Household exhaust fans for the bathroom. Exhaust fan in the bathroom. How to choose a bathroom fan

Maintaining the required level of comfort in the bathroom is a very important task. Constant humidity significantly reduces service life finishing materials, adversely affects appearance plumbing equipment and mirrors, contributes to the appearance of mold and other fungi, and this negatively affects human health. Will help solve all these problems bathroom hood. Exhaust fan happens in three designs: axial, centrifugal or radial.

Axial extractor hood in the bathroom it is equipped with simple impellers with an impeller and is usually made in a cylindrical body. In such a fan, the blades capture air flows and move them along the axis. Such fans are in demand due to their ease of installation and fairly high energy efficiency. Axial models are installed in the wall, directly into the hole in the ventilation shaft.

Centrifugal bathroom hood- a fairly recent invention. These devices combine simplicity of design and ease of use, as well as more power with low noise characteristics, thanks to which for its short story existence managed to gain incredible popularity. Installation of centrifugal fans is usually carried out in a flow-through ventilation system, under the ceiling. Such models can even be hidden behind plasterboard panels, which is especially important for rooms with high requirements to design.

Radial fans are an impeller placed in a spiral-shaped casing. Perhaps this type of hood is the quietest and most economical. In addition, radial fans are unpretentious in operating conditions and can easily cope with performance overloads.

On the pages of our online store, customers can familiarize themselves with models from leading manufacturers bathroom hoods. Price prices for fans vary widely, so buyers with any income can find suitable equipment here. For the convenience of visitors, the catalog is equipped with product filters, with which you can quickly select extractor hood for the bathroom. Buy the device is not difficult: just a few clicks, and you already own the fan, after which all you have to do is wait for the delivery of your purchase. Delivery is carried out within the city Moscow, as well as to the regions.

Ventilation in the house is as important as heating or water supply. The hood in the bathroom is an integral part of the ventilation system. This issue must be approached very carefully; there are no unimportant details here. In this article we will analyze the basics of ventilation, select correct fan for a bathroom hood and we will install it.

Types of ventilation

Why do you need ventilation in the bathroom?

A competent approach to installing a ventilation system in a house is the key to the health and quality of life of the family.

There is a misconception among popular opinions: a hood for a bathroom is not as important as for other rooms in the house. Most people don't even think about the importance of ventilation for the bathroom and toilet. Others suggest that the window is enough for optimal air exchange. Of course, these ideas are completely wrong.

A hood in the bathroom solves the problem of proper air exchange, therefore, there will be no unpleasant odors in the bathroom, and the air in the room will be fresh. This is especially true for a combined bathroom.

High humidity in the bathroom creates favorable conditions for the reproduction and growth of microorganisms. A properly functioning ventilation system will help defeat rot and mold. A hood in the bathroom helps achieve optimal temperature and humidity, as well as maintain parameters at the desired level.

A bathroom hood solves the following problems:

creates air exchange;

maintains microclimate.

Types of ventilation

There are two types of ventilation systems.

Natural exhaust in the bathroom is created by removing stale air through the ventilation shaft. This type of ventilation is laid down at the design and construction stage of houses. For the system to function effectively, an influx is necessary fresh air through special holes in the bathroom door.

Advice. In order to check how well the system works, you need to create a draft (open a door or window) and bring a sheet of paper to the ventilation grille - it should stick to it.

In cases where the ventilation hood for the bathroom does not work correctly or is not efficient enough, forced ventilation in the bathroom can correct the situation.

Forced exhaust hood in the bathroom is created through the use of special devices - fans.

In what cases is artificial ventilation necessary?

Artificial ventilation is necessary, if natural ventilation is working properly, if you notice:

rust on pipes or metal products;

condensation on walls, windows, objects;

signs of appearance (black dots) or pronounced rot, mold.

Forced ventilation installed in the bathroom in addition to natural ventilation significantly reduces the harmful effects high humidity. This has a beneficial effect on the condition and service life household appliances installed in the room. It will allow you to keep ceilings and walls in their original condition longer after repairs.

