How to disassemble an exhaust fan in a bathroom: step-by-step instructions for disassembling and cleaning an exhaust fan

Most apartments do not have windows in the bathroom and toilet - and to create normal air exchange in the room, artificial ventilation should be provided. The operation of such a device allows you to ensure an optimal level of humidity, avoiding the appearance of mold and mildew on the ceiling and walls. However, periodically it will have to be removed from the vent for cleaning or replacement.

Knowing how to properly remove a fan in the bathroom and install it back, you can do the work yourself without involving specialists.

Fan on the bathroom wall

Typical causes of device malfunctions

To understand the causes of possible malfunctions with the hood, you need to know the principle of operation of the device. It is based on two-stroke indoor air purification:

All large molecular particles of the intake air volume are cleaned.
Filters all macro- and microelements of incoming oxygen.

Metal filter

The further cleaning process depends on the type of device design (combined, circulation, evacuating) and filtration elements.

What malfunctions may occur:

There is a problem with ventilation in the apartment - a duct is needed before installing the hood. If it becomes clogged, then all the circulated air, filled with unpleasant odors, will return back to the apartment or to the neighbors, and condensation will settle on the windows. Checking the draft force is very simple: you need to bring a lit lighter to the ventilation grille. If the flame deviates towards the air flow, this means that everything is in order with ventilation;
contamination of the grease trap or filter in the hood - instructions for carrying out preventive work against contamination of the filters or for cleaning the grease traps yourself are included with the hood;
malfunction of the lighting element - if the hood itself functions well, but the lighting does not work, most likely the light bulb has burned out. It is necessary to unscrew the grille and replace the lighting element; any housewife can easily cope with this task;
lack of electrical power - this may be due to mechanical damage to the cord. A specific smell and soft insulation in small areas of the cord may indicate that it has burned out;
problem with the switches - to eliminate this problem, you need to disassemble the hood and replace the broken buttons.

Switch board and button replacement

Also, the reasons for poor operation of the device may be a breakdown of the electronic interface, poor contact in the plug or socket, or loose terminals in the hood body.

In order to protect the device from power surges, it is worth purchasing a special voltage relay

Repairing a hood with your own hands is not difficult. It is enough to carefully study the mechanism of operation of the device, and the troubleshooting process will not be difficult.

Cleaning methods

After you have prepared all the elements of the hood for cleaning, you need to think about how the process itself will go. In order to cope with stains, you can use both special cleaning products and traditional methods.

Here are some of the most effective detergents:

Baking soda, which everyone has in their household, works great for dried greasy stains.
Laundry soap also copes well with stains.
Dish detergent will be useful in this matter.
Professional detergents are ideal for removing grease.
In stores you can find special compounds designed for cleaning stoves and ovens.

How else can you clean the hood over a gas stove?

A remedy for clogged sewer pipes.
9% acetic acid solution.
Citric acid.
Alkali-based grease removers - for particularly difficult cases.

You can find out the details and nuances of cleaning procedures by watching a video on how to clean a hood.

Bathroom ventilation

In this room, ventilation is necessary to remove large amounts of moisture that constantly accumulates here. Thanks to the presence of a hood, it is easy to breathe in the room, plumbing fixtures and household items do not deteriorate, and mold and mildew do not appear.

Recommendations from engineers when choosing bathroom ventilation

Engineers recommend not purchasing expensive, large equipment. The main thing is to correctly calculate the required power

Experts advise paying attention to the power of the wiring in the room. Since the hood has considerable power and pressure, the cable may be damaged due to power overload

When purchasing, quality, productivity, and dimensions are taken into account.

How to install a fan in the bathroom

When installing, you must follow the rules:

remove the cover;
Lubricate the places that will be adjacent to the wall surface with liquid nails or reliable glue;
place the product in the hole in the wall (the working part is hidden);
press the body well;
install an anti-moxin mesh;
Place the cover, securing it with dowels or self-tapping screws.

At the end of the work, the wires are laid, and the structure is connected to the electrical network.

The principle of connecting to the electrical network

The ventilation duct is separately wired for automatic activation by programming the device or a motion sensor. If the model has a cord, then you can turn on the system mechanically.

Control by turning the lighting on/off

Often electrical equipment is turned on at the moment when the lights in the room come on. But since an exhaust hood is usually necessary during bathing, this option is not very convenient - electricity is wasted, for example, during washing. Therefore, it is better to automate the system in order to save energy and provide additional convenience.

Why do you need a timer for a bathroom fan?

Equipped with a timer, the hood will turn on when the light is turned on, and turn off a few minutes after the person who took the shower has left the bathroom. During this time, the device extracts moist air. If the stay in the room was short, the structure will not turn on, since there is no need for its operation.

