Home Article How to insert the chimney into the hood

How to insert the chimney into the hood

Exhaust ducting: easy to install and user friendly

Corrugated pipes are quite popular, and the sphere of their use is quite wide. Most often they are used to connect hoods with the ventilation system. The positive qualities are due to the high performance characteristics, and the main advantage is the ease of installation. Bellows for the hood can serve for the arrangement of chimneys or the installation of air ducts. About its types, characteristics, features of installation will tell this article.

The scope of application of corrugated pipes is quite extensive

What is a corrugated pipe for the hood: features of construction

The corrugator has gained its popularity because of its high efficiency as a connector between the ventilation duct and the ventilated device. It is characterized by ease of installation, which can be carried out even by an inexperienced technician without special tools. The required size and shape can be easily created due to the flexible nature of the corrugated pipe.

Corrugated pipe serves to connect the ventilation duct with the hood

Corrugated pipe for ventilation has a fairly simple structure: it consists of metal rings, which are covered with a thin layer of insulating material. Most often this wrapping is made of several layers of laminated foil. Pipe in most cases has a cylindrical shape. There are types of the product, where strips of the basic material are simply twisted in a spiral. Depending on the type of model the thickness of the strips may be 100, 120, 150 ml. They are securely connected to each other by special locking seams, forming an airtight bond.

By compressing the links, the flexible outer layer is folded into an “accordion”, and by stretching them, the pipe can increase several times. Softness of the frame allows not only to stretch the design, but also bend it at the desired angle. A long pipe can be given a serpentine shape, which makes it possible to use it in the most inaccessible places. Corrugated. the ideal option for inconvenient placement of the ventilation system or in a small-sized apartment.

The fundamental factors for the classification of corrugated pipe

Corrugated pipes are made of a variety of materials of different lengths, basic shape and diameter. Plastic pipes are available in different colors. The price range is also quite wide. These basic differences are the basis for the classification of corrugated. Product manufacturers offer a variety of models. from colored and thin transparent plastic to special stainless steel culverts. When choosing, it is necessary to be guided not only by external features, but also by the production characteristics and the purpose of the product.

The scope of application of the corrugated tube is very wide. Models with a large diameter (over 3.5 m) are laid under highways and under railroads, where they serve as reinforcing walls on culverts under embankments. Diametrically opposed thin models are used as insulation or to divert water. Such an example may be a corrugated tube for an air conditioner.

Corrugation can be made of a variety of materials, colors and diameters

Useful tip! Choosing a corrugation, you should pay attention not only to its color and harmony with the interior, but also to the appropriate type of pipe, which has a narrow purpose.

Structure and dimensions of metal, textile and plastic corrugated pipes

According to the external structure, the conduit can be in the form of a circle, rectangle or square. A variety of materials are used in the manufacture of corrugated pipes. Their list is very wide:

  • galvanized steel;
  • stainless steel;
  • Aluminum foil;
  • textile fiber
  • Polyethylene of varying degrees of pressure, HDPE;
  • polyvinylchloride fabric.

Each type deserves separate attention, since it is the structure of the material and size of the tube depends on its intended use. The most popular in this list is corrugated stainless steel or aluminum, which is most often used in the installation of home ventilation. Based on the method of production, corrugated pipes are divided into the following types:

Plastic corrugations are used both for hoods and plumbing fixtures

  • Frame. Represent a frame of metal, covered with foil or film. The flexibility of such ducts allows restoring the original, non-deformed look.
  • Spiral winding. Are in the form of metal strips with medium flexibility. The product can be stretched twice, but the original position after it will not return.

Polyethylene or plastic conduit is used in plumbing fixtures, for example, to supply water to various types of household appliances. In addition, the corrugation is widely used in the installation of sewage intra-apartment passages, in particular under the bathtub or sinks.

The scope of application corrugated tube: for ventilation, heating, chimney

Different materials from which the product and the size of the bellows indicate a wide range of its purpose in various areas. Thin small, but long plastic or plastic pipes are used in the installation of a variety of networks. These can be electrical, telephone, television wires, power and fiber-optic Internet cables. To isolate electrical wires use corrugated tube with a diameter of 15 to 40 mm.

