Do I need a check valve in the fan. Check valve for ventilation

Supply and exhaust ventilation must perform its functions at any time of the year and in any weather, that is, to ensure sufficient supply of clean air and removal of waste air. An important role in effective air exchange is played by the ventilation check valve. Such a device is often used in natural and forced ventilation systems.

Reasons for reverse thrust

Sometimes it is impossible to ventilate the room due to the return of air from the ventilation duct with an admixture of all kinds of odors. This happens when the balance of the volume of incoming and outgoing air is imbalanced due to clogging or narrowing of the general ventilation channel. And also, due to the installation of high-power fans in other apartments, the exhaust air does not have time to be discharged outside and returns from other rooms. More often the upper floors are exposed to this. Since the channels of the kitchen and the bathroom are connected, the fan installed in your apartment in the bathroom will provoke a back draft towards the kitchen.

Reverse thrust problem

In the houses of old buildings, shafts were designed, designed for a lower air flow capacity and cannot cope with large volumes from modern powerful hoods. The ventilation check valve helps to organize an air exchange acceptable for the room. It helps to change the amount of exhaust air and let it pass only unidirectionally, blocking the movement back. Thanks to him, all kinds of odors from adjacent apartments do not get into the house, and dust, fluff and insects do not fly from the street.

Principle of operation and internal structure

The purpose of the check valve is to regulate and be a damper against the reverse air flow. The principle of operation of the check valve is as follows: the flaps, hanging on a central or several parallel axes, rise under the pressure of the air flow in only one direction, and when there is a calm, the petals (lamellas) fall under their own weight or with the help of springs, preventing reverse movement.

In addition to stopping the reverse flow, the valve also has the function of regulating the volume of the conducted air, when the cross-section of the duct is changed by turning the damper by a certain angle. Devices are two-position, where only two positions are "open" - "closed" and multi-position, when they can be adjusted to change the throughput.

Varieties and types

Consider the technical characteristics and types of check valves in several categories:

Based on the shape, three types can be distinguished: round; rectangular or square.
The dimensions are used that are suitable for the specific duct. In everyday life, for a house, apartment, bathroom, bathroom, they use round valves with a diameter of 100-125 mm, for ventilation in factories they are suitable with a diameter of 125 mm to 1000 mm. The length of rectangular valves ranges from 7mm to 72mm, and the width (height) ranges from 100mm to 1000mm.
The material of manufacture can be metal (galvanized steel, aluminum alloy) or plastic. Plastic products are more common, as they make less noise when opening and closing the blades. Due to their lightness, they are more used in everyday life, where the air pressure is not very high. Metal structures are typical of industrial models. They are heavier than plastic ones and close under their own weight. They are more reliable and resistant to aggressive environments, and belong to the explosion-proof category. But there are also disadvantages: metal corrodes, and condensation collects on galvanized dampers.
The mounting method is horizontal and vertical. It is installed in one way or another based on the technical data of the valve and the corresponding design of the supply or exhaust ventilation duct.
The controls can be manual or electric. A manually operated valve is manually adjusted by a lever or slide valve, and in round ones - by a valve. Such devices are used in natural supply or exhaust ventilation. The electric valve is used in a scheme with mechanical devices (fans, hoods) and automatically controls the volume of the passing air flow (damper position sensors).
All types of valves can be divided into two groups: heated (with an electric drive) and without heating. The advantage of the heated valve is that it does not freeze up in cold weather and does not accumulate condensate. Without heating, it is only suitable for use inside the house of the duct.
According to the type of construction, there are such varieties: membrane; petal; butterfly; lattice.

Check valve application

Natural ventilation

Suitable for both supply and exhaust ventilation. A supply ventilation valve is installed in the outer wall of houses, equipped with a check valve or damper. It can be equipped with an air filter. The use of a supply valve in natural ventilation provides good access to clean air in the dwelling with protection against backdraft and heat retention. A valve or damper allows you to adjust the intensity of the air flow.

It also makes sense to install a grill with movable shutters on the supply air ducts. They direct the air flow only inside the room.

