Today, ventilation corrugations are gradually replacing smooth rigid pipes. This is due to the mass of positive qualities of such products. However, for ventilation to fulfill the functions assigned to it, the corrugation should be correctly selected. It is necessary to pay attention to some parameters of such a product. How to choose the corrugation for arranging the hood will be discussed in detail below.
Features of the corrugation
Ventilation corrugation is a channel made of different materials. It incorporates rigid rings. They are covered in basic material. This allows you to fold the pipe in the form of an accordion. If necessary, the size of such a product is increased by stretching. In this case, the length increases significantly.
The inner walls of the pipe are smooth. This is a mandatory requirement for such ducts. It is extremely important to choose the diameter of the pipe. System performance depends on this. For this, they are guided by generally accepted norms. If the diameter and other parameters of the pipe are selected correctly, excessive moisture will not accumulate in the room, and fungus will not appear. Extraneous odors, dust, etc. will also be emitted.
Corrugation bends at different angles. Its installation for this reason does not cause difficulties. Even a master without experience will cope with this task. However, it is extremely important to consider the basic requirements for conducting this process. Otherwise, the operation of the system will not be efficient and safe.
On sale are many options for corrugated channels to create ventilation. They differ in material, resistance to adverse environmental influences, throughput.
Cross Section Size, Length
The diameter of the corrugated pipe affects the efficiency of the entire ventilation system. The larger the room, the more powerful the hood is installed in it, the larger the size of the cross section of the channel should be. He will be able to let a certain amount of air per unit time.
In everyday life, the minimum diameter of the ventilation corrugation is 100 mm. This type of pipe is suitable for a small room (for example, a standard kitchen in Khrushchev). The larger the room, the wider the channel must be mounted in the system. For domestic use, the maximum diameter has a corrugation vent 250 mm. Channels from 300 mm and more are suitable for industrial premises, catering establishments, etc.
Most often, the choice of diameter is made in accordance with the parameters of forced drawing. She has an outlet of a certain diameter. It is calculated in accordance with the performance, capacity of the equipment. It is necessary to choose a corrugation of the same diameter. If there is no such channel size on sale, you can purchase a product with a slightly larger cross-sectional size. In this case, it is pressed tightly onto the nozzle with a clamp.
In no case should you install a smaller duct. This will negatively affect the operation of the equipment. It will not cope with the duties assigned to it and will quickly fail.
Wanting to calculate the diameter of the duct yourself, you will need to take into account a number of parameters. You need to know the size of the room, the air velocity in the system, as well as the air renewal per unit time (m³ / h).
Duct price
The cost of corrugated pipes is relatively low. This is the main reason for the popularity of the presented type of ducts. Prices for corrugated channels are an order of magnitude lower than for similar rigid types of pipes. At the same time, you can now buy similar products in almost any specialized store.
The price of corrugated channels depends on the material of manufacture and the diameter of the pipe. Almost always, for domestic use, aluminum ducts are chosen. They are practical, durable and easy to install. Their length is usually 3 m. This is a generally accepted standard. If necessary, you can reduce the length by cutting off excess with a knife.
The minimum cost of corrugated channels for removing humid air from a room is 200-210 rubles. This is an aluminum duct with a diameter of 100 (110) mm. It is used for a 5-6 m² kitchen with a low-power range hood.
A corrugation ventilating 125 mm costs a little more. You can buy a similar duct at a price of 230 rubles. The price may be higher if there are certain improvements in the design. So, channels with reinforced metal rings are somewhat more expensive. In this case, the minimum cost is 270 rubles. This is largely influenced by the pricing policy of the store, as well as the pipe manufacturer.
150 mm ventilation corrugation is sold at a price of 350 rubles. Ducts with a cross section of 200 mm can be purchased for 380-400 rubles.
At their low cost, the presented products are also distinguished by low costs for related materials. For them, you do not need to additionally purchase adapters, corners. The duct is flexible. Therefore, only clamps are needed to fix it.
Diameter calculation
When choosing a ventilation corrugation from 100 to 200 mm, a simple calculation should be made. In this case, it will be possible to choose an air duct in accordance with the characteristics of the room and the conditions of its operation.
It is necessary to determine the total area of the room in which it is planned to create ventilation. Next, determine how many people live in the house. This is necessary to determine the rate of air exchange. There are certain sanitary standards that determine the rate of renewal of indoor air masses.
So, for each person, an air exchange of 60 m³ / h is required. If two people live in the house, the indicator, respectively, is 120 m³ / h. Next, you need to use a simple formula:
ST = B * 3600 / C, where ST is the cross section of the duct pipe, B is the air exchange in the room, and C is the air velocity inside the system.
To perform the calculation, you need to look at the manufacturer's instructions for the hood. The instructions indicate how fast air moves in the system. Then it will be possible to say what kind of ventilation corrugation (120, 110, 200 mm) is required for a particular room.
Material selection
Ventilation corrugation 200, 150, 110 mm or other sizes can be made of different materials. Most often, the presented ducts are made of special plastic or aluminum. Both types of materials have their advantages and disadvantages.