Less flexible metal corrugated pipe used in heating systems, because such pipes are fast and easy to install. A piece of the right length is easy to bend in the right place without changing the diameter inside, which makes it possible to create a heating system in difficult and inaccessible areas.

Corrugated pipes of large diameter are used for arrangement of chimney ducts

For ventilation systems are suitable pipes that have great flexibility. Diameter corrugations for the hood correspond to the size of 10 to 15 cm. Sometimes these values are up to 20 or even more than 30 cm. These options. this is rather an exception, although in the commercial sector they can easily be found. As a material for making corrugations used in the kitchen ventilation system, the most common is aluminum foil. Less common in the home they are plastic or stainless steel pipes.

Textile ducts are used for the arrangement of communication systems in industrial premises, because they do not interfere with the free circulation of air. They are widely used in meat processing plants or in catering establishments.

What is a corrugated pipe?

Corrugation consists of metal rings wrapped in several layers of laminated foil. The links are pressed together, and the foil is folded “accordion”. Thanks to this design, the pipe can be stretched and made several times longer. Also corrugated installed on the hood, you can easily bend at any angle, as it has no rigid frame. If desired, the pipe can even be laid “in a snake”. Due to the plasticity of the product is a success when working in difficult and inaccessible places. Corrugation is suitable in cases where the installation of the hood is carried out in cramped conditions.

Varieties of corrugations

There are many variants of corrugated pipes. First of all, they are distinguished by the material from which they are made. In the ventilation system are most often used two varieties:

The former are used in the construction of air ducts, both in production and in standard kitchens. This is due to the fact that aluminum is a more reliable material. It does not catch fire or melt at high temperatures (operating range.30 to 250 °C), is very durable, does not react chemically, and has good aerodynamic properties.

Plastic corrugation looks neater (see. Photo) and attracts less attention, although both models can be easily hidden.

The advantages of plastic corrugated pipe also include:

The disadvantage of ribbed duct PVC is greater noise than aluminum.

Corrugated pipes for ventilation also vary in length and diameter. Here the choice depends on the characteristics of the place where the products will be installed.

Standard diameters used for the hood. 100, 120, 125, 150 mm. Other sizes are less common, so it is not difficult to find the right corrugation for the required conditions. To make sure you know the right diameter, look at the hood’s instructions, they always give you the right size. often used the size of hoses 100 and 120 mm.

Types of corrugated pipes for ventilation and their characteristics

Durability and efficiency of corrugation depends on the material of manufacture. There are three types: plastic, aluminum and steel.

Plastic chamfer for ventilation. the cheapest and most stylish pipe

Plastic models are made of PVC or polyethylene. These are the cheapest of the three types. Among the pluses are the availability of convenient connectors, a huge selection of size options, ease of installation, as well as light weight.

There are also disadvantages. Plastic chimneys for the hood is not recommended for use in case of high heat. In rare cases, they can melt.

Some types of plastic chutes have reinforcing ribs

Aluminum corrugated ducting. an option for aesthetes

In contrast to plastic structures, aluminum chamfer is not afraid of high temperatures, is not subject to corrosion.

Aluminum chamfer easily changes its shape, easy to install, does not require additional protection from overheating

Among the obvious disadvantages. some vibration and noise during operation.

Steel corrugated pipe for the hood: ideal, but not a budget option

Extraction cords for galvanized hoods are also available. These models are more durable, however, they are somewhat more expensive than aluminum constructions.

With these extraction ducts you can forget about your ventilation problems for a long time

How to choose the correct diameter and length of the pipe for the kitchen hood

The cross-section of the corrugation depends on the diameter of the hole of the ventilation shaft. Very often in the kit you can buy special grids. Pictured here is one possible variant.

Most often the diameter of the section of the corrugation is standard. 100, 120 or 150 mm

Advice! Every kitchen hood has instructions for use. Most of the time there are recommended sizes for your model.

Built-in extractor 60 cm in the cabinet: advantages and disadvantages, types, review of popular models (Krona, Bosch, Gefest, Elikor, Hansa, Kaiser), independent installation, tips. in our publication.

Technical characteristics of the corrugated pipe

The main technical characteristics of the corrugated duct used for the hood are its dimensions. it is the diameter and length. The length is determined by the manufacturer and can be standard size or sold in coils, allowing you to buy the duct required length.

