Silent duct fans for exhaust: existing types of devices and their operating parameters

Varieties of duct fans for exhaust

According to the configuration, the fan for ventilation is round, square and rectangular. The first variety is usually used for domestic purposes, and square or rectangular devices are designed for installation in ventilation shafts of industrial premises.

Depending on the design features, axial, centrifugal and radial fans are distinguished. Consider the features of each variety separately.

Centrifugal

The centrifugal exhaust fan was invented relatively recently, but is already very popular. The device is installed in a room with an area of ​​no more than 15 m². It works almost silently, but at the same time has a high power. Centrifugal fans can be installed on the air intake or inside the ventilation shaft.

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The main difference of the device is that its blades are located along the central axis and do not have deviations in the longitudinal plane. When working in the peripheral zone of the channel, increased pressure is created, and in the central part - reduced pressure. This contributes to the active suction of air inside the device.

Radial

Radial devices have a body of a spiral configuration. A shovel wheel is installed inside it. When the wheel rotates, the air moves in the radial direction and, compressed under the action of centrifugal force, is removed from the housing.

The direction of the blades can be different. When turning back, the unit saves up to 20% of electricity and is much quieter. But when the blades turn forward, the power of the device increases. As a rule, domestic exhaust fans are units of radial or axial type.

Axial

The axial exhaust fan has a cylindrical housing. Inside it is an electric motor with blades. During the operation of the unit, air masses move in the direction of the axis of the device.To improve the aerodynamic characteristics, a collector is mounted at the inlet.

The advantages of axial fans include high efficiency. The unit can pump about 100 cubic meters of air per hour. Another plus is the ease of installation. The disadvantage is the high noise level during operation (up to 50 dB) and the low pressure of air masses.

RVS Elektra 125 - channel

Forced-air and exhaust fan of channel type. It is mounted in a ventilation shaft or a round air duct. High-quality moisture-resistant ABS plastic is used. The electric motor is designed for continuous operation, it is economical.

The device is used in a bathroom, shower room or bathroom, kitchen, and other rooms of a small area. The principle of operation is axial. Differs in a simple design, unpretentious, does not require special maintenance work.

Pros:

• Channel, it is convenient to mount in a round air duct.
• Economical, can work without interruption for several hours.
• Performance, low noise, good quality plastic.

Minuses:

No negative properties were noted by consumers.

Is it possible to repair a duct fan yourself

The possibility of restoring working capacity depends on the nature of the breakdowns, the qualifications of the performer. In a 200 mm duct fan (and in general of any diameter), it is not difficult to replace a damaged mesh partition, individual fasteners, typical electronic parts, switches, indicators. It is not too difficult to make a decorative panel with your own hands exactly according to individual requirements.

Rewinding of electric motor coils is carried out using special equipment.It is better to entrust such a task to specialists in a specialized workshop. The second acceptable option is to install a new power unit with similar technical characteristics. The assembly is carried out with the exact centering of the impeller.

Types of silent fans

Between themselves, silent fans are divided into several types, due to which sewage ventilation is carried out:

• Radial option. In everyday life, this type is not used, since it is suitable for pipes of large enterprises with a powerful branched ventilation system. Due to the corresponding view, which can be found in the photo, they received the name "snail".
• Axial option. It differs in that the direction of the riser air coincides with the axis of rotation of the motor rotor, which sets the blades of the device in motion.
• Silent overhead fans. This is the most commonly used option in everyday life. Their main advantage is ease of installation, which you can do yourself, following the instructions. If the apartment has a ventilation duct that provides air outlet to or from the pipes, this unit will not require ducting.
• channel options. Its installation is carried out directly in the ventilation duct, being its integral part. True, in this version there is a certain amount of vibration, as a result, it will not work to call it completely silent. However, this problem is easily solved.

You can also find other options for the types of devices that provide outlet and circulation of air from pipes, which you can install yourself. However, all of them are due only to the presence of additional functions.An example of this is the ventilation option, which will not work if the hood is turned off, or with the presence of a dispenser for the volume of air passing from the pipes of the riser.

Rules for choosing an exhaust fan

To choose a duct fan for the hood, you need to pay attention to its power and dimensions, as well as take into account what material it is made of. In addition, consider the safety class and functionality of the unit.

Power and dimensions

The power of the device is the volume of air that passes through the unit during its operation in a certain unit of time. This indicator is measured in cubic meters per hour, depends on the speed of rotation of the impeller and the size of the fan. How more dimensions and rotation speed, the higher the power.

Household duct appliances have a diameter in the range of 100-125 mm. For public places, you will need a unit with a diameter of 160-200 mm. Larger models are considered industrial, so they are not used in everyday life.

Manufacturing materials

Modern household fans are made of plastic. They are quite light, so they are easy to install. Since the device operates at normal temperature, you do not have to worry about the combustibility of the material.

