Pipes for Hoods. Nuances of Choice and Installation Features

Pipes for Hoods. Nuances of Choice and Installation Features

The key to a beautiful and comfortable kitchen is its impeccable cleanliness. Regular cleaning and clean air are veray important. Ordinary ventilation is not enough here, since during cooking, moisture and combustion elements are released, which settle on the walls, ceiling, floor and furniture. To a large extent, a ventilation hood will help to solve this problem. This device requires proper installation, especially at the junction with the ventilation duct. Correctly selecting the pipe for hood, it will significantly increase the efficiency of ventilation.

Any residential building should be equipped with a hood. This is the most important condition not only for a comfortable, but also for safe living, since people themselves breathe carbon dioxide and moisture when breathing. In addition, decay products such as soot, grease, gases, and moisture appear during cooking.

The use of ventilation pipes

As a result, moisture settles on furniture and walls, forming mold, fumes and soot, which pollute the surfaces, and combustion elements, such as carbon dioxide, lead to fatigue, irritability of the respiratory system, poor health and poor performance. Carcinogens released by frying can cause poisoning. That is why the installation of the hood is important, the efficiency of which is significantly affected by correctly selected pipes.

Duct evolution and development

In high-rise buildings the apartments had a small area. Ventilation in such rooms took not only harmful substances from the kitchen and bathroom, but also the air from the living rooms. Ventilation ducts were then apartments directly into the walls of buildings. In the houses of individual buildings, ventilation was not provided at all, and the ordinary chimney built into the home stove saved the inhabitants from the harmful effects of carbon dioxide. The products of fuel combustion and decay elements formed during cooking disappeared there.

Helpful advice! Before purchasing an exhaust hood and ventilation pipes, it is necessary to study the ventilation or exhaust system itself, which is provided for by the building structure. This is an important point contributing to the effectiveness of indoor air cleaning.

Duct evolution and development

Fresh air came into the old houses and apartments mainly through loose doors and windows, and soot and soot accumulated gradually on the walls and ceiling, so whitewashing was required every year. In individual apartments, ventilation ducts were provided – prototypes of cooker hoods, the same ventilation was installed in the bathrooms and toilets.

In modern apartments, in addition to the hood, an additional ventilation system is installed. It can be exhaust and supply and exhaust. In energy-efficient houses, the installation of a supply and exhaust system with heat recovery is a prerequisite.

Depending on the material of manufacture, there may be aluminum, plastic pipes for ventilation, as well as those made of galvanized steel.

The shape of the duct distinguishes square, rectangular or round pipes. Given the degree of flexibility, two types of products are distinguished – flexible and rigid boxes. Flexible ducts are usually made of corrugated aluminum or galvanized steel. Now rigid pipes made of metal are not used, since their installation is quite complicated, as well as the manufacturing process itself. Such pipes should have a diameter of 100-150 mm. Aluminum products are much more expensive, although they do not have special qualities and advantages. Therefore, they are not used when installing a kitchen hood.

Plastic ducts have a round, square or rectangular shape. Their surface can be either rough or smooth. Most often they are white, although they are often painted in other colors, which makes it possible to choose a plastic duct for the kitchen hood, which harmoniously fits into the interior.

We will talk more about each specific type of ducts below, list their advantages and disadvantages, and also dwell on the features of installation.

Features of choice for exhaust and ventilation systems

A conventional cooker hood is a forced draft ventilation system that is almost identical to ventilation. But it is worth noting the difference from the general exchange of intra-apartment ventilation. It consists in the fact that in multi-storey buildings, general ventilation with natural motivation operates without a fan. In addition, a system of this type serves to provide air exchange throughout the room, and the exhaust function involves the removal of contaminated air in a specific place and at a specific time.

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

Therefore, over time, they began to produce local ventilation devices that are installed above the stoves – hoods. The pipe for the kitchen serves to remove polluted air outside the premises. This is the main function of the ducts.

Like any device, 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:

  • occupy a large space;
  • do not fit well into the kitchen interior;
  • fan operation creates additional noise, especially if its installation was not carried out correctly;
  • regular cleaning is required outside and sometimes inside the product.

Installing the hood in the kitchen, is it possible to do without it

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

Helpful advice! The removal of decay products from the boiler occurs without coercion, and during the inclusion of the fan on the hood, draft may tilt over, which will lead to the emission of poisonous combustion products into the apartment. Therefore, the installation of a flow-through exhaust device is allowed only if the boiler is installed with a closed firebox, that is, with a coaxial type chimney and air intake for combustion from the street. It is possible to install a circulation hood with filters that purify the air of fat and burning.