Rectangular bellows are used in ventilation systems in enterprises and technical facilities

Corrugation can be rectangular or circular in shape. Rectangular models, as a rule, are used only in production facilities. The diameter of the manufactured ducts are standard: 10/12/12,5/15/20 cm, and 30 cm or more, but these dimensions are not related to the standard of such products. Plastic and aluminum, stainless and galvanized steel as well as textile and polyethylene are used for manufacturing corrugated ducts. By design, such products come in frame and spiral winding type.

What kinds of corrugated pipes are used for home hoods

When installing ventilation systems in the living space are used corrugated circular spiral coiled ducts made of plastic and aluminum, stainless steel and galvanized steel.

Corrugated aluminum pipe is lightweight and has a frame construction

Aluminum corrugated pipe

This type of corrugated pipe can be used for indoor installation and use outdoors. Characteristic features of this type are: low weight and medium rigidity frame. The advantages of aluminum corrugated ducting include long service life and the ability to use under different temperature regimes. The disadvantages are considered to be: an increased noise level arising in the inner space of the corrugator when the hood works at high speed, as well as the presence of vibration during use.

Plastic chamfer for ventilation

Plastic corrugated ducts are low cost and easy to install. In addition, the advantages of this type include: minimal resistance to the air flow created in the inner space of the pipe, as well as a variety of models that differ in technical characteristics.

Plastic corrugated pipe. a budget option when installing ventilation systems

The disadvantages of plastic corrugated pipe are:

  • flammability;
  • In a fire emits a significant amount of smoke, harmful to human health;
  • susceptibility to destruction under external mechanical influences (brittleness);
  • the presence of a specific odor that appears during operation, due to the increased temperature of the circulating air. for the cheapest models.

Plastic ducting for ventilation. In this publication we will consider the review and characteristics of plastic ducts, their pros and cons, the nuances of the device of ventilation from plastic.

Other types

Other types of corrugated pipes, used less frequently than the above are products made of stainless steel and galvanized steel.

Stainless steel ducts look good in the kitchen, decorated in high-tech style

The advantages of such materials are:

  • long service life;
  • strength and resistance to external mechanical influences;
  • non-combustibility;
  • absence of smell during use;
  • a pleasant appearance, and for the models of galvanized steel. a variety of colors and availability of coated models.

Among the disadvantages are high cost and complexity of installation work.

Kitchen hoods with exhaust to ventilation are considered more efficient, they make less noise and provide air exchange required by building regulations. How to choose them correctly and independently carry out the installation. read in the material.


How to install a corrugated hood in the kitchen by yourself and why? To ensure that the air is renewed regardless of whether the hood is on or off, it is worth connecting a corrugated pipe through the grille to the ventilation hole. Because the hole has a compartment for the air duct and for air removal. When installing it is also necessary to take into account the technical characteristics. the size and length of the pipe, otherwise all the work done will be impractical. Remember about the quality and reliability of the material. In addition, it is better when everything is done in the same style, according to the interior. It should be understood that the cost does not guarantee proper performance of the installation, so study the collation. There is also written how to install the ducting for the kitchen hood.

How to choose the size

It is necessary to measure the entire length with a tape measure. And consider the route the duct will take. For example, its possible path lies through the cabinet, along the walls or along the ceiling. After the calculations, it is worth adding about 10 to 15 percent more to the total length. This is an important point before you connect the chimney to the hood.

IMPORTANT! Specify the size of the corrugation in the stretched form. It is worth taking a length to spare. Ideally it is 3 meters, but even if you find yourself with an extra length, it does not hurt.

In the reverse situation, if there is a shortage of material, you can attach the missing piece with duct tape, but this option will reduce the permeability of the duct. Only resort to this in extreme cases. With the smallest number of corners, but with a larger degree, the hood is able to work much more smoothly.

