How to cut pvc pipes for hoods. Basic elements of the ventilation system

Plastic ventilation pipes for hoods: types, their characteristics, application

The organization of effective ventilation in the house is not a whim of the owner, but a necessity dictated by sanitary standards. For the device of such a system, plastic ventilation pipes for hoods are increasingly chosen, as the simplest, most productive and relatively inexpensive option.

The article we have presented is devoted to the installation of air ducts from plastic ventilation parts. We will tell you how to choose the components for assembling the system and how to make it flawless. Here you will find out what devices should be equipped with ventilation for stable operation.

Advantages and types of plastic pipes

These light products, in addition to ease of installation, are distinguished by a lot of other advantages: environmental friendliness, resistance to the negative effects of ultraviolet radiation, durability, small specific gravity, high resistance to aggressive environment, large size row and relatively low cost.

The disadvantage is a low threshold of temperature stability, which does not allow them to use them in industrial conditions. For a private house, they are ideal.

Plastic ventilation pipes. Now the most popular option used in the organization of exhaust ventilation at objects of various purposes

For the assembly and installation of the ventilation system, a wide range of elements is released, which allows organizing ventilation of any level of complexity

Components for organizing a ventilation system are made from reinforced plastic. The material is durable, resistant to chemical and biological aggression

Plastic pipes are excellently in contact with all types of building materials and finishes, do not harm wooden furniture, products and structures made of wood-cutting stove, OSP, GVL, etc.D.

Plastic products for the construction of ventilation systems are produced for the arrangement of private, public and industrial buildings

In the shape of the section, plastic ventilation pipes are divided into round and rectangular. In round, aerodynamic resistance is less, the rectangular ones look better

According to textured indicators, the pipes for ventilation are divided into hard and flexible. The duct from a flexible corrugation is easier and faster to build. In addition, the corrugation allows you to easily perform a turn without loss in the section

With light plastic pipes, ventilation is easier and easier to arrange, you can assemble it without problems with your own hands

In the construction market there are products of different lengths and diameter. There is a limit on the length for the pipeline from the PVC. 3 m minimum and 12 m maximum. Their diameter fluctuates in the range from 1.6 to 160 cm. For the cottage the optimal cross.section of the exhaust pipe 15 x 15 cm.

It is important that the inner surface of the PVC pipes is treated with antistatic, which is why dust almost does not settle in them, which extends the frequency of air duct service.

By type of section, 2 types of plastic pipes are distinguished:

Circular pipes also include corrugated varieties, with which it is convenient, quickly and efficiently performed by the turns of the air ducts.

The plastic pipe will fit perfectly into any interior. It can be adapted to the features of the building, giving it the necessary shape

From the point of view of aesthetics, a rectangular cross section is preferable, but when the room has a small area, a pipe with a cross.section of a circle, t, is more suitable.to. In this case, there are no protruding parts.

The marking available on a square pipe makes it possible to navigate relative to the correspondence of a rectangular cross section similar to a similar round air channel.

In a suburban house with a gas heating through an exhaust pipe that goes through the roof, the boiler combustion products are removed. The main enemy of the structure is condensation that appears when the temperature in the autumn-winter period is reduced.

He does not destroy the plastic pipe itself. However, moisture flowing along its walls can cause significant harm to the building, so the plastic duct at the output is necessarily insulated.

Plastic pipes are contraindicated for hoods arranged in baths and saunas, for chimneys and fireplaces, solid fuel boilers. If you still use them in these places, then pipe pipes from this material is necessary only from the outside. In this case, they will have to be well isolated from the cold.

Details about the choice of pipes for hoods made of polymeric materials are set out in the article recommended by us.

The use of ventilation pipes in everyday life

Ventilation pipes with a set of connecting and fasteners are called air ducts. They are designed to ensure air circulation and are installed in those rooms where there is no access to the natural air movement or there is an additional need to ventilate: in kitchens, in bathrooms, toilets.

Prior to the appearance of plastic parts on the market, the ducts were made of galvanized metal, they are now often found in production workshops or in catering establishments (their use is associated with high temperatures).

The construction of air ducts from plastic pipes allows you to get rid of all the disadvantages of metal structures

For the installation of ventilation ducts, a full.fledged toilet of products is produced, which provides the opportunity to assemble a system of any degree of complexity

Ventilation systems collected from plastic are resistant to chemical, biological, mechanical influences

Plastic ventilation systems do not rust or oxidize in wet rooms, mold and fungus do not settle on their walls

The minus of the air ducts made of polyvinyl chloride is that they are not recommended to be located next to the heating equipment and install in areas where the direct effect of sunlight is likely

Polymer pipes are characterized by high aerodynamic resistance, used in the device of both natural and forced ventilation systems

Plastic parts for the construction of air ducts in priority in enterprises, if a qualitative removal of an aggressive environment is required

Polymer elements are great for ventilation device in apartments and private houses due to lightness, strength, service life of 50 years

But for use in everyday life, that is, for installing ventilation in apartments and cottages, polymer products are more suitable.