Therefore, before you make the hood in the kitchen, you need to figure out whether it is possible to do without an air duct. If you still need it, then you should determine the type of device. Hoods can be flowing or circulating. Flow-type devices draw exhaust air from the kitchen, while circulation devices simply purify the air without eliminating it.

Circulation devices are installed above the stove, air passes through special charcoal filters, and fat is also cleaned there. Air ducts are not required for such designs; they are compact and easy to install. The main disadvantages of a hood without a duct are the need to often change filters, incomplete air cleaning, and the lack of moisture and carbon dioxide removal.

Ventilation duct classification

The modern market offers a wide selection of ventilation systems and accessories for them, necessary for installation. In this case, there is a certain classification of ducts. Pipes for hoods in a private house or apartment, designed for household ventilation, are conditionally divided into the following groups:

  • Depending on the material of manufacture, there may be aluminum, plastic pipes for ventilation, as well as those made of galvanized steel.
  • The shape of the duct distinguishes square, rectangular or round pipes.
  • Given the degree of flexibility, two types of products are distinguished – flexible and rigid boxes.

Ventilation duct classification

Flexible ducts are usually made of corrugated aluminum or galvanized steel. Now rigid pipes made of metal are not used, since their installation is quite complicated, as well as the manufacturing process itself. Such pipes should have a diameter of 100-150 mm. Aluminum products are much more expensive, although they do not have special qualities and advantages. Therefore, they are not used when installing a kitchen hood.

Flexible ducts

Plastic ducts have a round, square or rectangular shape. Their surface can be either rough or smooth. Most often they are white, although they are often painted in other colors, which makes it possible to choose a plastic duct for the kitchen hood, which harmoniously fits into the interior.

We will talk more about each specific type of ducts below, list their advantages and disadvantages, and also dwell on the features of installation.

Helpful advice! Plastic ventilation pipes are considered the most practical, since due to the smooth surface they are easy to wash, and much less grease and soot is collected inside. The smoothness of the walls also helps to reduce air resistance, resulting in reduced vibration and noise.

Materials for the manufacture of ventilation plastic pipes

Plastic pipes for hoods can be made of different types of material, the main ones are as follows:

  • polyvinyl chloride;
  • polyurethane;
  • polypropylene;
  • polyethylene.

The most practical and common are PVC pipes. Among the pluses should be highlighted lightness, reasonable price, ease of installation. In addition, they provide good strength and tightness of the plastic duct for hoods.

At the same time, it is worth noting certain limitations in the use of these pipes. In particular, their use at temperatures above 120 ° C is not allowed, since when heated, toxic chlorine is released, which can cause irreparable harm to health. Pipes of this type can be installed in the kitchen, bathroom and toilet, but they are not allowed to be installed in rooms with elevated temperatures, for example, in a sauna or in a room with a fireplace.

At temperatures below 5 ° C, the effectiveness of the pipes is lost, polyvinyl chloride becomes more fragile, so this material is not suitable for installation in rooms that are designed for seasonal residence.

Polypropylene is an excellent dielectric, has low hygroscopicity and high resistance to aggressive chemical environments. A plastic duct made of polypropylene is about 4 times stronger than high pressure polyethylene pipes. However, it can be used at a temperature that does not exceed 90 ° C, with the exception of the fire-resistant model with flame retardant additives – PPS.

Polyurethane is close in properties to PVC pipes, but is able to withstand higher temperatures – up to 280 ° C. The most durable material for the manufacture of plastic pipes is vinyl urethane, which is reinforced with a steel spiral. It should be noted that with proper operation, plastic pipes will last more than 10 years.

Metal ducts and corrugations for hoods

Among the metal pipes for hoods, the most popular are aluminum corrugations for round ventilation. They are practical and easy to install, as they can take almost any form. For installation, no turning parts are needed, just bend the pipe. In addition, aluminum ducts are durable.

The main disadvantage is that because of the corrugated surface it is problematic to remove the settled fat and soot from them. In addition, the corrugation creates a certain resistance to air, which leads to the formation of additional noise.

Corrugation hoods can be made of galvanized steel. These pipes are characterized by rigidity and strength, as well as ease of installation (like corrugation made of aluminum), but stiffness complicates the process a bit. At the same time, it should be noted that in places where zinc spraying is damaged, the pipe corrodes.

Helpful advice! Corrugation made of aluminum is considered more plastic, since it can be easily bent, stretched or squeezed. It is this type of duct that is recommended for use in places with bends and drops.

Aluminum and galvanized metal ducts have common advantages:

  • no additional adapters and corners are needed for installation;
  • smooth bends rather than sharp turns increase ventilation efficiency;
  • the ability to stretch and contract greatly simplifies the installation process;
  • low cost.

