How to cut a plastic pipe for an air duct. At right angles

How to cut a plastic duct?

If you have a end saw, which is large enough, it is definitely the easiest way. A desktop saw can work as a last resort if you use a sliding guide. Make a couple of marks with a measuring tape, and then draw a fishing line for a trimmer between them.

  • Scabble for metal. The most common way
  • Electric. The fastest and most convenient way after scissors
  • Manual circular saw. This method is suitable only for thick.walled water pipes.

How to cut a polypropylene pipe if there are no scissors?

Corner grinder. for cutting pipes, a cutting disk for metal will be required. The main point in the operation of the corner grinder is the exact regulation of the effort, it is impossible to crush too much on the tool. Electricity is the most convenient way in the absence of special scissors.

In domestic conditions for cutting pipes, you can use manual pipelines (for example, Ridgid pipelines). Using special prunes or scissors, the pipeline allows you to cut off the pipes up to 10 or more centimeters with diameter.

Special tools

Professional plumbing use special pipelines. Such tools are produced in different versions: roller, battery, guillotine. The use of pipelines requires some skills. In the absence of professional equipment at home, you can use other methods. This is especially true if a large amount of work is not supposed.


One of the most popular home methods of PVC pipe cutting is the use of metal hacksaw. An important condition for this method is a reliable pipe fixation. You can use a vice or other clamping device. The best option would be to clamp the site that should be cut, on both sides. This will not only prevent sliding during cutting, but also reduce the risk of injury when using a hacksaw.

How to cut a plastic pipe in an inaccessible place

It often happens that the PVC sewage pipe was carried out close to the wall or even laid in the recess. To get to it to cut it off with a special tool, it is not possible. So then do? But there can be many such examples and not only with a sewer pipe, but also with polypropylene pipes of large or small diameter, which are also located in places.There is a rather simple way out of such situations.

How to Cut and Join 1/2 to 4 inch ABS, PVC and CPVC

Cut the pipe in an inaccessible place

Everything is banal simple. We will open from the coil about a meter of thread, it is not necessary to cut off. You can just hold in your hand. We start a thread for the pipe.

If there are gloves, then it is better to put them on. We pull the thread with both hands at the place where you need to make a cut. And we begin to drive the thread pulling one hand to you, then the other.

The pipe must be securely fixed so as not to tear it out. If not, ask someone to hold it while you saw.In a minute or two pipes will be cut.

It is quite simple, but it requires dexterity. Cases are not rare when the thread is torn during cutting. It doesn’t matter, take another and continue.

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

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.

how to cut pvc trunking 90 degree

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

Installation of the ventilation complex of polymer pipes

At the preparatory stage, the entire variety of parts are harvested according to the design specification. For insurance increase the supply of fittings and fasteners by 10 percent.

You will need a simple set of tools:

  • for cutting plastic pipes and boxes of a hacksaw for metal or wood, to accelerate the work. a small saw “Corner grinder”;
  • Peorator for drilling holes in the walls and ceilings;
  • sandpaper, glue, sealant, mounting adhesive tape;
  • roulette, marker;
  • Electric screwdriver.

They begin work with the assembly of enlarged nodes using the entire arsenal of shaped parts. The main element of collected modules and ducts is a straightforward box or pipe with typical sizes. Round pipes and rectangular PVC boxes have a length in the interval from 0.35 to 2.5 meters.

For a flat cut on the surface of the box or pipes, draw an accurate fishing line for a trimmer of the saw. You can use a laser tool. Sawing strictly along the intended line. After cutting, smooth ends remain without burrs and roughnesses.

The large section is applied to the wall or ceiling, specify the binding, places of fasteners and fixed in the design position.

When wiring pipes, it should be borne in mind that each turning angle reduces the efficiency of the system. The smaller the total length of the ducts, the higher their performance. For laying air ducts in a private house, it is better to use rectilinear parts 2.5 meters long, so as not to make unnecessary connections.

Air speed in channels with a round section is higher than in rectangular boxes. But to save space, flat boxes are more often used.

For insurance from the resulting condensate in the pipes, drainage holes are made. To remove the drops of dew with horizontal channels, they give a slope of 0.01-0.015.