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How to fix the hose to the hood

In order to somehow connect the corrugator to the hood, you will need:

corrugated tube self-tapping screws clamps for fixing the sleeve or soft wire grid under the ventilation or adapter silicone sealant adapters if you could not find a corrugated tube of the appropriate size

How to attach the corrugation to the hood, after all the tools are ready:

Before working, you should clean the ventilation in the apartment To begin with, stretch the corrugation along its length, check the components. Avoid kinks so the air draught remains good. Using sealant, lubricate the neck of the hood Put on the corrugation and secure it with a clamp, but if it is not available, then wrap the wire. It is necessary to lay so to the end of the vent hole Fix the grating under the vent with self-tapping screws After that put on the shroud with sealant Secure the work with a clamp Check the exhaust system by connecting the hood to the mains. This is done as follows: turn on the hood at maximum power, now take a sheet of paper and bring it to the bottom of the grille. A sign of proper installation is holding the sheet. it means that the air is sucked in. That’s it, the problem of how to put a corrugator on the hood, solved.

TIP! Do not wipe the exterior surface, this will save you from extraneous unwanted odors.

It is necessary to know that the ventilation hole is mandatory. You don’t want to cover the sump completely.

If you do not want the chimney to be in public view, it is possible to hide it. How to insert the duct inside the hood so that it is inconspicuous? This can easily be done with cabinet doors, a decorative box or other elements. To disguise it, you need to choose a color to match the furniture. To make it harmonious, try to design everything based on the style of the kitchen. Another option is to install an overlay. It can be shaped along the contour of the cabinet, thereby providing discreet ventilation. It will also not be difficult to lay inside the kitchen garnish. However, by doing so, a lot of necessary space will be lost and holes will be added, which will need to be cut through.

If you do not want to understand how to attach the bellows to the hood, you can simply order a professional installation. Especially if the kitchen was made together with a custom hood. Then, the installation of corrugated hoods may not go according to the standard scheme.

Why is it necessary to install corrugated ducting on the hood

The use of corrugated pipes is good because they have many advantages. For example, most can afford to install them, and installation, as it turns out, is quite simple. In addition, have a wide range of types and sizes and low weight in a compressed state. High temperature resistance, so they do not catch fire. It is possible to install both indoors and outdoors, which indicates the functionality. Placed in different planes, used in different parts of systems. It is only necessary to take care once and the freshness in the room is guaranteed for a long time.

Hood varieties. can you do without corrugations?

On today’s market a huge variety of hoods, they differ not only in the widest range of design: from robust classics to futuristic high-tech, but also the power, which makes sense to properly select, depending on the area or even the volume of the kitchen. If a low-power device quite cope with its task in the kitchen in “hruschevka”, then buy the same for a modern apartment-studio. a waste of money. Unwanted odors and soot will be provided.

Kitchen “rescuers” are also fundamentally different in principle. There are two: there are flow-through hoods and there are circulating hoods. About the flow-through we will talk a little later, first we will touch on the circulating. They are relatively simple to handle. This is an autonomous device, which, in fact, “drives” the air in the room in a circle, purifying it through its internal filter. It is enough to choose a hood that suits the style, connect it to the network and use it. However, experts point out the significant disadvantages of this type:

High maintenance requirements. the hood and filter must be cleaned often; as the filter gets clogged, the hood doesn’t perform as well as it should; Not suitable for larger rooms.

The main advantage is one. there is no notorious tube of corrugated aluminum foil, which overshadows the joy of a carefully calibrated kitchen design. A flow-through hood is just what you need, because as it sucks air in, it takes it out into the ventilation, making cleaning more efficient.

Installation Instructions

Stretch the corrugation to its maximum length. Slide the duct onto the exhaust outlet of the exhaust unit and secure with a clamp. If the distance to the ventilation hole is large, every meter and a half additional secure the duct clamps to prevent swinging during the system. Hang a grille with a flange and a non-return valve on the vent. Insert the corrugation into the flange, securely fix the connection with a clamp.

If you want to buy a corrugated hood, then once again reread our material and study the pros and cons. Choose a solution that will keep you out of trouble in the kitchen for as long as possible.


Air ducts used for kitchen hoods, vary in material, shape and level of rigidity.

Exhaust ducts are made of several types of plastic:

For connection to the exhaust device in the kitchen, the first 3 types are suitable: they are resistant to high temperatures.

Products for kitchen hoods can be corrugated (flexible), as in the following photo, or made of rigid smooth plastic.

