The creation of a system that delivers fresh air to the room and ensures that the spent mass is brought out is one of the means to fulfill the requirements of sanitary and hygienic standards. In modern construction, for buildings of complex configuration, aluminum corrugated pipes for ventilation are most often used for this purpose. They can be found in residential buildings and industrial buildings. Agriculture is no exception.
Corrugated pipes are used for ventilation of premises for various purposes
Content
The advantages of aluminum products
Such widespread use of these products is due to the fact that the designs created on their basis are characterized by the unique properties listed below.
- high corrosion resistance. In the body of the aluminum pipeline, the corrosion process is excluded;
- when installing the system, you can not use expensive bends, but only couplings. This property is ensured by the ability of the corrugated aluminum pipe for ventilation to bend in any necessary direction;
- even a small corrugated pipe can create a very long section of the ventilation pipe;
- due to the acceptable strength, it is allowed to mount the pipe on a supporting plane without using a power frame. As a rule, fastening is performed using a conventional collapsible clamp on one self-tapping screw;
- ease of installation. This property is due not only to the low weight of aluminum, but also to a simplified docking process;
- when installing an aluminum corrugated pipe for ventilation, it is not necessary to ground it;
- resistance to aggressive environment.
In addition, the flexible pipe allows the home foreman to independently mount the ventilation system of any configuration without violating the integrity of the pipeline.
Helpful information! The use of a round corrugated pipe is allowed in combination with a rectangular duct. Modern industry produces for this special adapters from one section to another.
An important role in the high demand for aluminum corrugated pipe for hoods is played by its aesthetic appearance. Such a duct can be recommended for installation in kitchens, drying and ironing rooms without the need for additional decoration.
Aluminum corrugation bends easily and it is very easy to fix it
Production and application features
The raw material in the manufacturing process of these products is aluminum roll foil. First, a strip with a width of 50 mm and a thickness of 0.1 mm from a roll is fed into the rolling block of a special machine. On this equipment, ribs with triple locks located at the edges are rolled in the center of the strips. The next step is to wrap the foil around the profile gauge. As a result, reliable lock fastening is obtained at the edges. The production of corrugated pipes for ventilation is being completed by rolling the semi-finished product through the rollers. This technical solution allows the duct to bend at the required angle, as well as expand and contract in the longitudinal direction.This method is focused on the manufacture of both flexible and semi-rigid corrugated pipes with a diameter in the range from 80 to 310 millimeters.
The latest technologies allow the production of aluminum corrugations flexible and semi-rigid for hoods with a bend smaller than one fourth in diameter. These products demonstrate their high performance over the years, withstanding multiple significant pressure drops, without losing an attractive appearance and strength.
The following accessories are now available for corrugated pipes: protection devices that prevent the ingress of debris of building origin, connecting smooth-walled pipes with flexible pipes and connecting flexible pipes. The ability of aluminum corrugation to stretch three ˗ four times provides an opportunity to save on fittings. If necessary, pipe extension can be performed using metal tape.
When mounting an aluminum corrugated pipe, the use of metal tape is allowed
But they can not always be used in ventilation systems. For example, you cannot install ducts from an aluminum corrugated pipe on boilers, fireplaces and stoves that run on solid fuel, because it is not able to withstand high temperatures. For gas columns, the use of air ducts of this type is also not recommended.
Mounting a semi-rigid aluminum duct
To install a ventilation structure made of corrugated aluminum, you must perform the following steps:
- one end of the pipe is put on the coupling;
- two clamps are laid on top;
- the end of the second pipe is inserted into the other end of the coupling;
- the connection point is tightened with clamp screws.
Pgood advice! It should also be noted that aluminum has a high thermal conductivity. Therefore, the ventilation system during the heating period can act as a “cold bridge”. The accumulation of condensate will lead to a deterioration in the microclimate in the room. To avoid this phenomenon, the aluminum corrugated pipe for drawing needs to be additionally thermally insulated.
The above-described installation method due to the high ductility of aluminum allows you to form a fairly tight connection. However, masters of household chores often use a different, less time-consuming and cheaper technique without a clutch. For its implementation, they acquire corrugated pipes of different diameters. Further, everything is very simple: a smaller one is inserted into a large one to a depth of 50 centimeters. But here, to ensure the reliability of the joint, screw clamps are used.
Fix the pipe to the wall with a plastic sleeve
Features of the selection of the duct for the hood in the kitchen
Since most volatile compounds that require withdrawal from the living space are formed in the kitchen, this issue is especially relevant.
As you know, air ducts can be not only round, but also rectangular. What are their operational differences? This will be discussed below.
- According to generally accepted standards, the length of the ventilation pipe must not exceed 3 meters. To a greater extent this applies to the corrugated duct. Exceeding will cause a sharp decrease in efficiency. So, the level of efficiency loss for each subsequent linear meter of length can reach 10 percent;
- during the design of the ventilation system it is necessary to be guided by the principle of minimizing the number of turns. Of course, they cannot be avoided. But you should be aware that any subsequent change in the flow of air mass is another loss of 10 percent efficiency. And turns at an acute angle are generally unacceptable;
- even if you prefer a rectangular duct, it is not out of place to listen to the opinion of specialists. The capacity of the corrugated ventilation pipe with the same cross-sectional area will be higher than that of a rectangular pipe.This is due to the fact that the turbulence of the air mass flow in it is created naturally;
- the cross-sectional area of any section of the duct should not be less than the value of the same parameter of the pipe located at the outlet of the cooker hood. Even a local narrowing of the channel will cause an overload of the electric drive, lead to an excessive consumption of electricity, and can even result in failure of the ventilation equipment. In addition, passing through narrowed areas, the air often creates unpleasant noises;
Having preferred the rectangular duct, be prepared for the fact that you have to stock up on adapters. This is due to the fact that most ventilation grilles and hoods have cylindrical pipes.
An important role in the installation of ventilation is played by the diameter of the corrugated pipe
The main thing is to prevent the choice of pipes from the point of view of their throughput. For this, it is necessary to compare the cross-sectional area of products of different shapes. From the school course of mathematics it is known that the value of this parameter of the round duct is S = πr2 where r is the radius of the circle.
The cross-sectional area of a rectangular pipe is determined by the following formula:
S = H × L, where H and L are the lengths of the sides of the rectangle.
Helpful information! The performance of the hood will not win at all with a significant increase in the cross-section of the duct relative to the nozzles of the hood equipment and the ventilation duct. They will “take in” no more than their cross sections allow. Thus, such a measure will bring nothing but an increase in the cost of the structure and its weight.
It should be noted that modern air ducts can be equipped with a check valve that blocks the penetration of air from the outside, but does not impede the forced removal of fumes from the stove.
Aluminum corrugations for hoods are supplied to the consumer market with diameters of 80 ... 315 millimeters. Actually, this parameter is the main factor that directly affects the cost of the final product. Monitoring of this segment of the domestic market provides the following data: price stainless corrugations 7 ˗ 8 times the cost of aluminum corrugated pipe for ventilation. Therefore, if the expected duct temperature does not exceed 250 ° C and the presence of increased strength characteristics is not required, an aluminum corrugated pipe is the most economical solution.