The kitchen hood is connected to the exhaust channel by means of an adapter from round to a rectangular section. The attachment site is sealed with silicone mastic.

The hood should be located near the output of the exhaust channel, thereby reducing the loss of the speed of removal of kitchen fumes. Recommended diameter of the exhaust channel. 125 mm. Power of the exhaust installation of about 200-300 cubic meters.m./hour. The height of the hood from the surface of the electric stove is 65-75 cm, gas-75-80 cm

For passage through the wall, the duct is placed in the coupling. Canal outputs are closed with decorative lattices. The sagging of the duct should not be more than 50 mm.

Wiring ventilation ducts in a low.rise building

On the example of a typical residential building, you can find out how to assemble a PVC ventilation system.

In a two.story cottage with a standard set of rooms, you need to lay one vertical exhaust channel with tees for connecting lateral taps to living rooms. With this plastic duct, stuffy air from bedrooms and living room will be transported to the attic.

Nearby, the attic is put from the attic to the first floor with the wiring of lateral branches on the zones of the supply of fresh air to replace the remote.

Two air ducts are provided for the kitchen:

Autonomous exhaust channels are extended to the bathrooms to remove fumes from the bathroom and air from the toilet.

The hood is connected to the ventilation center through the tee and the check valve with the displaced axis. When the hood is disconnected, the valve is open, the air into the channel from the kitchen is removed past it. When the hood is turned on, the valve overlaps the input hole, kitchen evaporations do not enter the rooms

In the variety of connecting parts of plastic air ducts there are plastic holders of round shape for attaching pipes to a flat surface.

For boxes, fastening of a rectangular shape of the corresponding sizes is provided.

Plastic fasteners work like latches, tightly wrapping up the fixed element. You can use metal suspensions for drywall as fasteners to the ceiling.

On the air ducts under the ceiling. tees and taps are also installed for supply or removal of air from different zones of a residential building.

All channels are displayed in the attic and there, using flexible round ducts, are connected to the internal block of the system. Adapters for attaching attic round pipes are placed under the ceiling of the last floor.

plastic, pipe, duct, right

All compounds are recommended to be embedded with silicone sealant to exclude air loss. If the boxes are closed with a suspended ceiling, all the joints are additionally sealed with mounting tape. Suspended fasteners are screwed to the ceiling with self.tapping screws and dowels

Depending on the chosen ventilation method, one powerful device is placed in the attic that provides an extract and a flow of air throughout the house, or fans are placed in each duct.

In the cold attic, the pipes are necessarily insulated. The height of the ventilation ducts of the roof is determined as follows: in the drawing, the horizontal straight line is carried out from the roof skate, another beam is drawn from it up 10 degrees. He will be a lucked height of the span of ventilation pipes. If the distance from the skate of the roof to a ventilation pipe is less than 150 cm, it rises above the skate of the roof by 50 cm.

Silicone sealant for smearing seams has white color, retains elasticity when drying out. For more reliable sealing, metallized tape is used.

For better air circulation, free space is left at the doorway at the door.

Methods of connecting plastic pipes

Polymer pipes are interconnected by several ways:

  • using a coupling worn or inserted into a pipe;
  • thermoresistor fittings made of special polyethylene with metal spiral;
  • butt welding with welding equipment.

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

plastic, pipe, duct, right

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 is more 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.

Hard polymer products

By choosing a plastic pipe for the installation of the hood, you can not worry about the pernicious corrosion exposure and internal cleaning of the ventilation system. Passing through a smooth surface, the air flow does not meet obstacles in its path and does not create a big noise. So that the duct does not stand out against the background of the wall, PVC pipe for hoods in the kitchen is laid above the cabinets.

Hard pipes made of reinforced plastic without difficulties are cut into size. Cut them with a hacksaw or electric

Ventilation plastic pipelines are assembled, connecting with cold welding. providing tightness

The housing of wall ventilation valves is performed from plastic pipes. Material without destructive consequences adjacent to concrete and brick

Light air ducts of plastic can be perfectly hidden behind the ceiling plinth designed to mask communications

Types of pipeline equipment

In stores, a tool for cutting polypropylene pipes (PP) is offered the most different. These are both manual mechanical and electrical devices.