They have the following advantages:

• have less weight than metal, so it is easier to install them with their own hands;
• smooth walls have a minimum resistance for air movement;
• they are sealed because they have no seams;
• resistant to high humidity, do not rust;
• On sale you can always find a set of fittings suitable in the section.

Products that meet GOSTs and have certificates of conformity are allowed for sale, so we can talk about the safety of plastic elements.

Stand in a supermarket with plastic elements of the assembly of the ventilation system for hoods: rectangular and round section pipes, adapters, tees, plugs, corner details

The main characteristics of plastic parts

Pipe properties need to know in order to correctly design and install the ventilation system in an apartment or house. The characteristics of the elements may differ depending on the installation site (above the ceiling made of drywall, in the cabinet, in the attic) and on the geometry of the room.

Consider what features become decisive when choosing.

Material material of air ducts

On sale you can find products to create ventilation structures of four types of material, which in everyday life is usually called plastic:

Polyvinyl chloride. Light, inexpensive, easy.to.install air ducts PVC are the most common material for the construction of household ventilation structures. They are strong, hermetic, but have some restrictions.

They cannot be heated to 160 ° C, as it begins to stand out harmful to all living chlorine, and according to the standards, the upper heating bar without risk to human health is 120 ° C.

PVC pipes are suitable for installation in the kitchen or in the bathroom, their use is prohibited where there is a possibility of heating to 160-180 ° C-for example, in saunas or in rooms with a fireplace

When a temperature decreases below 5 ° C, PVC becomes brittle, so to install a ventilation system in rooms with temporary accommodation, it is better to choose another type of pipes, for example, polyethylene or vinyuretane.

Polypropylene is a wonderful dielectric, not hygroscopic, has high resistance to aggressive chemicals. The strength limit is about 4 times higher than a similar indicator of high.pressure polyethylene products.

The main disadvantage is combustibility, the maximum possible temperature is 85ºС. However, there is a fire.resistant variety with antipyren additives. PPS.

Polyuretan in its characteristics resembles PVC, but withstands higher temperatures. up to 280ºС.

Viniuretan reinforced with steel spiral is considered especially strong. It is suitable for hoods, as it has excellent resistance to mechanical damage and flexibility that allows you to expand the duct at any angle

PND. low pressure polyethylene. It does not crack over time and, unlike PVC, it easier to tolerates negative temperatures (relevant for houses with temporary residence). Possible heat resistance. up to 80ºС, cooling. before.50ºС. Easy to process, like all types of plastic products.

Polypropylene and polyethylene pipes for household ventilation are rarely used, their PVC products lead.

From polypropylene sewer pipes, you can build a fan riser with a laying of the main pipe highway on the street

From the opening with an angular fitting, the opening is made and mounts for a fan pipe are installed from an angular fitting

Further actions consist in the installation of a pipe, the elements of which are connected using silicone sealant

Types of pipes by degree of flexibility

There are two categories of ventilation plastic pipes for hoods. hard and flexible. Sometimes a combined version is needed, but much less often. If the hood is installed next to the ventilation hole, there is no need for a complex design.

When buying hard pipes of round or rectangular section, it is necessary to purchase a set of additional details in order to arrange turns or place of transitions.

For assembly of a short duct for an extract located above the kitchen cabinet, rectangular PVC channels and connecting angular elements of similar material were used

Along with hard straight pipes, corrugation is used. flexible products made of polyurethane or aluminum, allowing you to do without angular details.

The use of an aluminum with a corrugated pipe of aluminum with plastic analogues as a duct: fire resistance and higher strength

Corrugated products are more economical, but lose in design. To preserve a beautiful type of interior, it is better to disguise them under suspended structures or place them in a “blind” area. on cabinets against the wall.

Varieties of elements in the form of section

Depending on the configuration of the pipe, the ducts of the following types are distinguished:

The form of section in many ways affects the technical characteristics and installation method. For example, straight round pipes have better throughput and excellent sound insulation, since air, moving along smooth walls, practically no obstacles (with the exception of angular sectors).

However, due to the cylindrical form, problems may arise with the installation.

