively affects the aerodynamic resistance. Such ducts are less polluted and minimally noisy during the operating column.Stainless steel ducts
Of steel
Quite often, steel ducts are galvanized pipes. They differ slight weight, high reliability and minimum noise while using equipment. The disadvantage of such pipes is the risk of icing in the winter, therefore, in case of installation of such an air duct outside the building, take care of the insulation of the pipe.
Steel chimney
Why enamel pipes for air ducts are gaining popularity?
The steel pipe on which the protective enamel coating applied from above is more protected from external influence. First of all, the enamel prevents the formation of rust on the surface of the duct. In addition, such an enamelled pipe is characterized by high heat resistance (it easily endures the temperature drop), resistance to chemical exposure to acids or alkalis, as well as significant mechanical strength. In addition, the different color of enamel makes such an air duct attractive outwardly.
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Steel enameled air duct
Design
The most optimal form for the gas column duct is round. It is with this form that the effectiveness of the branch of combustion products will be the best. If the form of the duct is square, it will affect the efficiency ratio.
The duct should not be excessive length, since the bends of the ventilation pipe reduce performance. In this case, the bends of more than 90 degrees adversely affect the thrust. The optimal is considered the length of the air duct to three meters.
With each additional meter of chimney, the drawing performance will decrease by 5-10%.
How to choose a diameter?
It is important to ensure that the diameter of the air duct has not been less than the diameter of the column outlet. The standard parameters are called 11 and 13 cm. To determine which diameter is needed in a particular case, the capacity of the equipment and the number of waterproof points take into account. If the column works with a capacity of up to 20 kW and at the same time water enters to one point, a pipe with a diameter of 110 mm is needed. For greater power and the need for servicing several points, an air duct with a diameter of 130 mm is required.
Installation
Installation work will depend on the selected duct.
- If you stopped on a steel pipe, then you need to buy the necessary adapters. To find out how the length of the pipe is required, measure the distance from the column to the opening of the ventilation channel. Installation of the pipe and adapters is quite lightweight and reminds the assembly of the designer. To secure the duct and processing its connections, use the sealant.
- If you decide to use a corrugated air duct, you do not need any adapters. Corrugation is stretched to the required length to connect the ventilation system and column. If you want to add length, it is used for this metallic scotch.
In order for the gas column effectively worked, it is necessary to correctly calculate the height of the chimney. How to do it correctly can be viewed in the following video.
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