Exhaust ventilation through the wall to the street: exhaust valve

Most of the new materials and finished structures, introduced into the sphere of construction and finishing, almost completely exclude the free movement of air. The tightness provided by them along with the pluses brought a weighty minus - a violation of ventilation processes.

They just need to be restored, because, you see, it is impossible to live in it without regular supply of fresh air to the room!

We know how to solve such a difficult problem: exhaust ventilation through the wall to the street will form the normal movement of air masses. A small wall unit will ensure the removal of the waste stream and excellent air exchange.

Our proposed article will introduce the subtleties of valve selection for exhaust ventilation, with the rules of its installation and operation. The information submitted for consideration is confirmed by photo materials, diagrams and video instructions.

The content of the article:

  • Typical ventilation problems
  • Types of exhaust valves
  • The design of the wall device
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  • Reasonable choice of a suitable option.
  • Subtleties of exhaust ventilation in the wall
  • Conclusions and useful video on the topic

Typical ventilation problems

Natural ventilation of residential premises is based on the presence of micro gaps characteristic of wooden window constructions. Through such small openings, the air regularly entered from outside and was removed from the house through the ventilation ducts arranged in the building construction.

So in the apartment was carried out a constant change of air masses, contributing to the normal level of humidity, removal of unpleasant odors, etc.

Regular air mass updates

Regular renewal of air mass, occurring naturally through a loose fit of window sashes and door panels, as well as by airing, it forms an optimal microclimate for vital activity, removes excess moisture, carbon dioxide and other harmful toxic substances

Improper ventilation in the house - the problem is almost inevitable when carrying out measures to reduce heat loss. Installing new windows and doors, trying to minimize heat loss, few people think about ventilating their homes.

But soon the problems manifest themselves in the form of a stuffy atmosphere, mold multiplication in the bathroom and other similar phenomena. Soon the abnormal microclimate begins to negatively affect the health of those who live in such a house.

Ventilation air handling units different types and types help to deal with excessive sealing of the premises, but for normal ventilation this may not be enough.

The thrust of natural exhaust ventilation is often weak, if not missing. Due to problems with the device ventilation structures of the air masses, which must be removed from the house, penetrates back.

Dampness in the room due to lack of ventilation

Lack of ventilation or improper organization of it is dangerous not only for the life of people. Moisture that condenses on surfaces and is not eliminated as a result of ventilation causes premature failure of structures, communications, and finishing.

On the state of thrust in the ventilation system of the house or apartments the temperature of the air outside is also reflected, or rather, the difference in temperature inside and outside the room.

In winter, this gap is quite large, which provides good traction. But in the summer period, the temperature difference between the outside and the inside air is not so significant, and this does not affect the quality of the draft too well.

For these reasons, you need to think about the need to install special exhaust valves. They will ensure quick and effective removal of exhaust air from the home, as well as prevent its re-entry.

Consequences of a wet environment

Stagnant stale air and excessively humid environment contribute to the resettlement of fungal colonies that threaten living with serious diseases and the destruction of building materials (+)

Types of exhaust valves

The low efficiency of exhaust ventilation is most often due to various reasons, for example, violation of the patency of the channels or their tightness.

In high-rise buildings, such situations often arise due to flaws during repairs, and eliminate the consequences errors and restore the normal state of the ventilation passages is not always possible.

Installation of exhaust fan

Depending on the installation site of exhaust ventilation, use a horizontal or vertical model of the valve and a fan with a sufficiently high performance (+)

In this case, exhaust valves may be more than appropriate. The design of these devices is very simple, their main purpose is to let the air flow outside and not allow them to penetrate back. According to the type of installation, these valves are divided into horizontal and vertical, it all depends on the direction of air flow.

If the exhaust flow should move vertically, choose a valve with a horizontal installation. And for venting air horizontally you need a vertical valve. Typically, exhaust valve models are completed fan. They are used where the removal of air from the room should be forced.