Fan classification

Bathroom fans are classified according to the following criteria:

according to the location of the working element: overhead or channel. Overhead bathroom fans are mounted at the entrance to the ventilation shaft. Their installation is simple and affordable. The main work of duct fans occurs inside the air ducts. Duct fans for the bathroom allow you to create a full-fledged ventilation system that unites several or all rooms in the house. The creation of such a system occurs during construction.
according to installation location: ceiling, wall, roof. Ceiling fans are usually duct fans, while wall fans are overhead fans. Roof fans represent a whole complex supply and exhaust ventilation, which is placed under the roof of the house;

according to the operating principle: bladed, centrifugal. Blade, in turn, are divided into axial and radial. The operating principle of blade fans is to remove exhaust air by rotating the blades or, in the case of a radial fan, by using blades. Centrifugal toilet and bathroom hoods work by creating centrifugal force inside a fan;
according to availability additional functions: check valve for ventilation, hygrometer, shutdown timer, motion sensor. The hygrometer allows you to automatically turn on the hood in the bathroom at a given humidity level. The timer sets the time when the hood is turned off. A motion sensor starts the fan when a person enters the bathroom;
by switching method: mechanical or automatic. Mechanical fans either have a separate power button or turn on along with the bathroom light. Automatic fans turn on at specified parameters, for example, when a person enters the room, the humidity exceeds valid value, the light sensor is activated.

A check valve for ventilation can be included with the fan or can be purchased separately.

The valve prevents air from penetrating back into the bathroom, which is important during the cold season. A plastic check valve for ventilation is required when channel system air duct so that odors from the kitchen or toilet do not penetrate into the bath.

How to choose the right fans for the toilet and bathroom

In order to choose a fan for the toilet and bathroom, you need to set the necessary parameters for its operation. Firstly, it is worth calculating the required hood performance. To do this, the volume of the room *(multiply) by the number of air changes. For a combined bathroom and toilet the value is 10, for a bathroom – 8. Further, if the number of people in the family is up to 3, * by 6, more than 3 – multiply by 8. It is recommended to buy bathroom fans with a performance reserve, i.e. slightly more powerful than the result obtained. Performance calculations must be made for the right choice fan Otherwise, installing a weak hood will not produce the desired effect, and installing an overly powerful one will lead to hypothermia in the room.

Noise indicator – important criterion when choosing a fan. During operation, the device creates two types of noise: due to moving blades or centrifugal force and due to vibration of the system. Noise of 35 - 40 dB begins to irritate nervous system person. To solve this problem it will be suitable silent fan for a bathroom - the volume of its operation is only 20-25 dB, for comparison this is the volume of a whisper.

The silent bathroom exhaust fan has a number of design features, due to which the noise level is reduced. First of all, this is the presence of vibration isolators and material of higher density, due to which the desired effect is achieved. The location of the fan and its type also affect the noise level. For example, a silent duct-type bathroom fan installed on the ceiling will create less noise due to the fact that its system is located inside the duct.

Advice. When choosing a fan, you should consider models designed for installation specifically in the bathroom.

They have increased safety indicators. The design provides protection from moisture and accidental splashes of water. In addition, they operate at reduced voltage. This characteristic plays an important role: if a short circuit occurs, a voltage of up to 25 volts will not lead to electric shock.

The toilet hood has a similar design to the bathroom hood. Distinctive Features is less power and fan diameter. If the average performance of a bathroom fan is 100 m³/h, then a toilet hood can operate with a power of 50 m³/h.

When purchasing a fan, you should consider the following characteristics:

performance indicator;
noise indicator;
safety indicator.

Installation of fans

Installation of a hood in the bathroom, depending on the complexity of the system, can be carried out on our own or with the help of professional workers. Duct ventilation is installed during the construction phase.