The use of a flexible membrane in the ventilation grill in the kitchen is simply necessary, where a powerful flow from the hood and other rooms is discharged into one shaft to prevent its return. The membrane structure simply has to be very sensitive to the slightest air movements, since there is no high pressure with natural air exchange.

In natural ventilation, a two-leaf valve with springs, which requires high pressure to open, cannot be used. In this system, a device with a single blade works more efficiently.

Application in the case of a forced system

Such a device is well combined with mechanical devices for the hood, for example, a kitchen hood. It is installed together with the hood.

In models where a hood with a check valve is included, it acts as a damper. When the hood is off, the flap closes the duct, preventing odors from entering the kitchen from the common duct. The air duct from the hood should not block the opening to the common ventilation shaft, leaving it for natural ventilation. In addition to the grill, a single-leaf valve or a fan with a valve can be installed.

In more powerful hoods, a butterfly valve is used. Such designs involve additional costs. The duct from the exhaust hood is led directly to the street through the outer wall, directing the exhaust air out. To prevent cold air from entering the house, an inertial grate is installed on the outside wall.

Inside a house or apartment, in order to organize the correct air circulation in all rooms, inertial grilles are installed in the interior walls, and more often in the doors. Such inertial grilles facilitate air movement from the rooms towards the kitchen, to the common ventilation duct, and not vice versa.

Tee with a non-return valve and its application

For high-quality air exchange, when installing air ducts, special tees are used, which allow you to competently combine natural and forced ventilation.

Due to ineffective ventilation in the bathroom and toilet, stagnation of dampness and the formation of mold are often observed. To prevent the ingress of third-party odors, as well as to quickly remove moisture, an exhaust hood combined with a check valve serves. But the fan power should not be large so that the central ventilation duct has time to cope with the air flow.

It should be remembered that all shut-off and control devices must be cleaned regularly to maintain their functionality.

How to choose a finished product

The main problem with ventilation is poor draft. It is enhanced by combining all types of ventilation using a non-return valve.

When choosing a check valve, it is necessary to take into account the compatibility of all devices and mechanisms for the following factors:

The shape and diameter of the channel section. Choose the correct valve and fan for your duct so that there are no problems during installation. There are many valve models available in a variety of round and square shapes and sizes. Usually, air ducts and check valves with a size of 100 mm are used in everyday life. Square valves have proven themselves and are easily mounted in square shafts.
The material from which the product is made must correspond to the type of system so as not to impair its functioning. Indeed, in natural ventilation, the gates must respond to the slightest vibration in the air, which means they must be made of the finest material. And in industrial hoods, devices must be resistant to aggressive environments and temperatures, so galvanized steel or aluminum is used here.
Purpose and device. Consider for which room the valve is being selected. It must correspond to the power of the applied fan, so that it is enough to open the petals. For example, if a factor of 7 is enough for a bathroom, then for a kitchen - 10. There are ready-made models complete with a fan with a valve.
It is important to consider the flow capacity of the check valve. In everyday life, products with a throughput of 4-6 m / s are used. The volume of air removed from the apartment should not exceed the passability of the common ventilation shaft, otherwise it will be distributed to other apartments. Otherwise, it is necessary to install a separate air duct with an outlet to the street.
Due to climatic conditions, some devices are mounted only indoors, as they cannot stand low temperatures. For example, a butterfly will be covered with ice faster from frost. For a private house, it is necessary to take care of the characteristic blowing by the wind and the penetration of rodents.
Correctly selected valve serves as a guarantee of high-quality operation of your ventilation and comfortable living conditions.

DIY placement and installation rules

Initially, we determine the installation locations of the check valves in the ventilation circuit. Let's consider an example of installation in a ventilation shaft behind a fan.

Disconnect the hood from the power supply and dismantle it.
Insert the valve into the opening of the air duct and mark the attachment points on it. We take it out and drill through the marked holes.
We again insert the device into the channel and similarly make markings on the wall, then, removing the valve, we drill holes in the concrete opening using a bolt.
We hammer the dowels into the concrete and fasten the device.
Carefully seal the gaps at the edges with silicone sealant to prevent air leakage and weakening the flow rate.
Finally, we put the hood back in place.