Connecting a bathroom timer

The timer is a compact device. It should be connected using 6 pins. To connect correctly, you need to use the diagram.

Bathroom timer connection diagram

Connection via switch

Before you start connecting the power wires, you need to turn off the switches on the switchboard. Then the front panel of the device is removed and wires are inserted into it through the channels.

How to connect an exhaust fan to a switch

The wires are connected to the terminals of the device located under the cover. In the absence of grounding, 2 wires are enough: phase and zero. The wires are connected to the terminals, secured with bolts, and a protective cover is installed.

Installation and fastening of fans with self-tapping screws or dowel-nails

Remove the top grill.
We place the fan housing against the wall and mark on it with a pencil the locations of 4 holes for fastening with self-tapping screws.
We drill holes with a hammer drill exactly according to the marks and insert plastic spacer dowels into them, which are often included in the kit.
We connect the fan to the electrical wiring according to these instructions, observing electrical safety measures.
We check its operation with precautions by briefly turning on the power supply.
We insert it into the ventilation duct and screw the fan itself to the wall with self-tapping screws.
We put the grate in place.

About the design of the most non-separable fans

This drawing shows a cross-section of the bearing assembly of a non-separable fan.

The impeller axle retainer, made of hard plastic, has three trap-type latches that securely hold the axle.

At the end of the axle there is a mushroom-shaped heel, which is pressed against the fluoroplastic gasket by the magnetic field of the engine. These two parts form a support bearing that prevents axial runout of the rotor. Small fans may not have a gasket.

The sleeve bearing is fixed with two or three latches on the engine frame.

To disassemble the fan, we will need to drill one or two technological holes. Through one of them you can cut off the latches holding the bearing bushing, and through the other you can knock out the axle or axle along with the retainer and bushing.

Lubrication and cleaning of parts

One of the most effective ways to restore the performance of an exhaust device is lubrication. To work, you should prepare machine oil and a regular syringe with a needle. The procedure is as follows:

Allow the engine to cool, then clean and start lubricating.
To operate, 2 drops of oil are required - the front bearing is lubricated first, the rear bearing is lubricated second.
Rotate the electric motor rotor, evenly distributing the lubricant over the area.

The next stage is to clean all parts from residual grease, dust and contaminants. To do this, you need to rinse them under running water (it is advisable to clean plastic elements using household chemicals). Before installing in place, all parts are thoroughly dried.

Standard diagram of a kitchen hood

Equipment of any modification of the hood (Krona, Bosch, Asko, Elikor) contains standard components:

four-speed motor – provides regulation of the air flow power of the exhaust fan. Thanks to this, air masses pass through the filters, in which heavy fat particles are retained;
filters – today there are many different filters for circulation modules: ceramic, carbon, hydrogen, carbon-plastic, fiber optic, absorption. They all work on the principle of rough cleaning of all types of material;
lighting lamps. The cooking surface is illuminated with LED lamps, halogen, ultrasonic and other light sources;
speed switching circuit - in various modifications of kitchen hoods, it is carried out using elements such as a switch, voltage regulator, dimmer, portable devices (switches, buttons, toggle switches).

Hood diagram

By installing a special application on your mobile phone, you can set the operating mode of the kitchen hood.

How to avoid damage to the hood: tips for proper operation

In order not to resort to kitchen hood repair, you should adhere to the operating rules for this equipment, which are established by the manufacturer. Let's highlight the main points:

Location above the stove.

If a gas stove is used in the kitchen, the hood should be installed at a height of 70-80 cm from the hob, if electric - at a height of 60-70 cm. If the hood is located below this mark, overheating of the structural elements with subsequent deformation is possible. At the same time, a higher location will reduce the efficiency of the device.

Start the fan.

If there is a manual speed switch, it is advisable to start starting from the lowest stage. Setting the maximum speed right away will increase the load on the electric motor, which can reduce its service life.

Filter care.

Untimely cleaning or replacement of filter elements leads to the fact that grease particles begin to penetrate inside the device, covering the engine, control board and backlight lamps with an oil film. In addition, practically no air passes through a clogged filter, so the efficiency of such a hood is zero.

Protection against voltage surges.

Like any other electrical appliance, a kitchen hood must be protected from power surges. Of course, a fuse is usually installed inside the device, but it cannot always protect the equipment from an unstable network. This can be better dealt with by additionally installing a protective relay, which instantly turns off the power if the voltage deviation from the norm is too large.