The most reliable material for the production of corrugated channels is aluminum. It does not deform under the influence of temperature and humidity. Aluminum is a non-combustible material. It does not melt. At the same time, with increasing temperature, aluminum does not emit harmful, toxic substances. The ventilation channel of this type can be operated at a temperature of + 250º ... -30º.
Aluminum is not afraid of chemicals. Therefore, its life is long. At the same time, a corrugated pipe made of this material has high aerodynamic qualities. The air inside such a channel moves quieter. Therefore, there is no need to purchase an additional special box with sound insulation. It also reduces installation costs.
Ventilation corrugation. the plastic pipe looks neater. Such channels are made of special heat-resistant PVC. Plastic is not subject to corrosion, has a low weight. It does not absorb moisture at all. However, the disadvantage of plastic channels is their increased noise level. Also, aluminum is less susceptible to mechanical stress. Therefore, the channels of this material are acquired in the vast majority of cases.
Benefits
By choosing the correct diameters of the ventilation corrugation, you can ensure the correct functioning of the system. It is also important to mount the system in accordance with existing regulations. In this case, the corrugated channel will perform the functions assigned to it. He has a lot of positive qualities. Among them are:
- Ease of installation. The pipe can be bent at different angles.
- The length is simply shortened with ordinary scissors or a knife. No special tools are required for this.
- The length of the channel can vary from 1 m to 3 m. To do this, you just need to stretch it. Even if the master made mistakes when calculating the ventilation route, he can easily compensate for them.
- On sale is a huge selection of corrugated pipes. Their diameter can be selected exactly with the operational characteristics of the system.
- Light weight. Both aluminum and plastic channels weigh a little. It also simplifies installation.
- No need to install additional adapters. Only a few clamps are needed to fix.
- The cost of corrugated ducts is negligible.
- The service life is long. Materials that are approved by the standards for the manufacture of ventilation ducts are resistant to adverse effects. Therefore, they do not collapse for a long time.
The listed reasons explain the popularity of corrugated pipes for ventilation. However, before buying it is worth considering the negative qualities of the products presented.
disadvantages
Any ventilation corrugation (100 mm, 125 mm, 200 mm, etc.) made of aluminum or plastic has certain disadvantages. You should find out about them before buying.
Pipes are quickly covered with dirt and soot from the outside. It is rather difficult to wash the ribbed surface that air ducts have. The dirt remains in bumps. If you exert physical efforts in order to wipe off a sticky coating, you can damage the channel. It can be deformed. Also, its tightness may be impaired. Because of this, the entire exhaust system will not be able to fulfill the functions assigned to it.
If you stretched the pipe, it will be problematic to assemble it in its previous position. In this case, any mechanical manipulation can lead to damage to the channel. Work with such material carefully. Kinks and dents are especially dangerous. They affect the aerodynamics of the pipe.
The air velocity inside the corrugated channel is less than in a smooth and rigid pipe. Therefore, in terms of performance, the varieties presented are inferior. They can be used for rooms of small and medium size.
Mounting Features
Ventilation corrugation for hood is mounted in accordance with the established rules. First you need to prepare a sketch on which the size (scale) and the position of the channel in the room will be indicated. Also, the dimensions and configuration of the room should be indicated on the drawing. You should think in advance about the location of the ventilation duct, as well as all its elements.
You will need to purchase materials. The pipe is selected in accordance with the features of operation and system performance. Clamps required. With their help, pipes are fixed on the flanges. Also, such fasteners allow you to set the channel at the desired height.
Ventilation grilles will also be required. One of them must have a check valve in the design. It will not allow cold air to enter the room from the outside. This will reduce heat loss in the cold season. During operation, aluminum tape and sealant (sanitary silicone) may be required.
If the exhaust pipe is not round at the hood, you will need to purchase an appropriate adapter. Its cross-sectional area should be the same on both sides. Only the shape is different.
System installation
To mount the ventilation corrugation, you will need to perform a series of sequential steps. First, the channel is stretched to its full length. If necessary, cut off an extra piece of duct. The exhaust outlet is treated with sealant. On it you need to put on (fully) corrugated channel. Next, at the junction you need to put on a crimp clamp. It is tightened, ensuring the tightness of the joint.
Further, at a distance of not more than 1 m from each other, clamps with a dowel are installed. They will keep the duct in the correct position. In this case, the corrugated sleeve can be fixed on the wall or ceiling.
Next, the second end of the duct will need to be connected to the nozzle of the ventilation grill. The procedure is the same as for the exhaust outlet. The edge is treated with sealant, and then put on the corrugation on it. It is fixed with another crimp clamp. After that, the ventilation grill can be installed in the space provided for it. To do this, use screws or special glue.
Installation complete
The equipment is included in the network (after hardening of the sealant). Next, the system is checked for operability. A plain sheet of paper is brought to the hood of the hood. If he sticks to it, then everything is done correctly. Otherwise, you need to look for an error. The system is most likely leaky.
If desired, the channel can be hidden using a decorative box. However, if the track is laid on the surface of tall cabinets, this is not required.
Having considered the features, advantages and disadvantages of the ventilation corrugation, as well as the rules for its selection, you can purchase a suitable duct. Its installation is quite possible to do it yourself.