The option of installing a round cross section leading from the hood to the ventilation hole on the adjacent wall. Installation elements: 4 pipe segments, 3 round corner knee 90º, gearbox

Rectangular ducts are tightly adjacent to any even surfaces (walls, ceiling, walls of kitchen cabinets), so installing them is much easier. But there is one drawback-the uneven distribution of air, due to which there is a large noise.

The optimal solution for installing ventilation over a suspended ceiling: light plastic pipes of a rectangular cross section with a set of adapters and an output round pipe (to reduce the noise level)

Variety of sizes and sections form

The most popular in housing construction PVC ducts are produced in two versions:

• round with diameters of the cross section 100 mm, 125 mm, 150 mm, 200 mm;
• rectangular with cross.sectional dimensions 55 × 110 mm, 60 × 122 mm, 60 × 204 mm.

The throughput of round ventilation ducts increases with an increase in diameter. The efficiency of the pipe with a diameter of 125 mm is 1.5 times higher than the pipe with a diameter of 100 mm, and the pipes with a diameter of 150 mm above the “hundred.in.law” is already three times.

Polyvinyl chloride pipes cannot be used to transport air with a temperature of more than 50 degrees Celsius. The diameter of the air duct should not be less than the diameter of the output of the channel. Otherwise, the capacity of the channel is reduced

The duct of the round section 100 mm works with the same performance as the box of 55 × 110 mm in size. Round channel 125 mm and rectangle 60 × 204 mm are almost equivalent in air throughput.

A round pipe of 200 mm is available without a wide set of connecting parts. The duct with a rectangular section of 90 × 220 mm corresponds to a round pipe with a diameter of 150 mm, but is rarely applied in practice due to a high cost.

Such wonderful characteristics as::

• the ability to absorb noise and heat;
• A perfectly smooth surface that allows air to pass along the channel with high speed;
• lack of corrosion, which makes it possible to lay pipes in rooms with high humidity;
• indifferent to aggressive influences, ensuring prolonged operation;
• walls treated with antistatic, preventing the accumulation of electric charges, settlement of dust inside the canal;
• sufficient strength and low weight;
• a simple and understandable process of assembling enlarged nodes and spatial systems;
• the manufacture of parts by GOST and TU with the receipt of certificates for compliance with sanitary and hygienic requirements;
• Relatively affordable price.

Of the shortcomings of PVC pipes, low fire resistance, fear of negative temperatures, and the need for antistatic treatment can be noted.

Hard ducts are made by casting and solidification in the molding formwork. Channel thickness at least 3 mm wall thickness. Pipes can be purchased at any supermarket or from manufacturers, the most famous of which are: Era, Ventts, Eco-Trade Company

The white color of the plastic is in perfect harmony with the elements of the decoration of rooms, often the ducts are hidden behind the drywall with subsequent decoration.

The small height of polymer boxes helps reduce the space between the floor slab and the suspended ceiling. Thereby maintain an acceptable height of the room and its cubic meter.

Polymer pipes ventilation device

Subject to certain rules, the installation of air ducts from the PVC passes quickly and easily. A considerable role in this belongs to the methods of docking individual details. A huge selection of connecting parts is proposed: corners, bounces, tees, plugs. When you fail, one part is easily dismantled and replaced with a new element.

The use of thermal insulation shelters

In unheated rooms, polymer canals are wrapped in heat.insulating materials. Otherwise, pipes in winter will be covered with snow frost.

• foamed polyethylene, on the one hand covered with foil, on the other, smeared with adhesive composition;
• a layer of rubber with the same coatings, this material is much more expensive than the first.

Before thermal insulation, the surface of the duct is cleaned of dusty plaque and dirt. The seams are sealed with a special foil tape.

Thermal insulation from foamed polyethylene inert to harmful influences. In the retail network, it is represented in a stitched and non.lung form. The first has no additional molecular connections and is less durable than the second

The stitched polyethylene heat insulator is made using a special technology that creates linear and transverse molecular bonds. The material is very durable, elastic, not losing shape after squeezing.

Thermal insulation from foamed rubber has a microporous structure. The material is resistant to an aggressive environment, perfectly retains heat. Has a foil layer that prevents heat care, provides sound insulation. Due to the high ignition temperature, flammable materials protects against fire.

For thermal insulation of volumetric ducts, especially with street laying of the tracks, use mineral wool slabs.

Design and preparatory work

Before starting design work, you should decide on the choice of ventilation system.

• supply and exhaust with air circulation due to natural gravity;
• supply and mechanical motivation for the movement of air flows;
• combined using the first and second type.