Recently, check valves have appeared in the assortment, which can be installed in front of the fan - overhead. Their fastening is not so troublesome - it does not require dismantling the fan. A grille with a non-return valve is installed in front of the entrance to the ventilation duct or at the exit from it. It can be easily installed with your own hands by attaching it to the ventilation opening using self-tapping screws or "liquid" nails.

At the outlet of the ventilation shaft, a single-leaf gravitational valve and a double-leaf valve with the use of springs in conjunction with a powerful fan are used.

DIY creation

For natural ventilation, it is not difficult to make a valve yourself.
Work progress:

Output

All sorts of odors will not penetrate into the home if a check valve is installed on the ventilation. The simplest device allows you to organize high-quality and efficient ventilation of premises, maintaining a favorable microclimate in them.

Are the cooking smells coming back again instead of leaving the room forever? Agree, this is an extremely unpleasant situation that you want to get rid of as soon as possible. Most likely the problem lies in the occurrence of reverse thrust. This is a common occurrence and has many negative consequences.

We can help you get rid of unwanted aromas with a simple and inexpensive tool. It will not require redevelopment of existing ventilation ducts or significant financial investments. It will be enough to install a check valve for ventilation, which will solve the problem.

For an optimal result, it is necessary to know the design options for the valves, their pros and cons, as well as the rules for placement and installation in exhaust systems. All information is given in our article. It also contains useful videos with step-by-step installation instructions and photos that demonstrate the essence of the material presented.

In order to decide on the installation of a check valve, it is necessary to find out the possibility of reverse draft in the ventilation system of the house. Understanding this process will allow you to properly plan and implement indoor air exchange.

The ventilation system of the room is designed to provide fresh air, while removing waste, unpleasant odors and dust. It often happens that they cannot cope with their tasks, and instead of clean air they get into the apartment. To prevent this from happening, it is recommended to install a non-return valve for ventilation.

What is a check valve for?

A check valve is a design in which the blades of the valve itself, located on the axis, will move in such a way that the air entering the valve will not enter the apartment. Air masses in the check valve move in only one direction, and if it changes abruptly, the device closes, which prevents air from entering the room.

The main reasons for installing a check valve are:

Lack of supply ventilation - it can be broken or clogged, and therefore the supply air simply does not enter the ventilation.
Incorrect location of the exhaust pipe, as a result of the ingress of blown air into the ventilation.
Stove heating is installed in the house, and during the operation of the stove, the combustion draft increases in the chimney, which contributes to the return flow of air in the ventilation pipe.
A powerful hood is installed in one of the apartments of a multi-storey building, and during its operation, the air flow in other apartments is disrupted.
The presence of several hoods in one apartment will increase traction in one of them, which will lead to a violation of the outflow of air.

You can use a candle to check for draft in ventilation. Bring the lighted candle in the ventilation and open the window. If the air flow is correct, then the candle will go out.

Types of check valves for ventilation

Valves for ventilation can be classified according to the material of manufacture, most often they are made from:

Plastic.
Fine galvanized steel.
Combined materials - steel and plastic.

The version made of plastic is often installed in apartments, offices, cottages. These check valves have an attractive appearance and will suit any interior style. In addition, plastic valves can easily cope with natural ventilation tasks. Another undoubted advantage of them is their availability - plastic check valves are the cheapest devices among other analogues.

Models made of galvanized steel are used in industrial plants or in office buildings for household purposes. These valves have a robust design that allows them to function in supply and exhaust ventilation systems. In addition, enterprises always put forward increased requirements for fire safety, and steel valves do a good job with this task.

In buildings where natural ventilation is present, devices made of combined materials have proven themselves well. The body of the product is made of galvanized steel and the blades are made of plastic. In this way, the valve reacts at the smallest breeze and ensures natural air exchange.