Divided ducts with rectangular or circular cross section.

  • Rectangular plastic ducts are compact, easy to hide under the suspended ceiling, more convenient in terms of installation.
  • Round exhaust ducts have a higher capacity and a lower noise level.

Design features and dimensions

Remember that when buying ducts made of PVC, you must have adapters to connect the plastic pipe and hood. Also adapters are used for duct bends and connections to the general ventilation. If you use a corrugated product for the hood, you can save on adapters to bend the pipe.

Important! PVC pipe lengths must not exceed 3 meters. Otherwise, the performance of the hood will fall with each additional meter.

Any bending also has a negative impact on the functionality of the hood. When installing the duct in the kitchen, try to avoid angles of 90 degrees. This will cause overloading of the hood, which will significantly reduce the service life of the product.

It is allowed to make not more than 3 elbows and bends.

Diameter of the plastic pipe chosen by the cross section of the ventilation hole. Dimensions of rectangular and square PVC kitchen ducts are standard. Most often the following values are used: 110 × 55, 120 × 60 and 204 × 60 mm. Round plastic pipe sizes range from 110 mm to 150 mm in diameter.

Buy these products can be found in almost every construction store. It is worth noting that the price of flexible ducts is slightly higher than that of flat PVC ducts.

The most important rules for the installation of a hood sleeve

Even inexperienced construction workers can cope with the work on the installation of the chimney on the hood. There are a number of nuances to be aware of:

  • The more bends the duct has, the greater the load on the exhaust motor and the lower the efficiency of the entire system. Ideally, the number of bends should not exceed three.
  • It is desirable to lay the chimney so as to avoid angles of 90 degrees (or allow them as little as possible).
  • It is always necessary to use the pipe corresponding to the diameter of the outlet of the hood. Reducing the diameter will increase the load on the motor and reduce the efficiency of the device.
  • When buying corrugated pipe is better to take a small margin of error in the bends and turns. But too long corrugation should not be installed either. Ideally, the hose should be fully extended, because otherwise its ribbing increases. This increases the rate of fouling, reduces the flow rate and makes it harder to clean.
  • Ideally the length of the duct should not exceed 3 meters. The longer the duct, the lower the efficiency of the hood (the harder it is to run the air to the vent).
  • If the length of the pipe is not enough, it is possible to attach the missing piece with aluminum adhesive tape. Each additional connection impairs the permeability of the duct, so it is advisable not to use this method unnecessarily.
  • Connect the duct to the ventilation hole is better through the grid, which has a separate hole for the duct, and separately. holes for natural removal of air. This way the air in the kitchen will be renewed regardless of whether the hood is on or off.

What will be needed for installation?

To install the corrugated pipe on the kitchen hood will need:

  • Corrugated tube of the required diameter and length;
  • Clamps to fix the sleeve on the flanges of the hood and grill;
  • A grille with a non-return valve for the vent;
  • aluminium adhesive tape;
  • silicone sealant.

Grid for the connection of the socket and the holes

If you can not find a suitable bellows configuration (for example, the outlet of the hood is round and the pipe is square, or different in diameter), you also need the appropriate adapters.

How to install the hood socket?

To properly perform the installation, you must follow all the rules and follow the steps in strict sequence.

  • To begin with, the corrugated hose must be stretched along its entire length. If the hose is long, it must be trimmed with conventional scissors.
  • Next, you must smear the outlet pipe hood sealant and connect to it one end of the bellows. It is necessary to put on the corrugated tube completely to the edge of the outlet spigot.
  • If the cross section of the corrugated tube does not match the cross section of the outlet pipe, you must first install an adapter to the hood, and already to it mount the corrugated pipe.
  • Now you need to fix the sleeve on the branch pipe. To do this, put on a clamp and clamp it.
  • Then put clamps on the pipe every 1-1,2 meters. They allow you to attach the sleeve to the walls or ceiling.
  • After laying the duct along the chosen path, you can proceed to the final step. connection to the outlet grille. It is necessary to put a silicone on a pipe of a ventilating grid and to connect to it the second edge of a corrugated pipe.