Natural air circulation depends on weather conditions. In the hot season, when the temperature inside the house and on the street is aligned, the inclusion of retractive force is required by installing electric fans in the channels. On sale there are devices focused on installation in the ventilation system of polymer plastic.

When creating natural ventilation in the system, fans and electric motors do not set up, which significantly reduces the cost of the installation and operation of equipment. The mechanical ventilation unit installed in the attic evenly distributes fresh air throughout the house, after heating it in the river operator due to the heat of the outgoing air flow

Installation is carried out according to a previously developed ventilation project. The complex structure of the ventilation complex will require an appeal to professional designers who will tell you how to assemble a plastic ventilation system.

To accurately calculate the area of ​​the ducts and their location, you need to have a certain set of knowledge. Take into account the established standards and make calculations according to a certain algorithm.

Perform working drawings of a simple ventilation installation on their own can be a person who can independently study the basic norms and design rules.

Calculation of the section of the air ducts

To calculate the parameters of the elements of the ventilation system, you should be guided by the instructions of SP 54.13330, joint venture 60.13330, SanPin 2.one.2.2645.

To independently determine the size and number of air ducts, fans and their power, it is easiest to calculate the parameters, applying the rate of air flow per 1 sq. m. Square of a house equal to 3 cubic meters. m/h. In this case, the multiplicity of air exchange and the number of people are not taken into account

Air exchange rate for living rooms. 1 time/hour.

Kitchen with a gas 4 fireplace plate-90 m 3 /h, plus additional 100 m 3 /hour.

Kitchen with an electric stove. 90 m 3 /hour.

A room with a hard.fuel boiler. 1,100 m 3 /h.

A boiler room with a gas unit. 3 volume of air for fuel burning.

Calculation calculation algorithm

To determine the diameters of the air ducts, the standard hourly air consumption for each room is found and in general for the influx and outflow in the system:

• The volume of air in each room will be equal to its cubic meter. To determine it, multiply the length of the room by width and height.
• Take into account the normative values ​​of air turnover for each room and determine the clock consumption of air.
• The results are rounded up and summarize separately by air flow and its removal.
• Compliance with the balance of the parish and air care. the basis of the calculation.
• The resulting total hourly air expenses are used to determine the dimensions of the main supply and exhaust channels.
• Set the required air speed-3-4 m/s.
• According to the diagrams in regulatory reference books, the desired diameter of the pipe is found.
• In special tables, you can also find an equivalent cross.sectional box.

Working drawings and circuit will tell you how to assemble a plastic ventilation system in accordance with the designed power. From performing independently according to the calculation of the calculation.

According to the drawings, the total length of the ducts, the number of straight sections, turns, the required tees, adapters and fasteners are determined. According to calculated data, fans, filters and check valves are purchased

How to choose pipe cutting scissors

For home use or for use from time to time, usually take mechanical scissors for cutting pipes. The design is chosen at the same time, so that it is “cheap and reliable”. Most often they buy scissors with rattle. In principle, an acquitted choice. Beginner professionals work and. You just need to choose the right model.

In general, you can give the following recommendations for choosing the type of cutter for pipes. A thin.walled pipe without reinforcement from any material is cut by a pipe.normal or scissors, regardless of the structure. Diameter restrictions-32 mm, wall thickness-up to 4-5 mm. Any pipes, what are? Yes, all: metal.plastic (MP), polyethylene (Pert, PEX), polyvinyl chloride (PVC), PVDF, low.pressure polyethylene (PND), polypropylene (PP, PPR or PPR), including reinforced with fiberglass and even small pipes (with a diameter of 16.20 mm) reinforced with aluminum foil. For the same pipes, but with a diameter of 4 mm or more, we need more powerful scissors. They should be more in size, and “tougher” in assembly.

Which scissors are better for PVC, PPR, PET, MP pipes

For reinforced polypropylene and PEX with a diameter of 25-40 mm, a good roller cutter is required, and for even more, a guillotine or the same roller scissors, but from a professional series are already needed.

Technical specifications

There are no difficulties in this paragraph. Two positions must be monitored:

Look carefully at these characteristics. It is a shame: you buy scissors for polypropylene pipes for a couple of thousand, and then it turns out that it is precisely polypropylene that they do not cut.

First of all, we look at whether the type of material we need, then pay attention to the diameters

Another such advice. It is better to take a cutter that can cut the pipe to the size of a larger diameter than you plan to mount. For example, you will cut a 32 mm pipe as much as possible, but take a tool for 40 mm. Why? A pipe of maximum size is very difficult. Namely, they usually do the main wiring. Smaller diameter only goes on layering. A tool for larger diameter in size is slightly larger (and a little more expensive), but it cuts easier.