Voltage relay – additional protection of equipment from power surges

The complexity of repairing a kitchen hood depends on the nature of the problem. Anyone can change a burnt-out light bulb, but restoring the operation of a fan can pose serious difficulties. If there is no experience at all in repairing electrical appliances, then it is more advisable to turn to specialists so that you do not have to buy new equipment.

Disassembling the device: step-by-step instructions

Dismantling external ventilation parts

To remove the engine, it is necessary to disassemble the external parts of the kitchen ventilation. In this case, you can gain access to the engine system.

To do this you need to take the necessary tools and materials.

Attention You need to prepare a screwdriver of suitable diameter. In this case, there should be several screwdrivers, since some parts can be voluminous and engaged with large screws, and some elements are microscopic in size and can only be dismantled with special tools designed for careful removal of parts.. When the engine is removed from the device, check its resistance windings

To do this, prepare in advance a bundle of wires that go from the board to the electric motor. In this case, you can simultaneously diagnose faults in the motor and try to repair it without removing it from the hood. The method is less convenient, since a complex of additional work will first be required. It is better to dismantle the engine itself and not touch other parts in the ventilation housing

When the motor is removed from the device, the resistance of its windings is checked. To do this, prepare in advance a bundle of wires that go from the board to the electric motor. In this case, you can simultaneously diagnose faults in the motor and try to repair it without removing it from the hood. The method is less convenient, since a complex of additional work will first be required. It is better to dismantle the engine itself and not touch other parts in the ventilation housing.

Cleaning and checking

Whatever caused the ventilation motor to break down, remove the dirt and lubricate the bearing with oil.
The dismantled motor is placed on a horizontal surface and the starting condensate is checked.
If there is no short circuit, it is returned to its place.
If the condenser is broken, it is replaced with a similar one in capacity and operating voltage.

After cleaning all the grooves, dry the small parts well. Cleaning can be done with a soft cloth that does not leave streaks or scratch the surface. After cleaning, the serviceability of the engine is checked. The problem of its failure to work could be due to clogging of parts. After cleaning, the structure can become serviceable.

When the motor is installed in place, its performance is checked. If the problem also persists, the ventilation works very poorly, which means the engine needs to be replaced or some of its components are broken. The device is again removed from the fan and its performance is checked in detail.

Testing and assembly

If a broken electric motor cannot be replaced, then you can try to short-circuit its wires. This testing will help determine the performance of the motor with shorter wires. Repairs to faulty wiring are rarely carried out. Branded hoods are designed in such a way that the motors in them rarely burn out. This means that the operation of the motor cannot be disrupted due to electrical problems. But this only applies to modern technology.
If we talk about a simple hood with a simple motor, then everything is much more complicated.
You will have to test and assemble such a part in the ventilation several times in a row. It is necessary to apply mains voltage to the working and starting windings. There are situations when the motor hums (this means the electrical network is working properly), but refuses to work. The engine may gain speed when turned on when cranking it manually. This situation indicates a fault in the starting winding. It needs to be removed from the electric motor and replaced.
The hood motor is checked by ringing the windings according to the diagram specified in the operating instructions. If at least one winding does not ring, then the engine must be repaired or sent to a service center. And in the most difficult cases, completely replace it with a working one, which not everyone can do on their own at home.
Incandescent or halogen lamps are simply replaced. They are simply turned out of the hood and checked for functionality. In this case, the procedure can be performed in any suitable cartridge or base.
Repairing LED systems will require additional steps.
You will need to remove the lamps and connect them to a low voltage DC source. An adapter-converter is connected to the system, which will help obtain the 3 V voltage required for the LED. The converter adapter is also checked with a tester to ensure it matches the voltage required for operation. When using a standard 220 V LED lamp in the system, repairs only involve cleaning the contacts in the lamp base.

The structure and principle of operation of the hood

To properly disassemble and wash the hood in the bathroom, you should familiarize yourself with how it works and works. The most common models for installation in the bathroom are axial (axial) fans, which are mounted on the wall in the place where the ventilation duct passes.

The axial type hood has an extremely simple device. The device captures air by rotating the axis on which the aerodynamic impeller with blades is fixed. Behind it is a compact motor, thanks to which the axis moves.

The impeller blades have a certain slope. It causes air to pass through the fan system, partially prevents the re-entrainment of the exhaust flow and contributes to the formation of pressure that entrains air into the ventilation duct.

But even such a simple device can effectively purify the air from steam and unwanted impurities

It is only important to monitor the cleanliness of the device and the presence of the necessary traction. The fan blades are the most sensitive to contamination, since most of the dust and smoke particles settle on them if there is smoking in the room.

The fan blades are the most sensitive to contamination, since most of the dust and smoke particles settle on them if there is smoking in the room.