Another important point - the noise level, which produces a working device. The lower the sound effects from the pop-up blades of the valve and / or the rotating fan, the better. A lot of useful information can be found in the technical passport of the product.

Exhaust ventilation in the wall

When choosing an exhaust valve that will be installed in the wall, you should consider the thickness of this wall, as well as the material in which you have to make a hole

The design of the wall device

A conventional exhaust valve consists of three main parts:

  • flange;
  • dampers;
  • decorative lattice.

The round flange is a connecting element that allows the valve to be connected to the ventilation duct. The grille is a decorative element that simply masks a hole in the wall and also prevents large debris from accidentally getting inside. The basis of the design - flap.

This is a movable petal, round or square configuration, mounted on the axis. It can only open in one direction, ensuring the correct movement of the air flow. The design may also include a plumb line, which allows the valve to remain in the closed state if the fan is off.

Exhaust valve device

Axial exhaust fan consists of such elements as power supply cable (1), air intake grille (2), switch (3), switch cable (4), impeller (5), louver (6)

For industrial facilities, it is usually recommended to choose a valve with good explosion-proof characteristics, but for residential premises other features matter. For example, the presence of a rubber gasket that helps reduce the amount of noise will be helpful.

One of the common variants of the exhaust valve is a butterfly-type design. It consists of two blades fixed on the central axis. Another popular design of such devices is called petal, it includes a number of parallel-mounted blades that move according to the principle of blinds.

The installation of an axial fan for exhaust type ventilation is carried out according to a single scheme for all systems:

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Step 1: Purchase an exhaust fan

For mechanical exhaust ventilation, an axial fan is required, which will create a vacuum for fresh air to enter the room.

Step 2: Power Line to Device

A fan is a volatile device; it requires electricity. Therefore, to the place of connection we bring a line from the lighting branch

Step 3: Mark the points for fixing the instrument case

Attaching the lower part of the fan casing to the wall, checking its horizontal position and vertical level, mark the attachment points

Step 4: Drill the holes for the dowels fasteners

At the marked points we drill holes for installing dowels and install them

Step 5: Fixing the bottom of the fan casing

Fix the lower part of the fan casing on the wall, tightening the screws in the dowels

Step 6: Connect the fan to the wiring

To connect the fan in advance, we clean 1 - 1.5 cm of wiring, connect and lay the wires in the dedicated socket for them

Step 7: Installing the protective and decorative panel

Checking the fan action after connecting it to the wiring, we close the device with an external decorative protective panel.

Ceiling fan installation option

If the exhaust fan is installed in a private house on the ceiling, the actions are performed in the same order

Step 1: Purchase an exhaust fan

Step 1: Purchase an exhaust fan

Step 2: Power Line to Device

Step 2: Power Line to Device

Step 3: Mark the points for fixing the instrument case

Step 3: Mark the points for fixing the instrument case

Step 4: Drill the holes for the dowels fasteners

Step 4: Drill the holes for the dowels fasteners

Step 5: Fixing the bottom of the fan casing

Step 5: Fixing the bottom of the fan casing

Step 6: Connect the fan to the wiring

Step 6: Connect the fan to the wiring

Step 7: Installing the protective and decorative panel

Step 7: Installing the protective and decorative panel

Ceiling fan installation option

Ceiling fan installation option

Such a fan is often mounted in bathrooms, bathrooms.

Reasonable choice of a suitable option.

Most often, exhaust ventilation valves in the wall are made of metal or durable plastic. For conditions of high temperature and humidity, for example, for a bath, plastic products are not suitable, but they have proven themselves in less difficult situations.

Selecting the valve, you should consider its cross section: rectangular or round.

The most important indicator is the air flow rate for which the device is designed. The most common are models designed for a flow of 4-6 m / s.

Exhaust fan

For the organization of forced exhaust ventilation in an apartment or house, you can use a structure consisting of a fan and a check valve

If the valve is selected for a natural ventilation system, it is very important that the valve flap elements react sensitively even to small air flows. But for systems with a weak burden, the presence of an exhaust fan is obligatory, therefore such sensitivity is not needed.