Industrial duct fans are made of galvanized steel or aluminum. They are heavier and require reliable fixation during installation. Devices used in production must withstand extreme temperatures and loads, therefore they are made of more durable and durable material.

Do-it-yourself duct fan repair

Here's what is never recommended to do - do-it-yourself repairs. Typically, the fan motor or capacitor fails. If the first burned out, then it will have to be replaced with a new one. And it’s not a fact that you will find a motor in the store that matches the brand of the engine.

As for the capacitor, if you understand something in electrics, then you can handle the replacement. To do this, you will have to measure the capacitance of the part with a multimeter. If it corresponds to the passport (indicated on the case) or a little more, then it's not about him. But if the capacity is less, then you have to change. By the way, it is necessary to measure the parameter with the capacitor disconnected from the network with its preliminary discharge (close the two ends with a wire).

But, as practice shows, high-quality models will serve faithfully for more than a dozen years. And if at one point there was a failure in work, it is better to put a new one instead.

You should not repair it yourself, if only to check the capacitor and the electric motor for integrity

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Dimensions

Duct fan sizes may vary. In apartment buildings, it is best to mount those devices whose dimensions correspond to the mass varieties of mines and ducts:

• 100 mm;
• 200 mm;
• 125 mm.

Duct devices with a size of 315 mm are characterized by high performance, they can ventilate even large (not to mention medium) rooms. There are options with steel and plastic cases. Thanks to the use of rolling bearings, some manufacturers are able to increase the period of normal operation to 40,000 hours or more. Fans with a cross section of 160 mm have a fairly significant performance, they can pump from 400 to 560 cubic meters. m of air per hour.At the same time, the cost is only slightly increased compared to products of smaller dimensions.

There are improved versions of the same size, differing in:

• reduced noise;
• remote control option;
• increased power.

Inline fans with a cross section of 150 mm allow, on average, to pump from 400 to 550 cubic meters per hour. m of air. There are dozens of companies producing blocks of this size. Therefore, the choice of suitable systems is not difficult. Guaranteed excellent performance (adjusted for the limited section of the pipeline). The possibility of hiding a small product behind a false ceiling or in a wall significantly increases the aesthetic characteristics of the room.

Fans with a cross section of 250 mm perfectly help to ventilate even large areas. Since efficiency is especially important here, most systems are designed to complete round ducts. It is possible to ensure rational consumption of electricity. The largest units with a diameter of 400 mm can also be installed only in round ducts by vertical or horizontal connection.

It is very important to equip devices that regulate the speed of torsion

Technical characteristics of duct fans and selection rules

Like all devices of this type, channel ones have one main characteristic: power (performance). More precisely, the volume of air that passes through the device per unit of time. Usually, cubic meters are used for measurement, passing in one hour - m³ / h.

This indicator depends on two parameters:

• the speed of rotation of the electric motor (impeller), and the higher the speed, the higher the performance;
• the overall dimensions of the fan itself, the larger they are, the greater the power.

In addition, it is necessary when choosing to pay attention to other qualities of the device. Namely:

Security class. This refers to protection against dust and moisture.

This is especially important if you choose a silent exhaust fan in the bathroom.

Functionality. This refers to the automatic operation of the device or the standard

The second includes the function when the device starts working when the lighting is turned on. To the first, when it turns on at certain intervals programmed in the settings.

On the nameplate of the fan, all its characteristics are indicated

Fan performance

By eye, this option cannot be selected. Because it will depend on the required air exchange in the room. If we are talking about the general ventilation of the house, and not about a specific room, then you will have to add up the air exchange values ​​\u200b\u200bof all the rooms of the house. This will be the performance of the fan.

For example, a house in which the total living area is 100 m², the ceiling height is 3 m. In them, the air exchange will be equal to the volume of the room, that is, 300 m³ / h. Here it is necessary to add the air exchange of the toilet and bathroom - 25 m / h each and the kitchen 60 ÷ 90, depending on the type of hob and the number of burners. It turns out:

300 + 25 + 25 + 70 = 420 m³/h.

This is the performance of the fan.

The bigger the size, the better the performance

Geometric dimensions

The marking of fans of this type is based on the diameter of the inlet and outlet. Standard size for this parameter: 100 mm, 125, 160, 200, 250 and 315. Duct fan for exhaust 100 and 125 mm are classified as household.Inline fans 160 and 200 mm are more often installed in restaurants, cafes, large-scale shops and other establishments. The rest can be attributed to industrial models that are mounted in the air exhaust system of production shops. All of them are powered by 220 V electricity.

For example, let's take a look at devices of the VKK brand (round duct fan), the photo and table below show its dimensional parameters.