The place where the impeller is attached to the axle also needs thorough cleaning. In addition to removing debris, this area must be lubricated periodically. A couple of drops of special oil will be needed for the front and rear bearings located near the motor.

You can tell that it’s time to dismantle and wash the hood by visual inspection by shining a flashlight behind the outer grille.

The following signals may indicate the need for cleansing:

increased noise level generated by the fan during operation;
decreased draft due to decreased hood performance.

All these facts indicate that the rotation speed of the aerodynamic impeller has dropped, so the hood needs to be disassembled, scheduled cleaning and diagnosis of possible faults.

How to Remove the Cover From a Vents Fan

Cleaning the exhaust fan. extend the life of the exhaust fan

Installing a fan in the bathroom is a very good idea. Thanks to this, you can ventilate the room in a matter of minutes. Thanks to the fan installed in the exhaust pipe, the draft itself increases, which is useful for increasing the humidity in the bathroom or after a smoke break.

However, over time, especially if you go to the bathroom or smoke in the toilet, the hood becomes very dirty. As a result, traction weakens. In addition, over time, the lubricant in the motor bearings runs out, and the fan begins to work poorly and may even burn out. Therefore, it should be prevented periodically.

If your fan starts squeaking and changing speed through the wedge, don't rush to throw it away, it can still extend its life. First remove the fan. Usually secured with four screws. It is connected to the power supply using a regular two-wire terminal. It is convenient to connect the fan to a switch so that it can be turned on and off if necessary.

So the fan is very dirty, the motor jams and overheats, so it needs to be lubricated and cleaned.

Figure 1.

Disassembling the fan begins with removing the impeller. It is attached to the motor shaft using a collet clamp with a conical thread; the nut must be unscrewed clockwise.

Figure 2.

After unscrewing the nut, the fan impeller is easily removed from the shaft.

Vents hood repair. Replacing the wire.

The rupture wire came off. Get wet and get off. The hood had to be opened to replace it.

Rice. 3.

Turn the front of the fan and disconnect the motor wires from the terminals. Otherwise, the takeoff engine will fail.

And to remove the engine, it is secured with two screws.

Figure 4

The motor is installed in the fan housing using two screws. To remove the engine they must be rejected. When removing the engine, it must be supported. If you are disassembling a fan that has recently been running, wear gloves because the motor is hot. Or let the engine cool down before disassembling.

Here is the engine fan itself.

Figure 5

To lubricate the fan, apply a few drops of oil to the front and rear bearings. It is convenient to use a medical syringe with a needle. It is necessary to drip oil when the shaft enters the engine housing on one side and the other.

Let's be cool. Then clean and oil it. For lubrication, the fan requires literally two drops of machine oil, not a lot of pouring. One drop is needed for the front bearing, the other for the rear. Then turn the engine rotor (shaft) by hand to distribute the oil. You can immediately feel that the rotation has become much better. Now the engine will not jam and overheat.

We then remove all parts under running water.

Rice. 6

All plastic parts are washed with water and detergents. All parts must be thoroughly dried before assembly.

Now we assemble his fan and install it.

Rice. 7

Fan assembly. First the motor is installed, then the clamp is connected, and then the impeller is attached. The assembled fan is installed in place and connected to the power source.

We looked at how easy it is to bring an old fan back to life. In most cases, fan failure occurs due to contamination and lack of oil in the motor bearings. By cleaning and lubricating the motor regularly, you can extend the life of your fan. The whole job takes no more than 10-15 minutes and saves time and money that could be spent on a new fan for the bathroom or kitchen.

Preparatory work before installing fans

Remember that the exhaust fan will only work effectively if fresh air flows freely through the gap between the door and the pogrom or door slots (grill).
Installing a fan will be useless if the ventilation shaft is clogged. Read how to check its functionality here.
Installation should begin only after connecting the fan to the electrical wiring. This often requires running a separate electrical cable from the nearest junction box. Read how to do this correctly on this page.
Sometimes it is necessary to expand the ventilation duct if the fan does not fit into it without effort. If the hole, on the contrary, has a much larger diameter than necessary, then it is necessary to select and insert into the hole a plastic pipe that matches the diameter of the exhaust fan. After this, fill the voids between the pipe and the wall of the bathroom or toilet with foam. After the foam has hardened, cut off any excess foam with a knife.
Be sure to remove and check that the fan grille completely covers the unfinished area in the bathroom or toilet. If necessary, putty and touch up the areas around the grille that it will not cover.

Vents hood repair. Replacing the wire.

The switch wire came off. Got damp and came off. To replace it, you had to open the hood.

How to disassemble the hood in the bathroom and what was found there?