By the way, a cheap tool has a pipe declared the largest diameter, sometimes simply does not fit into the holder. So you need to check. If there is no piece with you, compare the dimensions of the cutting part with similar. The dimensions are more or less the same? Excellent. If you have chosen in appearance less, it is better to postpone.

Frame

The case of the scissors can be made of silumin or other such alloy and steel. Inexpensive models from silumin can break if you are very crushing when you cut a large diameter pipe. So if you take silumin, so those that are thoroughly thorough and weigh not one hundred grams. We inspect the case for cracks, caverns, burrs. there are such damage. They immediately put them aside. Next, we examine on the following signs:

• Need a strong powerful case.
• Lack of backlash. If the new scissors hang out, then the cut will not be even. And if you also work with them, you will have to hold everything with your hands for sure.

We examine the handles. The main thing is that they are convenient. We’ll have to squeeze them, so the sharp edges, inconveniently lying in the hand, too, we put off. The best option is rubberized or with rubber lining. But this is already a non.budget series.

What can be the blade

The main working part of the pipe cutting scissors is the blade. It can be made of instrumental (cheaper and soft type of steel) and alloy (more expensive and durable) steel. As a rule, a blade of alloy steel can cut plastic and copper pipes. Scissors for polypropylene pipes have a instrumental steel blade.

The type of steel is not all. We must look at the thickness of the blade. If it is thin, with a large diameter, the cut goes to the side and cuts the pipe at an angle. But we need it under 90 °.

Carzac mechanism for pipes type “Pistol”

Why cut it strictly at right angles? To make the connection strong and durable. This is important for pipes of any type, but critically important for metal.plastic and polypropylene, reinforced with foil.

The thicker the blade, the easier it is to work. By the way, there are models of scissors for polypropylene pipes with a removable blade, there are those in which the blade and the “ladder” of the ratchet mechanism. one whole. The second option is more durable. The fewer the connections, the longer the service life.

What else can you cut pipes

Sometimes you just need to make a pair of cuts on the pipe. Buying for such a case even inexpensive scissors for cutting pipes does not make sense. This is what else you can cut off plastic, metal.plastic and polypropylene pipes:

• Corner grinder with thin (1 mm) disk. The pipe is clamped in a vice. Conveniently cut off 1-2 mm. This is necessary when fitting. None of the cutters or scissors, such a small piece is not able to cut off.
• Miter saw. Cuts perfectly. If there is, you can work for her.

After working with this tool, you usually need to correct the cut. If there are burrs, remove them, pour the shavings. In general, the cut should be even, and the pipe is clean.

Advantages of plastic ducts for kitchen hoods

Plastic air duct for kitchen hoods

Any kitchen room must have a ventilation system. The hood in the kitchen is not another fashionable tendency, but an important element subject to environmental and hygienic standards.

Its absence can be the cause of not only unpleasant and harmful odors, but also the formation of traces of cooking on your kitchen furniture, which can later cause a quick loss of the aesthetic appearance of your kitchen as a whole.

Hracts can be with a duct and without it (the second group has a number of disadvantages compared to the first, since a filter is required, which will fully purify the air only with its timely replacement).

The main purpose of the duct for ventilation is the withdrawal of already worked out air flow. Without such an element as a plastic duct for a kitchen hood, the ventilation system as a whole could not function normally and fully.

When installing hoods in the kitchen, as well as proper ventilation, the task arises in the form of choosing a duct for the kitchen. Today, one of the best ventilation option is the plastic model of the duct for the hood. She, of course, like all products, have a number of advantages and disadvantages.

1 What are the pluses and disadvantages have plastic ducts for extract?

The priority choice of most consumers is precisely plastic air vents for extract in the kitchen, the main advantages of which are less noise, since plastic does not resonate with air, like metal and its light installation.

A plastic duct is made of such environmentally friendly materials as: metal.plastic, PVC. silicone, polypropylene. They do not distinguish unpleasant substances and smells during ventilation, so the operation of such a duct will not bring not quite desirable surprises.

One of the types of plastic duct

Such an element of the exhaust system is not subjected to corrosion, in connection with which it has a fairly long service life. Of course, plastic products are not provided for use in ultra.high temperature conditions (the elements of the system may melt). Therefore, it is better not to install them too close to the heating surface of the stove.

The installation of a plastic duct will take much less time, and this is another plus. You can do this even yourself if you deal with the ventilation instructions.