Blade fans are the easiest to install, which is why they have become more widespread. It is enough to place the device under the grille of the ventilation system, connect it to electricity, and hide the wires in an insulating box. Please note the following points during installation:

the hood for the toilet and bathroom is installed opposite the door, at the maximum height from the floor. Holes should be made in the bathroom door or a gap of 1.5-2 cm should be left from the floor;
installation of the hood is carried out only in a properly functioning ventilation shaft - only the grille is visible on the surface;
When installing ventilation in a private house, air must be vented outside, and not under the roof (for example, into the attic). Otherwise, condensation will form, which stimulates the development of rot. This is especially dangerous for wooden beams Houses;
a forced-air exhaust hood for the bathroom, which has a ventilation check valve, is the preferred choice;
can be used to reduce noise silicone sealant or silent fan models;
Fastening is best done using self-tapping screws.

Options for connecting a hood in the bathroom: video

To ensure that there is fresh and clean air in the bathroom and that mold does not form on the walls, it is necessary to ensure good ventilation. Natural ventilation systems do not always cope with the job; Exhaust fans for bathrooms and toilets will help solve the problem.

As a rule, natural ventilation systems are used in city apartments. However, due to the widespread use of double-glazed windows and the desire of some residents to “isolate” from neighbors by blocking ventilation ducts, the systems built during the construction of the house stop working.

Another reason for the ineffectiveness of natural ventilation is contamination of the ducts, as a result of which air simply cannot penetrate into the apartment.

An exhaust fan for the bathroom can be a solution to the problem. After all, it is in the bathroom, as well as in the kitchen and toilet area, that the flow of fresh air is especially important.

To check whether the natural ventilation system in the bathroom is working, you need to carry out a simple test.

To do this, take a piece of paper and apply it to the grill.

During normal operation of the system, the leaf will “stick” to the grille, that is, it will be held by the air current.

If the ventilation does not work well, the leaf will not be held.

However, you need to remember that even a properly functioning natural ventilation system does not always cope with the task assigned to it, since the principle of its operation is based on the difference in temperature indoors and outdoors.

For example, in the summer, when it is hot outside, ventilation practically does not work. Therefore, the Example of installing an exhaust fan is an excellent choice even if the house is new and the ventilation system is working properly.

Why do you need ventilation in the bathroom?

Typical bathrooms have a small area. When we take a bath or shower, the room is instantly filled with steam. In the absence of air exchange, dampness settles on the walls and ceiling, causing it to deteriorate, and disgusting black spots appear on the walls - mold.

As a rule, there is no window in the bathroom. Therefore, the only way for fresh air to enter is through ventilation systems.

When building a house, builders always plan a natural ventilation channel, but if it is not effective enough, then it is worth additionally installing an exhaust fan for bathrooms.

How to choose a fan?

When choosing an exhaust device, the following factors should be considered:

Number of people living in the apartment;
The area of the ventilated room.

In order to save energy, it is worth choosing models that provide the ability to regulate power and, if necessary, turn off the device.

After all, if there is no one in the apartment throughout the working day, there is no point in keeping the device on.

Bathroom fans that are equipped with a timer are very convenient. In this case, the device will only work certain time, for example, within 30 minutes after a person leaves the bathroom. Devices equipped with a humidity sensor are very convenient.

In this case, the system will start working automatically when a certain level of vapor content in the air is exceeded. Since water is constantly used in the bathroom, it is advisable to purchase a hood in a design that protects the device from splashes.

When installing ventilation in multi-storey building, which uses exhaust ducts common to several apartments, it is worth choosing bathroom fans with check valve.

The valve is necessary to prevent the reverse flow of air from the ventilation duct into the apartment. This device will protect the room from street dust, poplar fluff and other small debris.

In addition, a bathroom fan with a check valve will prevent odors from neighboring apartments from entering the ventilated room. After all, residents of high-rise buildings know firsthand that if one of the neighbors, for example, smokes in the bathroom, then in the apartments located higher up the riser the smell of tobacco can be felt.

As for choosing a fan brand, preference should be given to reputable manufacturers. For example, you should pay attention to vents bathroom fans.