We disassemble the kitchen hood

The need to remove the hood may arise not only due to operational problems. Periodically you need to clean the filter and wash the unit. For the average consumer, disassembling and dismantling the hood will not take much time. Manufacturers have done everything to make this process as simple as possible.

Before dismantling the hood, it should be disconnected from the power supply.
When disassembling the hood in the kitchen, re-read the instructions, since each model may have its own characteristics.
Remove the filter grids located on the bottom panel by moving the latches (clips).
Disconnect the light bulb connectors.
Remove the fan: unscrew the impeller from the stopper and release it from the motor. Sometimes the design includes a spring clip or other fastening.
The last thing to remove is the control board and the motor (there may be two of them).

Image taken from https://www.youtube.com/watch?v=tiDU69oE6mg
This is what dismantling the hood looks like. There are models that are even easier to disassemble, since they consist of blocks independent of each other. For example, to remove the motor, it is not at all necessary to remove the backlight unit.

Removing and hanging a fan in the bathroom and toilet

Knowing how to properly remove a fan in the bathroom and install it back, you can do the work yourself without involving specialists.

Fan on the bathroom wall

Types of exhaust fans

All devices for forced exhaust in the bathroom are divided into several types:

By launch method. Without control and with control via sensors and remote control.
At the installation site. Wall-mounted fans are often used for exhaust hoods; they can be easily removed if necessary, for preventive maintenance or replacement.

But there are also ceiling ventilation devices; they have many advantages:

high productivity;
easy installation;
the ability to hide the fan housing behind a false ceiling;
nice design.

Ventilating devices for exhaust hoods are also divided according to installation depth. There are overhead fans and those built into the wall at one level.

By type of construction.

In order to understand which fan is best suited for bathroom and toilet hoods, you need to understand their structure.

There are four of them in total, but only two types are used in everyday life:

Axial. The most popular model for use in bathrooms, since its installation is the easiest. The device is a cylinder, inside of which there is a motor with blades on a shaft. You just need to insert it into the ventilation shaft and secure it.
Radial (centrifugal). It received this name because of the principle of its operation when air masses rush outward due to centrifugal force.

There are also channel devices. These ventilation devices are used for exhaust in hospitals, schools, kindergartens and other institutions.

Industrial installations are also used. As the name suggests, such fans are used in production workshops and factories.

Installation and fastening of fans with self-tapping screws or dowel-nails

Remove the top grill.
We place the fan
against the wall and mark on it with a pencil the locations of 4 holes for fastening with self-tapping screws.
We drill holes with a hammer drill exactly according to the marks and insert plastic spacer dowels into them, which are often included in the kit.
We connect the fan to the electrical wiring according to these instructions, observing electrical safety measures.
We check its operation with precautions by briefly turning on the power supply.
We insert it into the ventilation duct and screw the fan itself to the wall with self-tapping screws.
We put the grate in place.

Duct fan

Today, the most popular type of fan is the duct fan. The reason is that its operating principle is similar to that of an air conditioner. It not only cleans the air, but also maintains it at a certain temperature. With all this, the channel type, by its structure, is the most difficult to repair. Therefore, few are able to independently identify the cause of its malfunction.

By the way, there may also be several reasons. From simple pollution to overheating of the electric motor. The reason, characteristic only for the channel type, may be the need to change the direction of the channel. In any case, the mechanism requires disassembly and careful inspection.

The duct fan itself is only part of the air filtration system, but it is its most important part. It directs air to the filtration and purification system.

Fan disassembly depends on many factors. First of all, this is the way it is assembled at the factory. The parts can be connected with bolts, screws, etc., or they can be welded. In addition, duct fans are assembled specifically for the filtration system. Depending on it, designs and assembly patterns may be different. Therefore, disassembly of the most popular type of duct fan – square – will be described.

For disassembly you will need a screwdriver and pliers.

Incision

Disassembly algorithm for a square-type duct fan:

1. Turn off the power supply.

2. Disconnect the working unit from the filtration system. The fan is the edge link of the system, so separating it will not be a difficult task. The pipeline is connected to one of the walls of the mechanism. As a rule, the pipe is not welded, but bolted. Therefore, it can be easily separated with a screwdriver.

3. Remove the machine from the wall. As in the case of a bathroom fixture, the duct cannot be disassembled without removing it from the wall.

Once dismantled, the entire mechanism is essentially a fan inside a large square box. Using its walls, the direction of the collected air is regulated. Therefore, if a change in direction is required, the box will be the main element of disassembly. The device itself, in this case, does not require disassembly. If checking the engine or assessing the integrity of the blades is required, dismantling and disassembling the fan itself is required.