2 What to be guided by when choosing plastic ducts for extract?

After you have decided to buy plastic ducts for hoods, you need to determine the existing varieties, and their dimensional mesh. There are two main forms of plastic ducts: rectangular and round.

A rectangular plastic duct for a kitchen hood can be used in a variety of rooms (from kitchen to industrial facilities). By choosing this type of duct for ventilation, you will get an advantage in the form of a light installation. They are used if you want to save space in the kitchen, as well as in hard.to.reach places.

So the flexible plastic air vent is connected.

However, plastic rectangular ducts for kitchen hoods have a small drawback: the level of noise is determined in them. In addition, swirls may appear in them, which reduce the effectiveness of the hood.

Round air ducts are of better efficiency, since there are no swirls in them. Of course, this type of duct takes up more space, it is harder to install them than rectangular ones, since a round hole in the wall must still try to knock out.

Also, you can choose flexible or plastic models of air ducts for ventilation or for example hard. Hard ducts are more reliable because they are not afraid of mechanical damage and can be used in various rooms.

The plastic flexible model of the duct is a more universal device, can be used both in rooms designed for constant use and for temporary buildings.

It will be true for decisions to buy a flexible plastic duct, for example, for a portable laboratory. For the kitchen, it is best to use hard plastic ducts.

If you decide to buy a plastic flexible air duct for the kitchen, you have decided on the variety and shape of the product, you need to choose the optimal sizes of plastic ducts for exhaust systems and kitchen hoods.

Hood connected to a plastic duct

This is better to do in accordance with the letter of the instruction. If it speaks more specifically, flexible rectangular ducts can have the following sizes: 110 × 55, 120 × 60, 204 × 60. Round flexible plastic ducts can have a diameter of 100 mm, 125 mm or 150 mm.

Flexible air ducts can be made from 50 mm to 500 mm, and hard in turn up to 1000 mm, with wall thickness up to 5 mm. In any case, the flexible air vent will be much more interesting than corrugated.

2.1 What you need to know when installing a plastic air vent?

After hanging all the pros and cons, and making a choice in favor of modern plastic ducts, you have a responsible stage. installation and the choice of plastic ducts for extracts as well as the entire ventilation system.

It is best to allow a duct to install a duct, but if you have at least a minimal understanding of installation work, and skills in this area you easily install plastic ducts for hoods, in your kitchen, yourself.

Firstly, it is necessary to draw up a design plan for the work, for the correct installation of all elements. Plastic air ducts for kitchen hoods and components of the system, as well as connecting elements, all this, in the exact quantities, must be calculated.

Not all sizes that are necessary for you can be available on the market, this situation can be corrected using connectors that can connect the air ducts.

Varieties

The ducts used for the kitchen hood differ in the manufacturing material, shape and level of stiffness.

Expitable pipes are made of several types of plastic:

The first 3 types are suitable for connecting to the exhaust device in the kitchen: they are resistant to high temperatures.

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

Release air ducts with a rectangular or round section.

• Rectangular plastic channels are compact, easily hidden under a hinged ceiling, more convenient in terms of installations.
• Round pipe for hoods differ in greater bandwidth and lower noise.

Design features and dimensions

Remember that when purchasing air ducts from PVC, you need to stock up on adapters that will be needed to connect a plastic pipe and hood. Also, adapters are used for bends of the duct and connecting to a common ventilation. If a corrugated product is used for hoods, then on adapters for bending the pipe you can save.

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

Any bend also negatively affects the functionality of the hood. When installing an air duct in the kitchen, try to avoid angles of 90 degrees. This will overload the hood, which will significantly reduce the service life of the product.

It is allowed to make no more than 3 knees and bends.

The diameter of the plastic pipe is selected according to the cross.section of the ventilation hole. The dimensions of rectangular and square kitchen ducts from PVC are standard. The following values ​​are more often used: 110 × 55, 120 × 60 and 204 × 60 mm. The dimensions of round plastic pipes vary from 110 to 150 mm in diameter.

You can purchase these products in almost every construction store. It is worth noting that the price of flexible ducts is slightly higher than for flat PVC channels.

How to cut ventilation pipes

High.quality ventilation in the kitchen allows you not to breathe with evaporation, which inevitably accompany the cooking process, and ensures the safety of furniture. The hood is mounted directly above the stove, and the ventilation shaft may be at some distance. For their connection, special pipes are used. ducts. Let’s find out how to choose the right, assemble and disguise a plastic duct for a kitchen hood.

Plastic pipes are distinguished by a long service life and ease of installation. In addition, PVC products are safe in terms of environmental friendliness and hygiene.