The following options are available for models of this brand:

Household ones are designed for small areas;
Models can be installed with standard duct sizes;
You can choose devices for wall or ceiling mounting.
The body of the models is made of ABS plastic, characterized by high strength.
Fans work with low level noise.
It is possible to equip models with motion sensors, humidity sensors, and a timer.
The VENTS brand produces fans with a check valve for the bathroom.
The fans are equipped with convenient cord switches.
The fans are equipped with low voltage motors (12 volts), so their use is safe in rooms with humid air.

How to install the fan?

It is best to install bathroom exhaust fans during a major overhaul. But even if no repairs are planned, you can install the equipment without damaging the finish.
Power to ventilation device It is better to lead from the box to which the wires for the switch for lighting are connected.

If you are installing a device with manual activation, then it is convenient to install a double switch in the bathroom.

One key will work to turn on the light, and the second will work for ventilation.

The wires going to the fan can be hidden in grooves or under a suspended ceiling.
The easiest way is to install exhaust fans in the bathroom using a ready-made ventilation hole in the wall. To do this, a plastic ventilation pipe is inserted into the hood opening at wall level.
The pipe is strengthened with plaster, and a power wire is first connected to it.

If there is no ventilation pipe, you can replace it PVC pipe for sewerage with a diameter of 100 mm.

If the ceiling height allows, you can assemble more complex system using plastic ventilation ducts, placing the fan directly above the bathtub or, for example, above the toilet.
The fan should be connected according to the diagram in the instructions.
Installing the fan itself is easy. To do this, remove the top cover from the device. Lubricate the back of the case with glue (for example, liquid nails) and install the fan in place, pressing it against the wall or box for a few seconds.
The last stage is the installation of the ventilation grille. It is either screwed on with screws (included in the kit) or installed using latches.
It should be remembered that the ventilation grille should be periodically cleaned of dust. To do this, you can use a vacuum cleaner or simply rinse the plastic grill with water.

Conclusions:

Thus, using forced air exchange systems, you can quickly and effectively solve the problem of dampness in the bathroom. By installing modern sensor-equipped bathroom exhaust fans, you don't have to worry about energy efficiency since the unit will only work when needed.

Increased humidity in the bathroom has not been a secret for a long time. To ensure clean and fresh air in the room, you need to ensure good ventilation. People try to combat high humidity in a variety of ways. However, the time has passed when you need to open the doors to the room after taking a shower and remove the water from the floor. It's time to move on to drastic measures - buying a fan for the bathroom.

The importance of bathroom ventilation

Ventilation in the bathroom is important for human health. Typical bathrooms have a small area. Therefore, when taking a bath or shower, the room quickly fills with steam. Dampness settles on the ceiling and walls, causing the bathroom finish to deteriorate. Now think about whether you need a fan in the bathroom?

Splashes of water, condensation and vapors can lead to unwanted mold and mildew formation, resulting in unpleasant odor, the appearance of harmful small insects and their harmful secretions. Removing odors and moist air is essential for your comfort and reducing the risks of allergies and respiratory diseases.

As a rule, there is no window in the bathroom. And the only way to get fresh air into the bathroom are ventilation systems. When building a house, builders mandatory plan natural ventilation channels. The effectiveness of the ventilation system depends on the direction and location of the air flow.

Often, natural ventilation systems do not cope with their task. To check whether the natural ventilation system in the bathroom is working effectively, it is enough to carry out a small, simple test. Take a piece of paper and place it on the grill. It will stick to the grille if the system is working properly - it will be held by the air flow.

If the ventilation does not work well, the leaf will not be held. However, it should be remembered that even a normally operating system demonstrates low performance, since the principle of its operation is based on the difference in temperature in the bathroom and outside. In the summer, when it is hot outside, the ventilation hardly works.

Also, ventilation ducts become clogged over time, and the entire system loses efficiency. Remember, if in your home condensation accumulates on the surface of the walls, plumbing fixtures and furniture in the bathroom, the mirrors in the bathroom fog up and there is a constant presence in the toilet bad smell, you should install an exhaust fan in the bathroom.