But here it is important to choose a fan that is suitable for power, depending on the volume of the room for which the device is selected. So, for the kitchen, the fan power is calculated using a multiplying factor of ten, and for a bathroom this figure can be seven units.

In multi-storey buildings, the exhaust ventilation pipe must be brought one meter above the roof so that unpleasant odors do not penetrate from the lower floors to the upper ones.

Subtleties of exhaust ventilation in the wall

In private houses and even in high-rise buildings, in many cases it is more convenient to make a vent exit right through the wall. For this purpose, models of exhaust valves with a fan are used, which are inserted into the mounting coupling intended for their location.

You can also use overhead models of fans that are mounted on the inside of the wall.

Installing an exhaust fan

To install an exhaust vent valve in the wall, you must first make a markup and drill a hole of the required size in it.

To install such a simple structure, you need to make a sufficiently large hole for installing ventilation in the outer wall of the house. But first you need to select the appropriate device.

Models with manual control have a reasonable price, but they are extremely inconvenient in operation, since you have to constantly remember to turn on or turn off the exhaust valve.

Assembly of exhaust valve

The exhaust fan is installed on the inside of the hole made in the wall, and the check valve and the protective grill are installed on the outside.

To automate the process, you can use a timer. You will need to select a time schedule, in accordance with these settings, the valve will turn on and off at a specified time. It may be more effective to use a sensor that responds to the level of humidity in the room.

In this case, the device will start to work when the air in the room becomes too humid, and if the humidity decreases, the fan will stop. When choosing automatic control devices, you should make sure that the settings that were previously set are retained when the power is turned off.

To ensure good ventilation in the room, you need to use a sufficiently powerful fan. Weak in this respect, the unit simply can not cope with the movement of a large volume of air masses, as a result, ventilation will not be sufficiently effective.

Installation scheme of wall ventilation valve

The choice of location for the installation of a wall ventilation valve is focused on the requirements specified in the instructions by the device manufacturer.

When calculating, they usually use a simple formula:

M = O * B


  • M - required fan power;
  • O is the volume of the room in which the device will be installed;
  • B - the increasing air exchange coefficient.

Calculate the volume of the room, as is known from the school course of mathematics, as the product of the area and the height of the room. The air exchange coefficient is determined depending on the purpose of the room.

This indicator should be:

  • for a separate toilet - 8;
  • for the kitchen - 15;
  • for a bathroom or combined bathroom - 20.

It remains only to determine the volume of the room and multiply it by the appropriate factor in order to get an indicator that will help you choose a valve with a sufficiently powerful fan. It is not necessary to take an overly powerful model, it will only cause unnecessary costs and will not have a positive effect on the ventilation process.

When calculating the power of the exhaust fan, it is necessary to take into account the sensitivity of such equipment to the resistance of the system. The presence of a decorative grille and valve can reduce the speed of movement of the air flow in three to five and even ten times. Therefore you should not choose a device with a minimum size and power.

The fan capacity must be sufficient for exhaust air to escape from adjacent rooms through the valve, and not only from the room in which the device is installed. Before starting work on installing an exhaust valve with a fan, it is necessary to choose a suitable place.

Exhaust Hole

The hole for the exhaust valve is best done in the upper part of the outer wall, this position contributes to the effective discharge of exhaust air

To do this, use the wall, which is as far as possible from the place where the fresh air is taken. Usually, ventilation is installed in the walls or windows of rooms such as a bedroom or living room.

For exhaust ventilation is more suitable kitchen or a bathroom. As a result, unpleasant odors, excess water vapors, etc. are also removed with exhaust air.

Hole for exhaust valve to be done at the top of the wall. First perform the markup, then begin drilling. A hole of suitable size is made by a drill and a perforated ring drill. Sometimes you have to use a special tool with a diamond nozzle.