Varieties

The ducts used for the kitchen hood differ in the manufacturing material, shape and level of stiffness.

Expitable pipes are made of several types of plastic:

The first 3 types are suitable for connecting to the exhaust device in the kitchen: they are resistant to high temperatures.

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

Release air ducts with a rectangular or round section.

• Rectangular plastic channels are compact, easily hidden under a hinged ceiling, more convenient in terms of installations.
• Round pipe for hoods differ in greater bandwidth and lower noise.

Design features and dimensions

Remember that when purchasing air ducts from PVC, you need to stock up on adapters that will be needed to connect a plastic pipe and hood. Also, adapters are used for bends of the duct and connecting to a common ventilation. If a corrugated product is used for hoods, then on adapters for bending the pipe you can save.

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

Any bend also negatively affects the functionality of the hood. When installing an air duct in the kitchen, try to avoid angles of 90 degrees. This will overload the hood, which will significantly reduce the service life of the product.

It is allowed to make no more than 3 knees and bends.

The diameter of the plastic pipe is selected according to the cross.section of the ventilation hole. The dimensions of rectangular and square kitchen ducts from PVC are standard. The following values ​​are more often used: 110 × 55, 120 × 60 and 204 × 60 mm. The dimensions of round plastic pipes vary from 110 to 150 mm in diameter.

You can purchase these products in almost every construction store. It is worth noting that the price of flexible ducts is slightly higher than for flat PVC channels.

Choose and buy air ducts online

The range of air ducts by Leroy Merlin is huge. more than 70 varieties. You can’t look at such an amount in an ordinary store. there is no time or effort.

Buying via the Internet is safe and convenient! You can buy goods without leaving your home and without visiting the store. All purchases will be delivered to you home. And if something does not work, you can get the return of the goods.

In addition, in the online store on each page of the product you can familiarize yourself with the exact characteristics and real reviews of customers.

To select a suitable duct model, follow the link

Mounting

The most practical and convenient pipes in installation are corrugated. They are cut into pieces of the desired size and are connected to the elements of the hood and the ventilation shaft in the kitchen. It is recommended to replace the standard ventilation lattice with a special. with a mounted connecting nozzle. Squiring clamps are used as fasteners. For greater reliability, the joints are treated with sealant.

note! Corrugated pipes are installed in the most stretched position. This approach provides nominal throughput of kitchen ventilation.

Smooth PVC air ducts are mounted according to the same scheme. The pipe is cut with a hacksaw for metal into pieces of the desired size and attached to the elements of the hood with adapters. The pipe should delve into the pipe by about 50 millimeters. The mounting places are treated with silicone.

Advice! The installation of the hood is performed taking into account the direction of air movement. Otherwise, the service life of the product from the PVC will significantly decrease.

If you have installed a powerful hood, the reverse traction effect may appear. In other words, in the kitchen there will be aromas from the overall ventilation shaft. This applies to powerful models whose performance is about 600-700 cubic meters of air per hour. To avoid such a phenomenon, it is recommended to install a check valve. These devices can be made in two versions:

The valve must be installed vertically, otherwise it will work under its own weight.

You can do it differently: take the hood directly to the street. To do this, a hole of the desired diameter is made in the wall of the house. You should know that before the start of such work it is necessary to obtain permission in the housing and communal services and BTI.

To avoid such difficulties, it is recommended to consult the seller about the power of the hood and correlate these parameters with the area of ​​the kitchen room. For the needs of an average family living in a typical high.rise building, a low.power hood is enough.

How to choose the right and install air duct for hood?

Read is required

Select and correctly install an air duct for hoods is an important point in the arrangement of the kitchen. The quality of the air in the room, the noise level, the aesthetic type of kitchen will depend on this. And ultimately the health of the whole family.

Differences in the kitchen exhaust system and ventilation

The ventilation system is designed to constant air update in the room. It is equipped in the kitchen and toilets. Most often, a natural motivation scheme is used. The capacity for the kitchen is 60 cubic meters per hour, for the toilet. 25. With poor ventilation, condensate accumulates in the house, a fungus may appear over time. This is dangerous for the development of diseases of the respiratory system.

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In the ventilation device, the air goes through special channels inside the walls on the roof or to the attic. Stream movement is carried out due to the temperature difference inside the house and outside, as well as the pressure difference. New air enters the room through the cracks of windows, doors.

The exhaust system is installed in the kitchen to remove smells, excessive humidity and oil waste formed during the preparation of food. Due to the operation of the fan forcibly draws air from the kitchen, then it is diverted through the air duct to the ventilation duct. Installation of ducts for kitchen hoods should be carried out so as not to violate the ventilation of the room.