The installation of the ventilation duct is complete. Now you can make the connection of the hood itself to the network, and proceed to test its performance:

  • Take a sheet of paper;
  • turn on the hood at full power;
  • Hold the sheet of paper up to the filter grid at the bottom of the cooker hood (this is where the air is going to be sucked in).

If the paper is sticking to the grill, it means that everything is installed correctly and airtight.

SIEMENS Hood LC91KWP60I ⚡90 Cms ⚡Inclined chimney ⚡IQ Drive Motor 45 Db ⚡

How to hide the chimney from the hood?

The hood works, but the corrugation spoils the whole look of the kitchen? You don’t know how to keep this mess out of sight? Consider a few answers to the question of how to hide the corrugation:

  • You can disguise the corrugated pipe with a plastic box (available at building material stores). You can also install a box of plasterboard, which is more complicated and longer.
  • You can hide the duct by laying it inside the kitchen cabinets.
  • If there is a gap between the cabinets and the ceiling, the hose can be laid over the cabinets under the wall. Then it will not be visible from the floor.
  • Another way to cover the corrugated pipe is to install plasterboard or stretch ceilings, and let the duct over the structure. This method is optimal in terms of aesthetics, but not practical: to replace or clean the ductwork without dismantling the ceiling will not be possible.

Routing corrugated pipe in drywall ducting

It is desirable to cover the corrugated hoses so that they can be easily removed if necessary (for cleaning or replacement).

When to replace or clean, and how to do it?

There is one unpleasant thing: in the folds of the corrugations willingly accumulate dust, dirt, grease, soot, and it is very difficult to clean it.

Over several years of regular operation, quite a thick fouling accumulates on the inner walls of the duct, which is almost impossible to clean. Since it costs quite cheap and easy to install corrugated pipe. it is easier and better to replace the dirty section.

To remove the corrugated tube, you need to unscrew the clamps and remove the hose from the exhaust pipe and ventilation grille. Then you need to clean the joints from the sealant and clean the ventilation grid (you can also replace it if you want).

Then you need to buy new corrugated pipes and follow all the steps for installation as described above.


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Duct installation

Modern modular kitchen systems allow you to compose a set so that the cooktop is under the exhaust duct in apartment buildings. Mount the system of vapor-gas mixture extraction above the furnace to the wall. The exhaust outlet of any system is fitted with a removable non-return valve. It is a flap that prevents ingress of extraneous gases from the general ventilation duct. To this ring by means of clamps the corrugation is fastened.

The second end is led into the air box through the grille with a hole equal to the diameter of the corrugation. However, there are cases where the holes are not aligned. Then you should buy a plastic adapter, with which to fit the output. To narrow the nominal passage in this case experts do not advise more than 20%. Failure to do so will make the hood too noisy and cause the fan motor to overheat.

Hood efficiency also depends on the straightness of the ducting. Each bend increases flow resistance and reduces performance. Therefore the shorter and straighter section of the chimney, the more effective the hood.

If the system is installed independent and the suction is led out through the wall or roof overlap, you should perform a series of measures to protect against ingress from the outside. For example, an opening in the open air must be protected from the wind, which may blow into the pipe and the hood will not overcome its resistance. In addition, a protective casing will save from precipitation and accidental ingress of birds. The system led out to the attic must have a grid against penetration of rodents.

Extraction can generate more noise and move the ducts when the hood is in operation. In order to eliminate vibration, it must be rigidly fixed to the structures. Maybe by attaching it to the wall with duct tape. With an increase in noise, inspect the system for clogged ducts and clean them. At the same time to carry out an inspection of the technical condition of the fan. Determine the presence of backlash and bearing operation.

Pipes for ventilation: selection features for exhaust and ventilation systems

A normal kitchen hood is a forced exhaust ventilation system, which is almost identical to the ventilation. But it is worth noting the difference from the general ventilation inside the apartments. In high-rise apartments, the fact that the general exchange ventilation with natural inducement functions without the use of a fan. In addition, this type of system serves to carry out air exchange throughout the room, and the function of the hood involves the removal of contaminated air in a particular place and at a particular time.

Air ducting is very important in the kitchen. Modern general ventilation does not eliminate products of combustion and evaporation of moisture from the stove, but provides air exchange throughout the apartment. This situation does not suit everyone, because everyone wants the repair to last as long as possible, that it is not often needed to carry out general cleaning with thorough washing of walls, ceiling and furniture.