Types of exhaust fans

When purchasing a fan for a bathroom, it is worth reading that such devices are structurally divided into duct and axial, radiator and roof, which is determined by the features of their application.

Axial fans

Axial bathroom exhaust fans are a wheel with cantilever blades located in a cylindrical housing. Impeller usually mounted on the axis of the electric motor. When the wheel rotates, air is captured by the blades and moves in the axial direction. There is practically no movement of the air mass in the radial direction.

A manifold is installed at the entrance to the bathroom hood to improve the aerodynamic characteristics of the fan. Axial models show a fairly high operating efficiency compared to other devices - productivity is more than 100 cubic meters per hour, but their pressure characteristics are low. They can be installed directly into the wall.

This type of bathroom exhaust fans is quite common due to its ease of installation. Mount wall fans into the ventilation shaft openings. In principle, such installation is a violation, because air circulation may be disrupted in general ventilation. The disadvantages of wall-mounted axial fans include more high level noise, which often reaches 30-50 dB.

Radial fans

Fans of this type consist of a blade wheel located in a spiral casing. When the wheel rotates, air enters the holes between the blades, follows to the periphery of the blade wheel in the radial direction, is compressed and thrown under the influence of centrifugal force into a special spiral casing and then enters the discharge hole.

The working hollow cylinder has blades along the side surface, which are located parallel to the axis of rotation at an equal distance. In air cooling and ventilation systems, the quietest radial bathroom fans are used, with single or double suction, with blades curved forward or backward.

Usage radial fans, the blades of which are directed backwards, allows you to save 20% of energy. Another important advantage is that they can easily withstand air flow overloads.

Bathroom exhaust fans with forward-curved blades can provide similar pressure and flow rates. technical specifications, as devices with backward-facing blades, with a smaller diameter of the impeller and a low frequency of its rotation, helping to achieve good result while creating less noise and taking up less space.

Centrifugal fans

Centrifugal duct-type fans appeared quite recently (70s), but gained great popularity due to their convenient use and considerable simplicity. Duct fans for the bathroom are used when the room area is more than 15 square meters.

The devices themselves are quite powerful, but the noise level is rated as low. Silent duct-type bathroom exhaust fans are designed to be placed in the flow part of the ventilation system. They come with rectangular or round. Typically, a duct fan is installed under the ceiling and hidden behind plasterboard panels.

It is advisable to choose semi-rigid or rigid air ducts, because their design is considered more reliable than flexible ones - this provides more long term services. Centrifugal fan Can be mounted in the middle of the duct or in front of the air intake opening.

Although the latter option is not very convenient, since it requires the installation of an anemostat, which prevents condensate from entering the ventilation system. However, in the first situation there are also disadvantages - due to the aerodynamic resistance of the air ducts, you need to install a more powerful fan.

Roof fans

Roof hoods are installed on the roofs of residential buildings. Roof-mounted fan units consist of a fan, an electric motor, vibration-isolating pads, as well as automatic control devices, all contained in one housing. These devices use axial multi-blade or radial devices with single or double suction blades.

Choosing a bathroom hood

When choosing a fan for the bathroom, you need to remember some parameters and technical characteristics, such as air exchange and performance, noise level and safety in a moisture-saturated environment, as well as the functionality of the devices and the price-quality ratio.

Performance

To calculate the required fan performance for your bathroom, you will need the following information: the volume of the room and the air exchange rate - the number of air changes per hour. The product of these two indicators will be the fan performance.

You can calculate the fan power using the following calculations. Calculate the volume of the room by multiplying the length of the room by its width and height, and rounding up. To obtain productivity, multiply the volume of the room by a number that shows how many times the air should be changed to fresh air in one hour.

The air exchange rate always depends on the type of room and is specified in building codes.
This number is for the bathroom building regulations is 6-8. Take 6 if 1 - 3 people use the bathroom in your house, if more than 3 - substitute or 8. The air exchange rate for the toilet will be 6-10.