Tips and tricks for choosing a pipe for hoods

Choosing pipes for the duct, most consumers are primarily guided by aesthetic considerations, which is justified. Therefore, before buying, it is recommended to determine how the box will be mounted: outside or behind furniture, behind a false wall or above a suspended ceiling.

A shiny corrugated pipe definitely spoils the interior of the kitchen, so if it comes to an open arrangement, then most often choose smooth plastic pipes that can be painted in a color that matches the design of the ceiling or walls. The most beautiful fit into the open interior is a rectangular or square pipe for the kitchen. A round hood is a less aesthetic option, but it creates minimal resistance to air flow, minimizing noise.

If we are talking about a hidden way of laying, it is better to give preference to a corrugated metal pipe. It is much easier to mount because it does not require the use of adapters and angles. If it is necessary to overcome an obstacle on the way to the ventilation duct, it is enough to bend such a pipe. However, masking corrugated products will require additional costs. In addition, if access to the duct is required, then the entire conspiracy will have to be dismantled.

Shapes and sizes of ventilation pipes, selection rules

Shapes and sizes of ventilation pipes

The diameter of the round ventilation pipes should correspond to the cross section of the outlet pipe on the kitchen hood. It should be remembered that it is round boxes that create minimal resistance to air flow. As for the shape, the straight pipe is optimal, but sharp corners are not allowed during the installation of air ducts.

The ideal duct length should be no more than 3 m. If this figure is higher, then the fan must be at maximum power. The diameters of the corrugation, which is used in household ventilation, are 10, 12.5 and 15 cm.

The standard sizes of plastic pipes for ventilation of square and rectangular shape are as follows: 8 × 8, 10 × 10, 12.5 × 12.5, 5.5 × 11, 5 × 12, 6 × 20.4 and 9 × 22 cm. Diameter plastic pipes can be 10, 12.5, 15 and 20 cm.

Helpful advice! When choosing between plastic and metal products, it is better to give preference to a duct for drawing into the kitchen from plastic. Such pipes have a lower resistance to air flow, they are easier to wash, and they fit into the interior much more organically. If concealed ventilation duct laying or operation at high temperatures is expected, flexible pipes are recommended.

How to calculate the minimum dimensions of a plastic pipe

How to calculate the minimum dimensions of a plastic pipe

The cross-section of square and rectangular plastic ventilation pipes should be equal to the cross-sectional area of ​​the round exhaust pipe. If the diameter is narrowed, the system will deteriorate, the fan will be overloaded, and the noise will increase. As a result, vibration will occur and the mounts will weaken. The minimum section size is allowed only when a powerful fan is installed in the hood, but it is not used to the maximum.

It is best to take a pipe whose cross section is slightly larger than the diameter of the pipe. If the diameter of the pipe significantly exceeds the cross-sectional area of ​​the nozzle, this will entail additional costs and problems with masking it.

It is not necessary to calculate the size of the cross section of the hood duct. It should be equal to the diameter of the outlet pipe. If the hood has a certain power reserve, but it is not used at full power, then the cross section can be slightly narrowed. Calculate its minimum value will help the formula:

Smin = Sp * (Qp * Qmax), where:

Smin is the minimum cross section indicator;
Sp – the section of the pipe indicated in the product passport;
Qр is the volume of air to be removed;
Qmax – the maximum indicator of the volume of air to be removed, it is indicated in the exhaust passport.

Qр is calculated according to another formula: Qр = Vkitchen * 12 * 1.3 m³. Vkitchen is the area of ​​a room. According to sanitary standards, 12 is an indicator of air exchange, that is, the air in the kitchen should change 12 times per hour. 1.3 is the coefficient of power loss in the duct and ventilation shaft.

How to properly install the hood in the kitchen for all types of pipes

How to properly install the hood in the kitchen for all types of pipes

First of all, it is necessary to ensure thorough sealing of joints at all possible places of connection of the pipe and transitional parts. At the same time, the number of adapters should be minimal, as well as the number of turns and narrowings. All these factors entail a decrease in the efficiency of the hood.

The box must have a reliable mount to the wall and ceiling. For this purpose, special clamps are used. If the duct is movable, then vibration will occur in the system, which will lead to an increase in the noise level and a violation of sealing.

In order to learn how to properly install the hood, you should first study the rules for installing the duct, that is, laying the pipe from the hood to the opening of the ventilation shaft. To do this, select the shortest path. In the case when the length of the structure exceeds 3 m, it is worth considering another option for air venting, for example, directly to the street.