Depending on the design, ventilation check valves are:

Petal. They are made in the form of a rigid damper, fixed on an axle, and contain the principle of operation of the rotary mechanism. With the flow of air masses, this damper rotates, thus closing or opening the air inlet.
With gravity grid. Outwardly, they resemble blinds located vertically or horizontally. When the hood is turned on, the flaps open and begin their work. This type is installed in walls to protect communications.
Membrane. They work on the principle of petal valves, however, the damper in such devices is much thinner, and when the wind blows, the membrane closes the grill, thereby preventing air from entering.
Butterfly Similar in structure to the petal-type valve, however, it has two petals on the axis, which resembles the famous insect. When the ventilation is turned on, the petals open and, accordingly, when turned off, they close.

In addition, valves are of horizontal and vertical type, with or without heating, as well as rectangular or round.

How to choose the right check valve

When choosing a check valve for your apartment, you must be guided by the following criteria:

The appliance must be sensitive to even small air movements, therefore it is better to install an exhaust fan with a grill. This will contribute to normal air exchange and increased traction.
The technical parameters of the valve must correspond to the purchased fan: the power of the latter must ensure full opening of the valve petals. Select the valve diameter to match the exact size of the fan.
Pay attention to the operating temperature of the valve - some devices can only operate at medium temperatures.
Depending on the shape of the duct, a suitable check valve with the same shape is selected. This is done for the convenience of installing the device.

Do not forget that if the valve is incorrectly selected, air exchange in the apartment can be disrupted and completely change its direction.

When installing the valve in ventilation yourself, it is important to remember the direction of the air masses. If this issue is resolved, then you can proceed to the direct installation of the device.

To do this, insert the valve body into the ventilation duct and mark the holes for future fasteners. After that, drill holes at the designated points using a screwdriver or drill. It is also necessary to make holes for fastening in the ventilation.

Next, insert the dowels and fix the non-return valve in the ventilation with a screwdriver. It is important to pay attention to the gaps between the valve and the ventilation: if they are too wide, they must be covered with silicone to ensure tightness. If this is not done, then the device will not be able to perform the intended function.

How to make a check valve with your own hands

Having figured out the principle of the check valve, you can easily make it yourself at home. The simplest will be a membrane-acting valve. It will require a ready-made lattice, a polymer film of medium thickness, adhesive sealant, fasteners.

The manufacturing process consists of the sequential execution of the algorithm of actions:

Measure the dimensions of the ventilation opening and cut the grille so that its dimensions are 2 cm larger than the ventilation outlet itself.
If there is a piece of plastic for the workpiece, then use a file to make the grid.
The surface of the grid must be smooth so that the membranes fit snugly against it.
Attach two squares of 0.5 mm thick foil on both sides of the grate. It is better to do this with a sealant.
Drill holes in the grille for wall fixing.
Place the grill in the vent and secure.

A self-made device will be able to work both with a natural ventilation system and with forced air circulation.

If there are problems with ventilation, it is still recommended to install a non-return valve, thus ensuring comfort and the absence of unpleasant odors in the apartment.

Each private or multi-apartment building has a system. The most important function of ventilation is to constantly circulate and supply fresh air, while at the same time removing dust deposits and odors.

Sometimes it happens that instead of a stream of air, a stench comes from the neighbors.

Here you understand that a reverse-acting valve for ventilation devices is a must. In this article, we will consider all the details of the check valve topic.

Valve structure

The axle with blades is the key content of this part. The curtain, under a certain influence of air, passes it only in a certain direction.

In the event of a cessation of air flow, the blades are closed. The valve itself regulates both the flow of air masses and the volume of clean air.

Why do you need a check valve

When developing , be it or, we recommend that you analyze a number of reasons why a check valve should be installed in your room.

Violation of the technology of the location of the exhaust pipes leads to the fact that blown air flows begin to enter.
If there are several hoods in the dwelling. This leads to increased outflow, due to increased traction in one of the hoods.
If we are considering an apartment building, then there is a possibility of the presence of at least one powerful hood, and when it works, the air flows shift, which leads to the appearance of reverse draft in other apartments.
Lack of fresh air supply. This usually happens in the event of a breakdown or clogging.
The presence of heating, due to the stove. In this case, during the operation of the stove, the combustion thrust in the pipe increases, and this, in turn, leads to a reverse flow in the pipe.