4. Remove the blades. They are attached to the electric motor with a nut along the main working axis. The nut can be easily unscrewed with pliers. The electric motor itself is in most cases welded to the box, so it is most often not dismantled.

5. After removing the blades, access to the engine opens. On the back side, as in cases with other types of fans, it is attached with bolts

When removing and inspecting the motor, be careful not to damage the cables.

Backside. Motor housing

In addition to square ones, other duct-type devices are also widely used in ventilation systems. Their shape depends on their purpose and location. However, the difference between these machines is only in the shape of their “boxes”. The fans themselves operate according to an identical scheme, and, therefore, are disassembled in the same way.

To summarize, it is safe to say that fans are not such a complex system. They are quite simple to assemble and disassemble, but require accuracy and literacy. And if their disassembly and maintenance in proper condition is done systematically, then over time disassembly will become a familiar and simple process, and the mechanism will last much longer.

Reverse in the air duct system

In private homes, an air duct system connecting several exhaust vents to one ventilation shaft has become widespread. Some points may be equipped with forced air intake devices, such as a kitchen hood or duct fan.

The occurrence of reverse draft in one of the branches of the air duct can be caused not only by the problems with the general exhaust described above, but also by the redistribution of the flow vector within the ventilation duct system.

The operation of powerful hoods creates a high-speed flow and increases the pressure in the air duct. Therefore, air rushes towards all open vents

To prevent such a scenario, install check valves for each of the air duct branches. These devices allow flow in one direction and close the channel cross-section when it is reversed.

As a rule, when installing an air duct, specialists install check valves. It may not exist in case of additional insertion of branches, if the installation was carried out later. In this case, you need to install such a device. You can do this yourself without rebuilding the entire air duct system.

To do this you need:

Purchase a valve of suitable sizes.
Disassemble the air duct system in the place where it will be installed.
Cut a section of rectangular duct or flexible pipe the size of the valve.
Assemble the system with the valve.
Check its tightness.

If a check valve is installed, but backdraft occurs, this means that the device is faulty.

There may be several reasons:

the appearance of a gap in the membrane, leaf or shell of the valve;
wear of the moving parts, resulting in the sash or membrane not closing;
dense debris (for example, a piece of paper or a large beetle) that prevents the device from completely closing.

In any case, it is necessary to disassemble part of the air duct and remove the valve. If it is impossible to repair it, you should purchase a device of the same dimensions and reassemble the air duct.

Selecting a ventilation device

When installing a hood in the bathroom, you will need to choose a suitable fan.

Let's look at the parameters you should pay attention to:

First you need to find out its power, that is, how much air it can move through the system. Basically, this value depends on the diameter of the product. Fan diameter. This indicator will be discussed in more detail below. An important factor is the design of the device. Some manufacturers produce fans with a replaceable outer panel. Models Elicent, Electrolux, Ballu are available in different shades of color. A beautiful and fashionable device can be placed so that it will be the center of attention when entering the bathroom. Or, on the contrary, you can hide it behind the panel and it won’t be visible

The only condition that must be observed is to prevent it from coming into contact with external electrical wiring, because the device will have to be located in an area of high humidity. When choosing, pay attention to the noise level of the fan, since excess noise in the bathroom is annoying. The noise level that does not affect hearing should not exceed 25-27 dB.

You also need to pay attention to the warranty provided by the manufacturer. If its duration is less than 12 months, then it is better to refrain from purchasing this model

Let's look at some of the fan's characteristics in more detail.

Power calculation

First you need to calculate the volume of the room.

V= a × b × h, where:

a is the length of the room;

in – width;

h – height;

V is the volume of the room.

A. For example, a bathroom has dimensions: 1.5 – length; 1.5 – width; 2.8 – height. Find out the volume of the room by multiplying. It is equal to 1.5 × 1.5 × 2.8 = 6.3 m³. Round up to 6 m³.

To calculate productivity, you need to multiply the volume of the room by the air exchange rate (this value is determined from the SNiP reference book). The number of air changes in a bathroom is 6-8 times, for a toilet this figure is 8-10 times. The specific number is selected depending on the number of family members who have benefited from the treatments in these rooms.
Accordingly, from the table we select the required air exchange rate, for example, take the indicator 8 for the bathroom. Multiply 6 m³ × 8 = 48 m³/h. In other words, 48 m³ of air must be replaced in one hour.

Based on the calculations obtained, you need to select the appropriate fan for the bathroom. This usually adds up to 30% of the total performance of the device.

Device diameter

Nowadays on the ventilation equipment market you can find products with different air duct cross-sections. Classic sizes include: 100, 105, 125, 160 mm and others. The diameter of such devices must be selected, first of all, based on the size of the ventilation shaft opening.