Each of them has its own virtues. Choosing the most suitable equipment should be based on the volume of work and their complexity.

Polypropylene pipes can be cut using scissors or roller tools. the first option is cheaper, and the second is more effective in work

When choosing equipment for cutting polypropylene pipes, the main attention must be paid to two points:

  • The blade must be made of alloy steel.
  • Each pipeline model has two indicators. the minimum and maximum pipe size. This range should be selected so that it is enough to perform work.

The case of the case of such equipment is usually made of metal. And best when it is aluminum, not steel. A pipeline with aluminum handles is light by weight, work will take less strength to them. Soft polypropylene pipes do not require unnecessary efforts when cutting. Aluminum tool will cope with arising loads without problems.

A pipeline can have replaced or irreplaceable incisors. Sooner or later they will be worn out. In the second case, the tools will have to be bought again. However, if the cutting device is needed for one.time work, it is better to take a cheaper model with an unprofitable equipment.

Pipelines. tools that allow with extremely high accuracy to cut the polypropylene pipes for their future connection

The pipe pp is cut during the repair of the old or the construction of a new pipeline of water supply systems, low.temperature heating, sewage, ventilation

Before buying a hand tool, it is important to try it, hold it in your hands and decide whether it will be convenient to work

Ergonomics. Not the most important characteristic for the power tool. However, it is also advisable to hold him, as a hand.made pipeline, in order to understand how simple and convenient it is to control

In the cutting of polymer pipes, which, in addition to the traditional unstable shape, also have lightness, it is important to decide whether to buy a pipeline with an mounted device for fixing or attach it in a vice or in a stupor

If it is supposed to cut the pipe of the canopy during the repair, it is better to buy a tool with a device for reliable fixation of the pipe

If you have to carry out a one.time cut and numerous cutting operations are not planned, it is possible to cut off the pipe pipe with a jigsaw, ordinary hacksaw or electric saw, fixing it first in Stusl

Option #1. Guillotine

The simplest in design and the exact quality of the cut pipeline equipment is guillotine scissors. They can be manual and electric drive. Structurally, this is a blade that descends onto a pipe from polypropylene, which makes an even and strictly perpendicular to the longitudinal line.

In the simplest and cheapest performance, the guillotine pipeline resembles a small classic guillotine with a blade, a handle with a rod to increase the pressure force and an opening clamping clamp for the pipe from the bottom

Most of the manual guillotine is designed to cut pipe products with a cross section of up to 70 mm. But some models are subject to diameters of 100-150 mm. This is enough to perform installation work at home. Everything that is higher is already referred to as industrial equipment.

The knife as they press on the soft polypropylene easily open it. Pipe deformations do not occur due to the severity of the cutter coated with teflon and the smoothness of its movement. After the cut of polypropylene, additional processing of the end is no longer required. The pipe is completely ready for soldering and using fittings.

The only drawback of the guillotine that is worthy of mention is the low speed of work. Each time the blade needs to be returned to its original position by prolonged twisting the rod. But the cut is perfectly even, and for this you can twist the handle. However, if it is planned to cut polypropylene pipes, then it is better to choose a different type of pipeline.

Giliotin pipelines are equipped with metal knives made of hardened instrumental steel alloy

When giving a cutting element, it can easily and simply be replaced with a new detail. It is attached elementary. two or more bolts

The presented model cuts polymer pipes without metallic reinforcement. But easily copes with the cut of hoses and pipes with the strengthening of fiber fiber

Option #2. rattles

This class of a pipe.cutting tool in shape resembles ordinary scissors with two handles. Only their blade is on one side. The second half is made in the form of a semicircular stop where the pipe should be placed during cutting.

They are equipped with a ratchet mechanism (rattle) so that the knife moves smoothly, and at the same time they had to apply efforts to a minimum.

Rhistry pipelines are designed for cutting thin pipes with a cross section of 15-30 mm, with a blunt cut or harsh pressure, pipe walls made of polypropylene are simply crushed by this tool

The main disadvantages of this cutting equipment are a high probability of obtaining a oblique cut and a possible crump of pipe. In fact, these are big manual scissors. You need to use them skillfully. Our site has a detailed article on how to use this type of pipeline. Read more. follow the link.