How to check ventilation draft

The key question.

It's simple:

The plug should go out if the air flow is correct.

It should also be noted that it is better to provide for the installation of a check valve on and installation. Since its price is insignificant, as well as during the operation of ventilation, clogging, deformation and environmental influences are possible, which in turn will lead to a change in the air flow in the ventilation itself.

That's when you have to buy a valve, take the time and embed it into a working system.

The main classification of check valves for ventilation

Based on materials

Plastic (plastic). These are some of the cheapest and most commercial devices. They are often used in office buildings, houses, cottages. They look very attractive, and thanks to the rich color palette of the material, any design can be realized.

Cink Steel... They are widely used in industry and administrative buildings. These models are very durable, this allows them to cope with their task for a long time and with high quality. Valves made of steel do not have such a disadvantage as fire safety, since steel does not burn, unlike plastic.

Combination of materials... The body of the device is made of zinc-plated steel, and the shutter or blades are made of plastic. It is widely used in rooms with natural ventilation. This valve reacts even to small wind movements, providing a high-quality and natural exchange of air.

By form

Round.
Rectangular.

It all depends, of course, on the shape of the duct. It should be noted that for round valves intended for household use they are produced with a diameter of 100 - 200 mm. - these are the most common sizes. And for industrial systems it is possible to issue 150 - 1000 mm.

Moreover, for everyday life there are mainly round valves, and for industry, rectangular ones.

From installation method

Vertically arranged.
Horizontally located.

By regulation method

Manual - using latches and levers.
Automatic - occurs automatically, since it is a complex of supply and exhaust ventilation devices that function as a whole.

By design

Now let's look at the most important classification.

Petal valve

The valve is one-leaf gravitational action. Air, moving from the room, acts on the leaf, fixed on the axis of the valve body. Under the action of this force, the sash opens. In the event of a reverse thrust, the sash will close on its own under the force of gravity.

The presence of one sash makes the design simple and reliable.

When installing this type of valves, a level should be used, since it should only be mounted in a vertical or horizontal position.

This design has two versions:

Models where the axis is offset from the center. And usually it is located in the middle.
Use of counterweights that are located on the outside or inside of the device.

Butterfly valve or double-leaf valve using springs

In structure, it is similar to a petal valve, only it has two petals located on the same axis. Hence the resemblance to an insect, from which it got its name.

They are usually used in forced ventilation systems.

That is, when the ventilation is turned on, the blades open, and when turned off, they close with the installed springs. Such a device can even be positioned at an angle. Check the sensitivity of the curtains before purchasing. Recently, the sensitivity adjustment is done according to the force of the compression of the springs.

Gravity grid valve

In appearance, they resemble blinds, which can be positioned both vertically and horizontally. When you turn on the ventilation, the air opens and begins to flow, as soon as you turn it off, the blinds close.

Most often placed in walls for protection. The main advantage of these types of valves is their use at subzero temperatures in outdoor conditions.

Flexible Diaphragm Valves

The principle of operation is also similar to that of a petal valve. A thin flexible plate is used only as a curtain, which, when closed, fits snugly around the perimeter.

They are placed mainly in rooms with natural ventilation, since the membrane is very sensitive. The disadvantage is the fact that the membrane will deform if there is excessive reverse thrust.

How to make a check valve for ventilation with your own hands?

It should be borne in mind that the cost of standard check valves is not high, and there is no point in making the valve yourself.

And if the ventilation boxes are non-standard, then you should think about how to make a check valve for ventilation with your own hands.

The simplest mechanism that you can make yourself is a petal or diaphragm valve.

Instead of a curtain, you should choose a rigid plate of metal or plastic. To prevent the passage of air flow, the curtain should fit as tightly as possible to the edges of the case. And also the curtain should be firmly fixed in order to exclude sounds and friction.

A grill should be installed on the ventilation hole so that the membrane does not deform. That's all the structure is ready for use.

How to install a non-return valve for ventilation?

First, you need to decide on the number of valves that we will install.