Secondly, on the required parameters of the product. For example, the power of the exhaust device will significantly depend on the diameter of the blades. Obviously, the larger the diameter, the greater the productivity of the device.

In houses built in the 60s and 70s, the apartments are relatively small, and the best option there would be a diameter of 105 mm. In new buildings of recent decades, apartments are rented with a larger area; in this case, it is recommended to choose 125 or 160 mm.

Reasons for removing the device

After several years of use (or sooner if there is smoking in the bathroom or toilet), the efficiency of the exhaust fan decreases. The reasons for the problems include:

contamination of the device blades, which reduces the draft of the ventilation system;
deterioration of lubricant characteristics, due to which the impeller rotation speed decreases and the noise level increases;
wear of individual elements of the device requiring replacement.

Due to the decrease in the speed of air passing through the fan blades, the humidity in the bathroom or toilet increases, and the conditions become less comfortable. The situation can be corrected by periodically performing preventative maintenance on devices and, if necessary, replacing them with new ones. When replacing, ventilation efficiency can be improved by choosing a more efficient model.

You can know that it is time to clean or replace the fan by the appearance of squeaks and noises, due to which the device becomes a source of acoustic discomfort. In most cases, the air in such a situation becomes not very fresh, and the engine overheats, increasing the risk of failure of the device. Therefore, timely maintenance not only improves air exchange and reduces noise levels, but also increases the service life of the fan.

The backlight does not turn on and/or the fan speed does not switch

Usually the lack of light in the hood is due to two reasons. The light bulb is burnt out or the switch is faulty. Poor contact on the switch often results in no backlight. On hoods with a mechanical control type, the button often gets stuck due to dirt getting inside. The problem can be resolved by disassembling and cleaning the switch. If the contacts are oxidized, then they are cleaned and everything is reassembled in the reverse order.

The inability to change speeds is also caused by faulty buttons. The speed is switched by several buttons located in one block. After removing the protective screen, check the integrity of the contacts and tracks on the board. If there is no visible damage, the circuit is checked by a tester. If the circuit is in order, the cause of the malfunction may be in the starting capacitor, which has burned out.

DIY repair

To replace the granules in the carbon filter, the air intake grille is carefully removed. Immediately behind it is a carbon purifier. The used granules are removed, and new ones are poured inside. If the carbon cleaner is not dismountable, it is simply replaced with a new one. Replacement process:

Be very careful when disassembling the device

remove and place the air intake grille “face down” on the table;
disconnect the old cleaner;
carefully lay the new filter;
install the grille in place.

If a light bulb burns out, it is replaced with a new one of the same type. If your new kitchen hood light still doesn't light up, then the problem is with the switch. One of the wires “comes off”, so the light in the kitchen hood does not work. If the halogen bulbs do not light up, the cause may be a burnt-out transformer in the device housing.

The hood does not remove odors from the kitchen well

Usually this does not happen due to a malfunction of the hood, but for other reasons.

Incorrect device selected. The hood motor does not provide enough power for a large room.
Incorrect connection (if any) of the hood to the ventilation.
The air duct has a large length and many rotation angles.
There is no or reverse draft in the channel to which the hood is connected.

If at first the odors were removed from the kitchen normally by the hood, then the reason is most likely due to clogged filters. You can check whether the carbon filter can be disassembled. If it is possible to disassemble, then the coal granules in it are changed. Non-separable filters will have to be changed.

When dirty, the grease filter can be removed and cleaned, and then installed back into the device. Cleaning and/or replacing the filters will restore the efficient operation of your kitchen hood. It’s not difficult to do this procedure with your own hands and it won’t take much time. Sometimes the smell is poorly removed if the hood is not used correctly. You should turn on the air purifier not during cooking, but a few minutes before it starts, in order to normalize the air flow. After finishing cooking, turn off the hood after 10-15 minutes. During this time, the remaining polluted air can be removed.

Preparing the hood for cleaning

How to clean grease from a hood? Every housewife knows how quickly this type of equipment gets clogged and how difficult it can be to deal with a thick layer of fat.

Before you begin cleaning procedures, you should read the user instructions, since the hood will have to be disassembled.

Here are some tips we recommend you take into account:

Under no circumstances should you disassemble the device without unplugging it from the mains.
Next, you need to remove the hood cover. Using the instructions and a detailed diagram for assembling/disassembling the device, find its latches.
Keep in mind that the pipe that is the ductwork also needs regular cleaning. Some owners simply replace the corrugation with a new one, but this method does not work with all models of ventilation systems.
Then it is necessary to thoroughly clean the filter and the unit body itself from grease deposits.