Fume extraction ducts must be of good quality and be of the right size

Therefore, over time, began to produce local ventilation devices that are installed above the stove. exhaust hoods. The kitchen duct serves to remove contaminated air outside the room. This is the main function of the ducts.

Like any appliance, the duct has its pros and cons. The main advantage is the ability to effectively remove carbon dioxide, moisture and soot. Disadvantages of exhaust pipes:

  • take up a lot of space;
  • Do not fit well into the kitchen interior;
  • The work of the fan creates additional noise, especially if its installation was carried out incorrectly;
  • require regular cleaning of the outside, and sometimes the inside of the product.

Installing an extractor hood in the kitchen: can we do without it

It is not always possible to install an extractor hood in the kitchen. There are cases when its installation is prohibited by the rules for the operation of gas appliances. For example, if the room is equipped with a gas water heater, the so-called gas water heater, or a gas boiler for heating with an open combustion chamber, it is contraindicated to install a circulating hood.

In most cases it is not possible to do without an exhaust hood

Useful tip! Removal of decomposition products from the boiler is not forced, and during the inclusion of a fan on the hood can cause the draft to tip over, resulting in the release of toxic products of combustion into the apartment. Therefore, installation of a flow-through hood is permitted only if the boiler is equipped with a closed combustion chamber, i.e. with a coaxial type chimney and air intake for combustion from the outside. It is possible to install a circulating exhaust hood with filters, which clean the air from grease and cinders.

So before you make a kitchen hood, you need to figure out if you can do without a duct. If it is still needed, then you must determine the type of device. Exhaust hoods can be flow-through or circulating. Devices of the flowing type exhaust the exhaust air from the kitchen, and the circulating ones simply clean the air without its elimination.

Circulation devices are installed above the stove, the air passes through special charcoal filters, there is also cleared of grease. No ducting is needed for these constructions, they are compact and easy to install. The main disadvantages of ductless hoods are the need for frequent filter replacement, incomplete air purification, and lack of moisture and carbon dioxide removal.

Ducting for a kitchen hood

One of the stages of the hood installation is the selection and installation of air ducts. The air is extracted from the kitchen at room temperature, so there are no special requirements to the ducts and you can use any duct. Usually three types are used:

  • Aluminium corrugated hose. It is good that it is easy to give the desired shape. it easily bends at any angle. Simply take a piece of the desired length and give it the desired shape. Disadvantage: the operation of the hood will be noisy, as the air flow causes noise and resonance. The second negative point. the surface is ribbed, which creates additional difficulties for air flow. Well, one more disadvantage. it is hard to maintain: soot and dust get stuck in the grooves, it is hard to clean.
  • Plastic (PVC) round ducting. Convenient in operation round polymeric pipes. The duct of the desired configuration is collected from the shaped elements. roundings, bends, adapters, couplings. They are connected to the pipe due to the presence of expansions on the shaped elements. To during the operation of the elements did not separate, the joints can be smeared with glue (liquid nails or Moment). Another option is to fasten with self-tapping screws. three or four pieces per connection. The advantage of PVC ducts for the hood. they are “quiet”, the smooth inner walls do not create obstacles to the movement of air, the outer is easy to clean. The disadvantage. more complicated assembly process (compared to the aluminum corrugation).

There is also a difference between plastic and corrugated ducting. price. Polymer ones are more expensive. Despite this, if you have the opportunity to install a hood using PVC, put them. With an equal cross-section, they provide a more efficient air extraction, as well as less noise.

The cross-section of the ducting is determined by the size of the outlet on the hood. In the case of rectangular ducts use an adapter.

Duct sizes for hoods

Round ducts are available in three sizes: 100 mm, 125 mm and 150 mm. This is the diameter of plastic pipes and corrugated hoses. There are more cross-sections of flat ducts and they are shown in the table.

Dimensions of flat PVC ducts for hoods

How to choose the size? In the case of round pipes, their diameter must match the diameter of the exhaust outlet. It is very undesirable to put an adapter at the outlet and then use a smaller diameter duct. this will reduce the rate of air purification. And even if the hood is very powerful, it will not be able to purify the air.