After the calculations have been made and the performance obtained, you can choose the most best fan for the bathroom according to the parameters of various manufacturers that produce exhaust fans. Practice shows that it is necessary to take a fan that has technical indicators slightly higher than the calculated parameters. Typically, the performance of bathroom fans is 95 - 100 m3 / hour.

Noise level

Each bathroom fan is driven by an electric motor, the operation of which is always accompanied by two types of noise - mechanical and aerodynamic. The first noise can penetrate into the premises, spreading through the air duct, and the second one arises as a result of vibration of structural elements - walls protective casing exhaust fan and air ducts directly.

Noise that is more than 35 dB has an irritating effect on the human psyche. Therefore, noise control is an urgent task when choosing and installing exhaust fans for the bathroom. Thus, the noise produced by the device should not exceed 30 dB. If you are thinking about how to buy a bathroom fan to turn on the device at night, then remember that the noise level in this case should not exceed 25 dB. Noise indicators are indicated in the passport data.

The noise level can also be reduced by installing a silencer behind the fan and lining the inner surface of the air duct with sound-absorbing material. Silencers have two main designs - tubular and plate. In any case, the diameter of the air ducts should not be too small so that air “plugs” do not form due to turbulence of air flows, but it should not be excessively large, which increases the material costs of a large bathroom fan.

Security issue

One more important requirement to a bathroom hood is its protection from moisture penetration into the device. An exhaust fan is electrical appliance, and the bathroom is always damp. Contact with unprotected parts of the device or switch (and any electrical device has them) can cause a short circuit and significant consequences for the electrical wiring - such as a fire. This should be taken into account every time the question arises of how to choose a bathroom fan.

To avoid this, look in stores for fans that are designed specifically for the bathroom. They are marked accordingly. These are ordinary hoods, which are additionally protected against water penetration. For complete safety, bathroom exhaust fans use predominantly a voltage of 24 V. If a short circuit occurs in the wiring, such a low voltage will save the bather’s life.

Hood functionality

If you still haven’t decided which fan is best for the bathroom, you should stop at this one. important point, like functionality. There are two types of bathroom hoods - automatic and standard. Standard exhaust fans are ordinary axial systems with a check valve that blocks the flow of exhaust air back into the room.

Such fans work very simply: when the light is turned on, the air exhaust starts working at the same time, when turned off, the fan stops. This is convenient, but not always practical, especially when the moisture level is very high, because such a fan is short term time will not be able to remove all the moist air from the bathroom.

Automatic bathroom exhaust fans are naturally more advanced, but also more expensive. They are equipped with special timers to set the device for a certain operating time. Exhaust fans with a sleep timer run for approximately 25 minutes after you leave and then turn off automatically. A fan with a humidity sensor and timer will turn on when the humidity increases above a specified limit and turn off after a time period specified by you.

How to choose a fan for the bathroom if the bathroom ventilation system is connected to ventilation system kitchens? Bathroom hoods with a check valve are also available on the market. These devices will be a real boon if the bathroom and kitchen ventilation systems are a single whole. This fan pulls air out of the room, preventing it from entering the kitchen.

Price-quality fan

Next, pay attention to the quality of the bathroom fan, because high technical characteristics do not always guarantee long-term operation of the device. It is better to look at the offers of famous manufacturers of bathroom fans. Positive characteristics and consumer reviews will signal that your choice has fallen on a worthy device.

Confirmation of quality is the exhaust fan’s compliance with quality standards and the presence of certificates from special commissions, warranty documents and markings, which indicate the protection class (start from the lowest value - IP 34). Remember that a bulky hood will not always be of high quality.

Today, the size of bathroom fans is in most cases compact, but the devices are quite powerful. Also on the market are built-in appliances that forcefully remove moist air from the bathroom into ventilation shafts.

A good quality bathroom fan doesn't always have to be expensive. Even the most inexpensive and simple domestic device will efficiently cope with its tasks for 3-5 years. And you can always buy a more expensive device, especially if you are interested in the high functionality of the fan.