Is it always possible to install hood?

It is prohibited to connect the duct tightly to the duct. On the way to the exit, the air should overcome obstacles from an oily grid, motor and turbine. In addition, the air fence is not under the ceiling, as it should be, but from the level of the hood. All this makes ventilation ineffective, especially in the summer, when the thrust is weak. In addition, a complete blocking of total ventilation can lead to the accumulation of natural gas in case of a malfunction of gas equipment and cause an explosion.

Therefore, air ducts for hoods are mounted in special ventilation grilles with a check valve. There is a hole for the duct in such a grate on top, and from below there are slots for ventilation. When the exhaust is turned off, the air passes freely through the holes and the duct. During the operation of the device, the valve does not allow the designed air to return to the kitchen. The check valve can be in the form:

It must be installed vertically at an angle of 2 degrees. In this case, the valve opens under the influence of its own severity, although it does not protect 100 % of the reverse entry of dust.

It rarely happens that there is no ventilation shaft in the house, there is no entrance hole in the right room. Or in old houses, natural ventilation is greatly disturbed, and the stretched air from the kitchen enters the neighbors. For such cases, recirculation hoods are suitable. The principle of their work: they take air out of the kitchen, pass it through filters (coal, fat) and return back. The disadvantage of such a system is the need to constantly change filters. It turns out expensive and uncomfortable. In addition, such hoods do not solve the problem of high humidity in the room.

Types of air ducts for hoods. Advantages and disadvantages

The duct to the hood can be attached flexible or stiff. The most popular models are made of plastic and aluminum. The choice of the buyer also depends on the financial capabilities and the general style of the kitchen.

Plastic air ducts for hoods

They have a neat appearance, fit into almost any interior of the kitchen. Even surfaces are less contaminated and easier to clean, do not rust. Less noise is created when air passes through the pipe. Since this is a hard product, a more accurate calculation of the size is required. When installing a duct made of plastic for a kitchen hood, it is necessary to use adapters and connecting elements. Turns are more sharp than that of flexible products. Costs more.

Plastic is not as resistant to high temperatures as metal. If necessary, it can be covered with moisture resistant and heat.resistant paint to the tone of kitchen furniture. There are:

• Round. in this case, no adapter is needed to join the hood;
• oval;
• square;
• Rectangular air ducts. It is convenient to carry them along the wall above the kitchen furniture. You can collect the design of any trajectory. One of the options of rectangular are flat ducts that occupy very little space and are almost invisible.

Possible transitions from round products to rectangular and vice versa.

Gofra duct

Corrugation is made of different materials: aluminum, steel, plastic. The most common is the corrugation of aluminum. This metal is light, withstands high temperatures. The corrugation should be installed in the most stretched state. Then there will be less resistance to the passing air, below the noise level. True, stretching, it can no longer be squeezed back. It is easily deformed, so accuracy is needed when installing it.

The duct made of aluminum is a flexible design, it is simply installed, it costs cheaper. Installation is carried out using clamps: it joins the hood for the umbrella flange, to the ventilation pipe behind bars with a check valve. The joints are treated with sealant (silicone) or strengthened with aluminum tape. You can not use superclly.

Mechanical or electric

For the installation of a PP system of heating or water supply, experts advise a hand.made pipeline. It is easier in design.

Manual is less compared to an electric tool. The second is often used by professionals in performing a large amount of work. Electric devices allow you to get more even ends with minimal effort and time.

Manual type pipelines compact. Large.sized electric models cannot be used to implement inserting into the current pipeline. In such cases, scissors for a polypropylene pipe are always used.

One option is to adapt with the battery. The weight of such a tool is from 1.5 to 2 kg. The presence of a battery allows you to freely use equipment without linking to an electric outlet. A completely charged battery is enough for work within one day.

How to cut polypropylene pipes is not worth

So that the edges of straight pipe products are even, cutting is not recommended:

• hacksaw on wood or metal;
• an electric jigsaw, even at a quiet move;
• electric drill with a disk nozzle from the side of the inner surface of the pipe.

If you use such devices, the edges will turn out to be torn. They will have to be carefully cleaned and aligned before soldering to create a reliable connection.

Cut off with a hacksaw

Corner grinder is also not suitable for cutting polypropylene. The reason for this is the high speed of the disk element. Because of this, the material heats up and begins to melt.

It is also impossible to use cutting devices for metal rolling. They will tear polypropylene, since their knives are not designed to work with polymer materials.