If the air intake system is simple

So, if you have the only place for air intake, and it enters the mine further, then back draft can be prevented with the help of one valve in this system.

If the air intake system is complex

If ventilation is complex and involves several ventilation openings, then a rule should be applied that regulates the number and location of non-return valves.

First, the valve is installed on any branch. which connects the air intake and the main line. This is necessary so that the air flows are not redirected towards the hood at the moment when it is turned off.
Second. The check valve should be installed at the outlet of the system. ventilation. Many will say that this should not be done during the complete sealing of the system, but as experience and practice shows, the presence of a valve in such places is mandatory.

The check valve should be installed in easily accessible places so that it can be quickly and conveniently serviced and cleaned.

Recently, manufacturers of fans and hoods have already provided check valves in their designs. As a result, the installation of additional valves is impractical.

Installation of a non-return valve from the street

simple, we buy a valve taking into account the shape and size of the hole, apply it and mark the places for drilling. We drill, apply and secure, having previously missed the edges of the valve.

It should be noted that for the streets, it is best to buy valves with metal elements. If suddenly ice forms on them, they can be easily cleaned mechanically, and the plastic is likely to break.

Indoor installation of a non-return valve

If you are installing a slip-on check valve in front of the indoor fan, the process is similar to the one described above.

And if you need to install a check valve inside the ventilation shaft, then you will need to dismantle the ventilation device.

We mount the non-return valve inside the ventilation chamber housing and markup the mountings.
Then we take out the case itself and drill holes in the marked places.
After that, we put the body in place and mark the holes on the brick or concrete walls of the well.
We drill holes in the concrete with a bolt.
After we install the dowels, and put the whole structure together, we carefully fasten everything, we look so that there are no gaps between the valve and the body.
If gaps are present, then they should be treated with silicone.
Then we install the fan.

Now you do not have to worry about the penetration of unwanted odors into your room.

Finally, I would like to say that at the moment there is a huge selection of models, shapes and sizes of check valves for ventilation on the market.

But it is worth remembering that you should buy from bona fide manufacturers and then you will receive a device with the appropriate properties and quality assurance.

Check valve selection rules

It should also be remembered that if you approach the selection of a check valve in bad faith, this can lead to poor air exchange.

And in order to prevent this from happening, you should follow a number of rules when choosing this device:

The dimensions of the check valve must match the dimensions of the fan. And the power of the fan should be enough to create a flow that will ensure the opening of the petals without any problems.
Some devices are for indoor use only. This should be taken into account when choosing a valve model.
The best combination is non-return valve + exhaust fan + ventilation grill. This combination will provide maximum air exchange efficiency.

As you can see, the ventilation check valve plays an important role in ensuring a comfortable climate in any room.

When using complex ventilation systems, it is important to correctly place check valves to block air return.

Then the combination of hoods and fans will work flawlessly. Indeed, the service life and the quality of ventilation as a whole depend on the correct installation of these devices.

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Modern technologies make our home more and more airtight. Reinforced plastic windows, laminated surfaces and suspended ceilings impede natural ventilation, which is why dampness and mold develop in houses. Households suddenly begin to suffer from allergies and frequent respiratory diseases - this is also a side effect of completely sealing the house. Stagnant air is replete with allergens, pathogenic bacteria and microorganisms actively multiply in it. That is why it is important to install a supply valve into the wall, which will provide access to outside air into the room and at the same time prevent drafts.

The supply valve is a simple device for ventilation

The main purpose of the supply unit is to provide fresh air access to the room. Under the condition of normal operation, the supply unit allows an average of up to thirty cubic meters of air per hour into the room, which corresponds to the physiological needs of one person.

The device consists of several elements:

Duct tube. Usually this part of the device is made of plastic.
Grille (metal or plastic) to protect the outside of the duct.
Internal insert with head and air filter.

Some devices are additionally equipped with a noise isolator and. These additional elements prevent the supply ventilation valve in the wall from freezing in severe frosts and block street noises.

The hygro control system automatically opens the valve if the room exceeds the standard humidity readings.