The bathroom is one of the most humidified places in an apartment or private house. Without a doubt, the answer to the question “How to choose a fan for the bathroom?” you already know. Let us stipulate once again that compact, but at the same time powerful models splash-proof hoods, the design of which prevents water from entering the air duct, minimizing the risk of short circuits. Basically, we have listed all the criteria for choosing bathroom exhaust fans. Now it remains to consider self-installation hoods in the bathroom.

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What are the criteria for choosing a hood for a bathroom? How practical is a bathroom fan with a timer? How to install it correctly in a room with a suspended ceiling? What should the connection of the device to the power supply look like? In this article I will try to answer these and many other questions.

Forced and natural

When is forced ventilation necessary?

Here are the signs that it's time for you to go to the store for a range hood:

In the bathroom between visits the water on the walls does not have time to dry;
Appeared on the ceiling or in the tile seams fungus;

It may also be a consequence of periodic flooding by neighbors above or faulty plumbing equipment. Leaks of risers in the ceiling are especially insidious: there are no visible defects, but the ceiling of the lower apartment is constantly damp.

The air is constantly humid and musty;
Towels and laundry items smell musty.

Find out how effective natural ventilation, a couple of simple tests will help:

Hold a piece of paper near the ventilation duct grille. During normal ventilation operation, it should be pressed against it by the air flow;

If this does not happen, repeat the experiment with a match or lighter. If the flame brought to the ventilation duct does not deviate in its direction, the duct must be cleaned before installing forced ventilation.

Ventilators are on staff of service organizations; All cleaning work is free for residents. The exception is the case when the channel is clogged due to their fault (for example, construction waste during repairs).

Shopping

Now let’s talk about how to choose a fan.

Performance

What should the hood output be?

If it serves only a bathroom or a combined bathroom, productivity is selected at the rate of 7 - 9 cubic meters per hour per square meter area. So, for a bathroom with a typical Khrushchev area of 2.5 square minimum required— 2.5*7=17.5 m3/hour.

In practice, the performance of fans with an impeller diameter of 100 mm usually starts from 50 - 80 m3/hour. This allows you, if necessary, to regulate the speed by dimming the device while maintaining acceptable ventilation quality. However, I will touch on the topic of connection in a separate section.

In Soviet-built houses, a more typical ventilation scheme is in which all air exchange in the apartment is carried out only through ventilation ducts in the bathroom and kitchen. The air flow is ensured by gaps in the wooden frames.

Supply plastic windows supply valves;

Provide forced air exchange taking into account the area of residential premises. For rooms, the air exchange rate is 3 cubic meters per hour per square meter. The required performance can be distributed across all ventilation ducts - in the bathroom, toilet and kitchen.

Installation method

Which fan should I install - overhead or duct?

The invoice is practical in the following situations:

It is installed instead of the ventilation duct grille directly on the wall;
It is placed in a suspended ceiling, the design of which prevents air from escaping through the cracks(for example, plasterboard).

If the ceiling is made of panels or slats, a duct fan installed directly into the ventilation duct or air exhaust pipe is preferable. IN suspended ceiling a hatch is installed for its maintenance and replacement.

The photo shows a hatch for access to a duct fan in the suspended ceiling of my attic.

Basic functions

What to look for special attention upon purchase?

To noise level. Silent operation is ensured by:

Plain bearing. Unlike rolling bearings (roller or ball), it does not rattle when the impeller rotates;

The bearing bushing must be bronze. Play will quickly appear on the steel bushing, which will lead to an increase in noise level.

Rounded blades. Square or pointed blades are noisy at high speeds;
Small angle of attack of the blades;
Closed impeller. Air is sucked in through a hole opposite its center or through a gap on the sides.

Additional features

What additional functions can hoods be equipped with?