The opening for the exhaust valve must match the size and configuration of the fan. Usually this is a round device, but sometimes it is more convenient to use a device with a square case. In this case, the valve hole must be hollowed out using a perforator with a nozzle in the form of a blade.

Exhaust Hole

The diameter and shape of the hole in the wall for the installation of the exhaust valve must comply with the characteristics of the fan that comes with the device

Such works are usually accompanied by a large amount of dust, from which even the use of an industrial vacuum cleaner does not save. It is necessary to cover the surface with a film or other suitable materials before starting drilling in order to protect them from contamination.

For drilling extra thick external walls of durable materials, you can use a core drilling machine. This is expensive equipment that is cheaper to rent than to buy. Specialized firms provide core drilling service at a relatively low price, which depends on the depth of drilling and the wall material.

Core drilling machine

For drilling thick walls when installing an exhaust valve of forced ventilation, you can rent a core drilling machine that can handle almost any material.

During operation of this equipment uses water cooling. At the same time, a device is used to collect waste material and water, but a part of it will still fall on the wall, this point should be taken into account before starting work.

After the hole is prepared and cleaned of dust, it is necessary to insert a coupling into it, it comes complete with a valve.

Now you need to note the mounting points of the fan. The device is fixed on the wall through the designated holes. Dowels-struts are most often used as fasteners. Usually there is a small gap between the coupling and the wall, through which air can later penetrate.

All such slots are gently blown with mounting foam, which will provide the necessary tightness to the structure. After that, you can start installing the exhaust valve. Care should be taken not to damage the valve itself during installation and to prevent construction debris from entering it.

After installation, you need to make sure that the valve flaps move freely, do not stick. After that, on the outer side of the wall of the house you need to install a decorative lattice that closes the hole and gives the design an aesthetic look.

To improve the efficiency of the exhaust valve and reduce the likelihood of its freezing in the winter, it is recommended to lay a layer of insulating material around the coupling. This point should be taken into account when calculating the diameter of the hole under the exhaust valve.

Some masters consider the clutch, which is equipped with exhaust valve, not strong enough. They note that if necessary, the coupling may be accidentally damaged, and recommend replacing it with a segment of a more durable plastic pipe of the appropriate diameter.

Installing an exhaust fan

The design of exhaust ventilation must be airtight, so after installing the main elements of the device gap it is necessary to blow the mounting foam

If such a pipe turns out to be a little wider than the fan that is inserted into it, you can make a winding of electrical tape or other suitable material so that the device fits tight enough.

The inside of the fan should be powered. The cable is led to the electrical panel, when connected for safety reasons, they use fusible fuses.

When installing the exhaust valve in the toilet, bathroom power can be connected so that the fan is turned on simultaneously with lighting. In this case, the timer can be set to turn off after a certain period of time after the light is turned off.

In order for exhaust ventilation in the toilet and bathroom to work efficiently, it is necessary to ensure the flow of air into these rooms. Usually for this purpose special ventilation grilles are installed at the bottom of the door.

Fan mounting

The exhaust fan is fixed on the wall with the help of dowels, which are included in the kit, and then covered with a special grille.

During operation of the exhaust valve should be dealt with such a problem as the occurrence of blockages. If debris enters the device, it may damage the valve and impede fan operation.

If this happens, the device will have to be dismantled, decontaminated and installed again. Butterfly valves can be covered with a layer of ice in winter, which also leads to problems in the mechanism.

Conclusions and useful video on the topic

The process of mounting the fan and the check valve through the wall is described in detail in this video:

It demonstrated the operation of a high-power exhaust fan with a check valve. The device has high durability and low noise level during operation:

Exhaust ventilation is a necessary element for normal air exchange in the house. If it is installed correctly, then normal humidity and a microclimate favorable for people's health will be maintained in residential premises.

Have experience in the installation of wall ventilation channel? Or have questions on the topic? Please share your opinion and leave comments. Feedback form is located below.

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