How to clean it properly

Before you start cleaning, you need to familiarize yourself with how to do it correctly.

Preparation

First you need to check the functionality of the ventilation. There are two common ways to check exhaust ducts:

Using a burning match, lighter or candle. The ignited object must be brought to the channel. If the flame starts to move towards the hood, it means it is working properly. However, when the flame does not change its direction, it means that the ventilation needs to be cleaned.
Using a piece of paper. It is applied to the opening of the hood. If it starts to be attracted to the grate, then it’s not worth cleaning.

Cleaning procedure

When cleaning the system, the following actions are performed:

Remove kitchen furniture. If you are cleaning the hood in the kitchen, you need to get rid of all the kitchen furniture. The floor is carefully covered with newspapers to prevent debris from falling on it. Remove the grille. It is first removed to make it easier to clean the ventilation duct. If the grate is too dirty, replace it with a new one. Cleaning. After removing the grille, begin cleaning. To do this, you need to wear construction gloves and clean out the debris that is inside the channel.

The work must be carried out carefully, as there may be nails, glass and other dangerous debris inside.

Conclusions and useful video on the topic

The detailed process of removing the hood cover and the amount of dirt that has settled on the parts is filmed by the author of the video below:

The author of the following video explains how to properly install a hood on a bathroom wall if the hole leading into the ventilation duct is significantly larger than the diameter of the fan inlet:

Detailed disassembly and repair of the hood was demonstrated by another author:

A properly functioning hood in the bathroom is the key to maintaining a normal microclimate throughout the entire home, since the presence of excess moisture in one room will inevitably affect the overall level of humidity in the apartment.

Like any other device, an exhaust fan requires periodic maintenance and cleaning. Dismantling, disassembling, cleaning and reinstalling a wall-mounted hood does not take much time and does not require special knowledge. However, if after performing the planned procedures the fan still does not provide proper air exchange, you should pay attention to the correct functioning of natural ventilation.

Have you recently disassembled the fan and cleaned it of dirt? Share your experience with other users, tell us which area of work was the most difficult for you. If you still have questions about the topic of the article, ask our experts - the feedback form is located below.

Examination

Before taking active measures, you need to check for blockages in the ventilation and find out the location of the ducts.

Old-timers advise using a flame from a lighter or match. If you bring it under the ventilation grille in the bathroom, it will be attracted towards it if the hood is working properly.

The hood attracts the flame of a lit match.

A safe check can be carried out using a thin strip of paper 30 x 3 centimeters. Make sure all doors and windows are closed, bring the paper closer to the grille. If it attracts, it means that communications do not need cleaning. It doesn’t move, the attraction is weak - you need to take action.

A working hood pulls in a sheet of paper.

Pay attention to related topics!

They also discuss other methods of prevention and repair of fans. In particular, the process of disassembling non-separable fans with nylon clamps and the technology for restoring broken plain bearings are described.

How to Remove Dospel Fan Cover

Installing a fan in the bathroom or toilet

to install an exhaust fan in a bathroom, toilet or kitchen with your own hands, without the help of third parties. The whole process takes from 15 to 20 minutes. You will learn further how to do the installation correctly from this annotation. Answers@ how to remove the cover from a dospel fan. Before you begin installation, you need to connect the fan according to our instructions, and also choose the right one for the kitchen, bathroom and toilet.

Before installing the fan, I recommend that you read the instructions in the kit, which should carefully outline the installation procedure and features for your model in Russian. If there is no annotation or description, this most likely indicates the cheapness or low quality of the product you received.

AutoNews / Reviews / Tests

Sources:

https://autobryansk.info/ventiljator-dospel-kak-snjat-kryshku.html

Household chemicals for cleaning hoods

Professional products are used for old stains. If the hood has not been treated for more than six months, home methods cannot cope with the problem. The following products are needed: Fairy, Shumanit, Green&Clean Professional, AmWay, Sano Forte Plus, Topperr, Mister Muscle, Silit Banks, Mole. They certainly have their advantages: they are narrowly targeted (they act on a specific type of pollution), require virtually no effort, and are used economically. But at the same time, these solutions can be aggressive towards metal and other materials from which the hood is made.

The method of processing components does not require more than 10 minutes and consists of soaking the hood parts in professionally prepared solutions. If there are no contraindications in the instructions, you can wash the grill and accessories in the dishwasher.

The mole cleaning method is considered the most radical. It can be used a maximum of a couple of times during the entire service life of the hood. It involves immersing the parts in Mole's solution (be sure to wear gloves while doing this). The reaction begins immediately. After treatment, you need to rinse the hood parts under running water for a long time. The alkali contained in the product should not remain on the components; it “eats” the metal.