With the selection of a rectangular duct. its cross-sectional area must not be less than the cross-sectional area of the outlet spigot. And the connection is made through a suitable adapter.

How to attach the conduit to the hood and ventilation

If you decide to install a hood and use aluminum corrugated ducting, you will need to think about how to attach it to the body and to the ventilation. To do this you will need clamps of the right size. They can be metal or plastic.

To connect the hood to the ventilation system you will also need a special ventilation grille. It has a hole at the top to connect the duct pipe. The lower part has holes for removing air from the kitchen by means of natural circulation when the hood is not working.

For fixing the corrugation is suitable grille with a protrusion. around the hole there is a rim of a few centimeters, on which the corrugation is put, then it is fixed with a clamp of the right size.

Use the same principle of attaching the pleated duct to the hood. There is a ledge on it, on which a corrugation is put. The connection is tightened using a clamp.

How to attach the duct to the wall

For plastic ducts, there are special fasteners in the form of clips. They are first mounted on the wall with wall plugs. Installation pitch depends on the curvature of the route but on average 1 fixing per 50-60 cm is sufficient. You insert the ducts with a slight force into these clips during installation.

If the duct is to be fastened to the ceiling, the same brackets can be used. But if you need to maintain a certain distance from the ceiling, this type of installation is not suitable. In such cases, they take peorized hangers for plasterboard, fasten them to the ceiling, then to them with small screws PVC duct for the hood.

Corrugated ducts are attached to the walls with clamps or large plastic tighteners. If necessary, they can also be mounted to the ceiling using peorized aluminum hangers.

Where and how to bring the duct out

Most often the duct from the hood in the kitchen connected to the ventilation hole through which the natural ventilation (due to the draft). This is incorrect because in this case a large part of the grille is closed by the duct, and through the remaining available openings air exchange will be clearly insufficient.

A large part of the ventilation grille is closed and the ventilation in the apartment will be insufficient

The correct way to connect the duct is in a separate air duct. In this case, a grid like the one in the photo above is mounted on the hole.

If there is no separate ventilation duct but there is an outside wall nearby, you can take the pipe outside by placing a grille. These are two ways to have normal ventilation and ensure proper functioning of the hood.

How to get it outdoors

To install the hood and flue ducting into the wall, you must make a hole in the wall. And that’s the only difficulty. Then a duct is inserted into this hole and sealed with mortar. Outside the hole is closed by the lattice. to prevent debris, birds and small animals do not settle.

One example of an extractor hood in the kitchen with air ducting through the wall

To the room is not blown into the air from the street, install a check valve (in the figure above it is marked oblique line). It is advisable to put it when connecting the duct to the ventilation system so that smells from pipes didn’t get into the room.

This is what a non-return valve for the air ducts looks like

A non-return or anti-return air vent is a lightweight plastic or metal plate. It is fixed movably in two places to the chimney at the top and bottom. While the hood is not running, the valve closes off the air from the outside. When the hood is turned on, the air flow deflects the plate forward, pushing back the spring. Once the cooker hood is switched off, the flap springs back into place. If you install a hood without this valve, it can be too cold in the kitchen in winter. outside air will have no problem entering the room.

So that the hood does not interfere with the natural ventilation in the kitchen

By the way, with a T-piece and a non-return valve you can install the hood so that it does not interfere with the natural ventilation in the kitchen. You will need a special ventilation grille for connecting hoods, non-return valve and T-piece. To the ventreschette is fastened T-branch, to its lower input is connected to the air duct from the hood, and on the free exit is placed a check valve, but only in such a way that the lobes were locked when passing air from the pipe (in the photo below).

Anti-return valve for normal natural ventilation in the kitchen

How does such a system work? When the hood is off, non-return valve blades are bent, the air from the kitchen into the vent duct through the grille and the open output of the tee. When the hood is turned on, the airflow from the hood reverses the valve plate and the air goes into the ventilation system. When the hood is turned off, the springs reopen the airflow through the tee.

Externally, such a system does not look very attractive and it must somehow be masked. But this is the only way to connect the hood to the only existing ventilation outlet and not reduce air exchange.



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