By inexperience, the slightest slope in their hands leads to the formation of a crooked end, which then has to be undermined. And if the pipe is also crumpled, then it will need to be straightened out from the inside with a calibrator.

The same type includes pistol pipelines with a crack. It is much easier to work with them. There are very little efforts for cutting, and the cut is more even.

The knife return to their original position occurs at all as a result of pressing the button due to the spring. This is the best option for cutting polypropylene pipes with thick and more solid walls.

Than and how you should not cut polypropylene?

In addition to the above specialized pipelines, polypropylene pipes can be cut:

One “but”. The edges of the pipe as a result of using these “improvised” tools are torn. This is not only ugly, but also unacceptable.

Before soldering, the pipe ends must be cleaned from all burrs and leveled, otherwise the connection will turn out to be fragile. Such aggressive cutting almost always leads to problems on a mounted pipeline in the future.

It is not recommended to use corner grinder. Due to the high speed of its disk, the polypropylene pipe will begin to heat up and melt. A similar situation can occur when using an electric lobe, if you turn it on to the entire power.

These tools should be used to cut plastic only in extreme cases, when there is nothing at hand.

If the plastic pipe has to be cut with a hacksaw, then it is necessary to do this by installing it in the knock, it is extremely recommended to cut it on weight, it will be difficult to get an even neat edge

Regardless of the chosen tool, it is impossible to press it on a polypropylene pipe when cutting. This applies to the use of both corner grinders and professional pipelines.

Efforts should be increased gradually, otherwise the plastic can simply crack. With severe pressure in the pipe walls from PP, invisible to the eye of the destruction, which will then lead to a gust of pipeline.

There is another argument against a strong pressure of the cutting tool on a pipe made of polypropylene. deformation in terms of geometry. The walls in the place of such pressure begin to remember, which is why the cut in the cross section from the circle turns into an oval. And the end of the welding with fitting should be perfectly round. Then you have to straighten it with a calibrator, which will require time and effort.

In order to prevent the bending of the walls, a couple of round bars of wood of slightly smaller diameter should be inserted into the cut pipe. The knife will have to pass between them when cutting polypropylene. So the plastic will definitely not bend, but will be spread as it should.

It is categorically not to use a strip saw or circular for cutting. Polypropylene is too soft and at the same time too fragile for them. On the one hand, the pipe can be pulled out of the hands, and on the other, without chips and cracks at the site of the cut, it will definitely not cost here.

It is also not recommended to use pipelines intended for pipes from metals. Their knives are made of other material with slightly different characteristics.

They will not cut plastic, but tear. The exception is only universal tools for all types of pipelines. But they cost a lot, this is more option for professional plumbers.

Advantages and disadvantages of scissors for polypropylene

The pluses of scissors for cutting polypropylene pipes can be attributed to the following:

  • high quality of the resulting incision;
  • lack of need for a preliminary processing of the edge before welding;
  • a short time spent on the incarnation of the section;
  • simplicity and ease of process;
  • the simple angle between the cut plane and the axis of the pipe;
  • When using a battery tool, physical efforts are minimal.

There are not so many characteristics that can be attributed to shortcomings:

  • The diameter of the pipe cut off by scissors is limited (as a rule, not the most 42 mm);
  • a hand tool asks for noticeable efforts, with frequent use, a hand gets tired.

If the quality of the tool is not extremely the highest, or the blade is bluntly, the evenness and smoothness of the strip of the cut may suffer, but this is not a shortage of the tool as such, but only asks to take scissors for cutting polypropylene pipes with supple and accuracy

Other rules for using sewer pipes

When installing a vacuum cleaner on sewer pipes in a private house, it is impractical to have these pipes and an appropriate exhaust system together. As a rule, such a scheme is used when performing work in residential buildings. This is not done in private houses due to the risk of creating reverse traction, which can spread various smells throughout the house.

The pipe should be at a height of at least 1 meter above the roof. If you need to connect several systems, pipes with diameters proportional to each other should be used throughout the network

It is important to separate the chimney from ventilation: to achieve maximum fire safety, it is necessary to observe a distance of at least 2 meters between the chimney of the furnace and the ventilation shaft

In fact, ventilation can be organized not only from sewer pipes, but also from corrugated pipes. However, due to the great wavyness of the internal channel of such pipes, resistance to air masses increases. In this regard, they are used to carry out ventilation in sanitary rooms, where the length of the channel is very small.