Here short list possible options:

Autonomous power supply. The fan can operate on batteries or from a built-in rechargeable battery that is charged from the mains. Autonomy will be very useful in case of frequent power outages or in country houses;
A bathroom fan with a humidity sensor turns on when its threshold values are exceeded. It will work for some time after taking a shower and turn off on its own without creating unnecessary noise and saving energy;

The timer will allow the hood to turn off some time after the bathroom light is turned off. Of course, it will only work if the fan and light are powered through a common switch;
A check valve will prevent the occurrence of reverse thrust in windy weather. It ensures that your bathroom will not be saturated with aromas from neighboring apartments;

A low-voltage hood, powered by 12 volts, will be very useful in bathrooms with LED lights. Both it and the fan are powered through common block nutrition, outside the bathroom. This scheme guarantees your safety: even when short circuit you will not receive an electric shock.

Captain Obvious reminds us: choosing a fan with an abundance of additional functions is not always justified. The more complex the device, the higher its price and the lower its reliability.

Let's start installation

into the wall

How to install an overhead fan in a horizontal ventilation duct?

Installation is carried out using galvanized self-tapping screws with a length of at least 60 mm. They screw into plastic dowels, inserted into holes drilled in the wall around the ventilation duct. The grooves for fastening can be seen on the hood body, under the removable front panel.

Elongated grooves are more practical because they allow the fan to be leveled after the holes have been drilled in the wall.

After attaching the fan the gaps between its front panel and the wall are sealed acrylic putty. It will prevent exhaust air from entering the room. The elasticity of acrylic will allow the seam to withstand the inevitable vibration during fan operation.

To the ceiling

How is installation carried out in the case of a suspended ceiling?

The hood body is attached to Molly dowels through pre-drilled holes in plasterboard or other material. When tightening the fastener, its shell creates a back side the ceiling is a reliable support with a large area.

How to fix a ceiling fan in case of a suspended ceiling?

The socket of a rigidly fixed ventilation pipe is brought to the ceiling level. Opposite the socket, a cutout is marked in the stretch ceiling; then a reinforcing ring is glued onto it, after which the fabric inside the ring is cut out. The overhead hood is inserted into the socket using silicone sealant.

A nuance: it is much more reasonable to equip the ventilation duct with a duct fan, and the canvas -ventilation grille. Ideally, the space above the hanging or suspended ceiling must be ventilated. Otherwise high humidity will quickly lead to the appearance of fungus on the ceiling and walls.

How to install it yourself in case of duct fan and a plastic ventilation duct?

The fan is placed in the pipe socket, after which it is fixed in it with a second tightly inserted pipe. I used for a 100mm duct fan sewer pipe with a diameter of 110 mm and a compensating pipe.

The hood is placed in a compensator on silicone and fixed in it with a pipe. The power cable is routed through a hole drilled in the compensator with a diameter of 6 millimeters.

Private house

How to bring a ventilation duct to the street in a private house?

I made it through load-bearing wall on the ground floor and through the gable under the eaves on the attic. The ventilation outlet is equipped with a corner and an umbrella-deflector. The deflector prevents water from entering the ventilation system in rain and oblique winds, and also further enhances traction in windy weather.

Electricity

Which could be the most simple circuit hood connections?

The simplest option is to connect via a switch common to the fan and bathroom lighting. The wire is thrown directly from the light bulb socket. Main disadvantage Such a scheme is that the hood is idle for most of the day, while the bathroom needs ventilation constantly.

How to connect a bathroom fan to a switch, ensuring its operation independent of lighting?

It's very simple: use two-gang switch. Neutral wire - common for light and ventilation; the phase is hung on different buttons. In my opinion, this scheme is the most practical.

The most sensible solution is to connect ventilation to a separate switch key.

Is it possible to regulate ventilation performance?

Yes. I used a regular incandescent dimmer for this purpose. Statements that I periodically encounter on thematic forums are that fans require some special dimmers - clean water fairy tales: the lighting dimmer works great with any hood.

Dimming allows you to flexibly regulate fan speed, choosing between the maximum volume of pumped air and silence.