The supply and exhaust valve can also be additionally equipped with:

fan;
temperature sensors;
air recovery system;
remote control.

Advantages and disadvantages of a wall inlet valve

Like any device, the ventilator has its own undoubted advantages and disadvantages, which must be mentioned. First, about the good:

With the use of the device, the need for constant opening and closing of windows is significantly reduced. This saves time and saves the window mechanisms.
The device acts as a noise isolator and filters the air from toxic urban impurities.
The device has regulation functions, it can be adjusted to the needs of a particular home.
Installation of the ventilator in the area of operation of heating devices significantly saves heat loss.
The device has a small size, is practically invisible on the wall and does not interfere with the placement of furniture.
The device has a relatively low price, is easy to assemble and can be manufactured and installed on your own.

Useful information! Installing the supply unit in the area of the battery will lead to the fact that the cool air from the street will be heated by the heat of the radiator when it enters the room. The second option for installing the device is in the upper part of the wall, where the incoming air masses will mix with the heated air of the room.

Cons of using the device:

To install a ventilation valve, a hole must be made in the wall, that is, in some way, its integrity must be violated.
Incorrect installation of the device can cause freezing of the wall.
In northern regions, in winter, the ventilator can cause the room temperature to drop to uncomfortable values for humans.

Types of ventilators

Supply devices differ in the following parameters:

the presence of air flow control (mechanical or automatic);
the presence of a sound insulator and insulation;
the presence of additional elements;
the possibility of complete insulation of the duct;
in size and appearance.

Air exchanger selection

Before buying a wall-mounted supply valve, you need to check it for compliance with some important criteria:

The device should not be too cheap, a high-quality device equipped with the required number of functions costs at least a third of the average cost of a metal-plastic window.
The valve must be installed directly into the window frame or into the wall next to the window. It is important to check the possibility of such an installation.
It is necessary to decide on the type of ventilator control - mechanical or automatic. The automatic machine will greatly simplify the need to control the optimal temperature and humidity in the house.
Attention should be paid to the level of noise protection of the device.
The ability of the valve to withstand the temperature regime of the region.

Prices and popular models

Ventilation devices with a minimum set of functions are relatively inexpensive. The simplest model can be purchased for five hundred to eight hundred rubles. But the most effective are models in the price range of two to four thousand rubles.

Table 1. Average cost of inlet valves into the wall

Image / Model	Average price, rub	Incoming air volume, cubic meter per hour	Diameter, mm	additional characteristics
KIV 125	1600	36-60	133	Mosquito grill
Aereko	4200	5-40	100-125	Noise suppression
KPV-125	2450	54	125	Heat insulation
SVK V-75	2500	1,5-31	142	Heat insulation

supply valve KIV 125

Supply valve EHA2, 5-35 m3 / h, white, EAR201

Wall air damper KPV-125 - 500mm

supply valve SVK V-75

Features of air duct installation

Before installing the valve, you must decide on its location. The best place for this purpose is considered to be a place near a heating radiator on a load-bearing wall.

Step 1. Drilling a hole to install the air exchanger. The bore diameter should be slightly larger than the valve tube. This will allow the device to be correctly positioned and securely fixed in the wall.
Step 2. Outside on the wall in the area where the device is located, it is necessary to provide protection from rain. If it is not possible to do this (the valve outlet will be located in a place inaccessible for work), the hole must be made with a slight slope towards the street. This prevents raindrops from entering the appliance.
Step 3. Install the supply valve into the wall and fix it with construction foam.

How to make an inlet valve into the wall with your own hands

To make a simple device you will need:

The plastic pipe will be an air duct, the piece should correspond to the thickness of the wall (a small margin can be provided). The optimum tube diameter is 10 to 12 centimeters.

A grid is fixed on one side of the tube; this will be the outer part of the device.
A rolled-up insulation (mineral wool, expanded polystyrene) is inserted inside the tube. For this purpose, you can use pipe insulation. The thickness of the layer should be about two centimeters, this is enough to prevent freezing.
Next, a foam filter is inserted into the tube.
The last step is to install the valve. You can make it yourself or purchase a finished product at any ventilation equipment store.