Given all the positive and negative features of sewer pipelines, it is necessary that their installation is carried out after competent calculation. Following the instructions is quite simple to create high.quality, reliable and safe ventilation in a private or residential building. It is best to entrust the work to professionals who will take responsibility for all the stages of work. from the purchase of the necessary materials and equipment to their installation and commissioning.

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.


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


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.

Attention! The kitchen designer earned on our site. You can familiarize yourself with it and design your dreams for free! The designer of the wardrobe designer may also be useful.

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.

Councils of specialists

As in any other work, when performing holes, there are features and nuances that should be known to achieve the desired result. For example, how to choose the right hole size. The choice depends on the material from which they are made. If the hole is made of wood, then it is necessary to leave a gap, which is determined by the thickness of the heat and waterproofing layer. It is not recommended to make too large, more than 10 cm of allowances, in this case it is difficult to cook them. It is sometimes difficult to make a round hole in a tree in a tree. It is allowed to make a square hole, which in practice is much easier to do.

However, in the concrete walls and ceilings it is better to make holes with an exact diameter. This material is resistant to temperature and humidity fluctuations. One of the typical errors in the work may be the following features of building a house:

  • wiring. Without knowing the exact electrical circuit, do not start work. Restoration will take a lot of time and money;
  • equipment. Without special equipment, it is difficult to find a place where its absence is guaranteed. If the drill suddenly comes across an obstacle, stop the work, try to make a hole in another place or cut the metal;
  • Weakening of the bearing wall. The hole in the concrete monolithic wall can be made without worrying. However, a brick or block wall is less durable. Working with a hammer, you can easily violate the integrity of the site above the hole, which can crack, and in some cases collapse.

All work must be carried out in accordance with the current rules. Holes with a diameter of less than 200 mm are not regulated and can be made by real estate owners at their discretion. If it is necessary to drill a well with large values, it is necessary to coordinate this operation with the relevant authorities, otherwise serious problems may arise, up to a slight fine and restoration of the well done.

The main types of instrument cutting propylene pipes

All modifications of the equipment produced for cutting thermoplastic polymer propylene pipes are divided into several structural options.

Precision scissors-have a fairly simple, reliable crack-cutting mechanism. With this tool, you can dissect and fragment products with a diameter of 3.0–41.5 mm. The cutting tool has a steel blade (alloyed brand) with a jagged rail that allows you to perform quite light, even cuts of propylene pipes.

Using precision scissors, you can easily cope with one hand, however, with large volumes of fragmentation of the material, fatigue of the muscles of the hand, forearm and shoulder rapidly increase. Buying a tool involves the design of an annual guarantee that is valid only with the competent use of scissors.

The battery pipeline is an automatic tool for superbust (a maximum of 7.0 seconds), neat cutting of propylene pipes, medium thickness (8.0–29.5 cm). Compressive power of cutting surfaces provides a small, powerful electric motor.

Roller pipeline. convenient to work modification of the cutting polypropylers of the tool. Despite the uncomplicity of its design, the employee can perform an absolutely even cut. In this case, cutting of pipe elements is carried out at an even (90 degrees) angle.

Attention! Any retreat in the process of cutting from an even, right angle (90 degrees) can provoke a breakdown of the tool or deformation damage to the lines of the cutting!

Roller pipeline instruments are with telescopic elongation. Such tools are equipped with a ratchet and, in general, resemble ordinary scissors. This pipeline has, on the one hand, the C-Formen Walking, where the trimmed pipe is placed. The opposite side contains an acute cutting blade. It after closing the handles with a brush cuts off the pipe in a flat plane.

Guillotine pipeline device used to cut large diametral pipes (63.5–350.0 mm). The tool is characterized by the presence in the design of a high.strength, sharply bidden blade covered with Teflon. A flat installation of the pipe, as well as unhurried cutting with very sharp blades contribute to the maximum smoothness of the end surfaces. This greatly facilitates the implementation of subsequent electric welding without additional processing of pipe ends.