The system itself should consist of a minimum number of turns, since each turn of the box by 90 ° reduces the efficiency of the hood by about 10%. Such losses can be avoided by organizing a smooth rotation of the pipe using two 135 ° bends or elbows with different angles.

Important! In no case should you allow the box to rotate at an acute angle – such an incorrect step will lead to a complete stop of air movement in the pipeline.

In the event that the duct length is excessively long, it is better to resort to the help of specialists who will help calculate the estimated power losses in the pipe and the required fan power.

How to lay a plastic ventilation duct with your own hands

lay a plastic ventilation duct with your own hands

The process of installing air exhaust pipes from the hood to the ventilation duct is a simple task, so it can be done independently without any experience. To do this, just follow the tips below. First you need to prepare tools and materials, among which should be:

  • box;
  • corners, adapters of a certain section;
  • bends;
  • return valve;
  • grid for connecting ducts to the ventilation shaft;
  • drill;
  • hacksaw;
  • Bulgarian;
  • screwdriver;
  • sealant.

In order to install the duct for the kitchen hood indoors, you should carefully measure the full route of air passage. The grate located at the entrance to the mine needs to be dismantled. The channel itself needs to be cleaned of dust, burning and cobwebs. After mounting the hood, it is necessary to connect the duct to the pipe of the exhaust equipment. In this case, all joints should be lubricated with sealant. In this case, a heat-resistant agent is not needed, since the temperature of the air that is discharged is small.

Next, make a sequential installation of the system. To do this, insert one element in turn into another, and the pipes are shortened to the required size, cutting off the remains with a grinder or hacksaw. Then the box is fixed to the wall using special mounts or clamps. The distance between them should not exceed 500 mm.

The grate is mounted on the wall of the shaft with dowels. A grill with a hole for the pipe and for natural ventilation is considered more practical. The system should also be equipped with a non-return valve, which will prevent air from entering the ventilation shaft back into the room if the hood fails.

System testing, pipe insulation and masking of hoods

The system must be tested before use. If leaks are found, the defective areas are lubricated with sealant. In case of rattling in places of contact of the duct with other structures, a gasket made of expanded polystyrene or foam polyethylene should be placed.

If the system is installed in the attic, it is necessary to warm the ventilation pipe. It is also necessary to exclude the possibility of water entering the duct, as this will lead to a quick failure of the fan. Thermal insulation will help to avoid such consequences. For this purpose, it is sufficient to use slabs of foamed polyurethane foam or mineral wool. The insulation layer should be covered with roofing material or fiberglass, fixing everything with wire.

Helpful advice! For efficient installation of the duct, it is necessary to use pipes, adapters and adapters for drawing only industrial production. The modern market offers a wide selection of these products for both round hoods and square and rectangular ducts.

In order to mask the duct, you can use different methods:

  • decorative screen;
  • simulated kitchen hanging cabinet;
  • stitching the structure into a suspended ceiling;
  • painting or decorating pipes to match the walls and ceiling;
  • installation of decorative boxes.

System testing

Disguising with a screen that simulates a wall is the most popular and budget option. To do this, you can use simple drywall. In the case of mounting boxes behind a false wall or under a false ceiling, it is necessary to take into account the fact that in the future it will be problematic to disassemble the structure.

How to make a hood in the kitchen without a duct and other ways of organizing the duct

A special category is made up of circulation hoods. They are more compact and easy to install, since they do not require duct installation. A cooker hood without pipes is simply fixed on the wall or fixed to the ceiling if the stove is located in the middle of the kitchen.

In addition to the traditional method of venting the duct into the ventilation duct, as well as installing hoods without pipes, there are other options for venting air. You can simultaneously connect one or two points of air exhaust to the channel or simply take the pipe to the street. Whatever method you choose, the main thing is that general ventilation is installed in the kitchen.

install the hood in the kitchen

If you plan to install one point of the fence, then when connected to the ventilation system should remain the possibility of functioning of natural ventilation. If the kitchen has two ventilation ducts, it is necessary to connect the hood to one of them, and leave the passage for natural air exchange in the other shaft.

When there is one shaft, a tee is mounted at the inlet of the exhaust pipe to the ventilation shaft with the option of switching between a forced exhaust system and natural ventilation. If you need to connect two air intakes to one vent system at once, then check valves must be installed between the tee and the fans. Otherwise, the fans will simply interfere with each other.

In the efficiency of the ventilation system in the kitchen, a significant role is played by the hood itself, methods of air exhaust, as well as the duct. When choosing pipes for hoods, it is necessary to take into account the material of manufacture, their shape and size of the ventilation duct. If everything is selected correctly, then, following the tips given in the article, you can easily connect the hood in the kitchen yourself.

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