Dimensional dimensions of the duct fan

Criteria for choosing a fan in the bathroom

Purchasing a fan bathroom with check valve should be considered - when choosing, you have to take into account not only the design and color of the device. No less important technical characteristics

Consider further what parameters you should pay attention to before buying

The level of moisture resistance of the device

The bathroom or any other sanitary and hygienic room is characterized by high humidity, water splashes and steam generation. For electrical appliances, such an environment is considered aggressive and dangerous.

Only certain types of equipment with a high level of moisture resistance can work in such difficult conditions.

Information about this parameter can be found on the product packaging or in the technical documentation - degree of protection IP. The device with the highest performance will be the safest and will not fail even if condensate and moisture accidentally get on the working elements.

If hosts like to sit in the bath for a long time or regularly take very hot showers, fans with good heat resistance should be considered. They will easily withstand high temperatures and will not crack under the influence of vapors.

Optimum fan power

Power is another important characteristic that requires special attention. It shows the level of efficiency of the device and makes it possible to understand how quickly the fan will clear the room of unpleasant odors, dampness and mustiness.

For spacious sanitary and hygienic areas, it is better to take the most powerful device. A small hood simply won't do the job, and the owners won't see the desired result.

We discussed in more detail the criteria for choosing a fan in the bathroom in the next article.

The more powerful the motor, the louder the exhaust fan will make during operation. The owners of large houses will not notice this, but for the owners of small apartments this moment will be very noticeable.

Price and product warranty

It is better to buy devices not in the market, but in specialized stores or at points from official representatives. They will not only tell you how to use the device correctly, but also write out a warranty card for service at a certified service center.

As for color, the choice here is not so rich. If you want to buy not a traditional snow-white product, but a colored one, you will have to limit your choice to just a few models.

The majority of manufacturers do not produce bathroom hoods in different shades, considering this unprofitable and burdensome.

The cost will depend on the popularity and promotion of the brand. For a model from European manufacturers, you will have to pay much more.

Domestic units will cost a smaller amount, but in terms of quality they are almost in no way inferior to foreign modules.

Do you need a fan in the bathroom, but its noise and the presence of a non-return valve do not matter to you? In this case, we recommend that you familiarize yourself with the rating of the best bathroom fans.

Manufacturers

Maico is a company headquartered in Germany and known all over the world. The technique she creates is simple and of high quality. Today there are more than one and a half thousand items of climatic equipment for a variety of purposes.

Soler&Palau is an Italian company that specializes in the production of silent fans. Promptly implements the latest innovative developments. The products have some of the best performance among low-noise ventilation devices. The best Soler & Palau model is SILENT-100, it is designed to process 98 cubic meters of space, the power is 8.1 watts. Noise is reduced to a minimum threshold of 25 decibels.

Elicent represents the interests of Maico in the Apennine Peninsula, is identified as a subsidiary. Simplicity of product designs, reliability and low price - these are the parameters that favorably distinguish the equipment of this manufacturer. The company is able to adequately compete on an equal footing with the most eminent global brands. Vents is a Russian company that has been operating on the local market for a quarter of a century. It has a lot of independent know-how of technologies that will allow it to emerge victoriously from the toughest competitive battles with honor.

Vortice is another Italian company that has focused on equipment reliability and safety. It is also distinguished by the original design of many products.

The cost of the product depends on many factors:

• size;
• power;
• body material.

How to choose an exhaust fan for the bathroom

The main technical characteristics that guide the choice of a bathroom fan are: power, performance, air exchange and noise level. The ratio of quality, functionality and cost of the device is also taken into account.

Performance

This indicator depends on two factors: the volume of the room and the number of air changes per unit of time (per 1 hour). The performance of the electric fan is calculated as the product of these figures. The volume of a room is calculated by multiplying its area by its height, rounding up the result. The air exchange rate, in accordance with building codes, ranges from 6 to 8. If the bathroom is used by 1 to 3 people, the rate is taken equal to 6, if more - then 8. Experts advise choosing a fan in such a way that the performance declared by the company is by the manufacturer, was slightly more than the calculated one. On average, hourly productivity is from 95 to 100 m3.

Noise level

During the operation of the ventilation device, there are two types of noise:

• aerodynamic;
• mechanical.

The latter penetrates into the room, spreading through the duct. The source of aerodynamic noise is the vibration of structural elements: the air duct itself and the walls of the protective casing. If the noise level exceeds 35 dB, it has an irritating effect. Therefore, you need to choose a fan so that the noise level does not exceed 30 dB. If you plan to turn on the device at night, then the noise should not be more than 25 dB. You can solve the problem by using soundproofing in the arrangement of the bathroom.

Safety

Another important factor when choosing is the degree of protection of the device from moisture. Contact with water on unprotected components is fraught with a short circuit and ignition of the wiring. To avoid this, it is necessary to look for fans designed for bathrooms (this can be understood by the corresponding marking). In addition, the most common operating voltage for safe fans is 24 V. Even if there is a short circuit, the life of a person in the bathroom at that moment will not be in danger.

Functional

If you still have not decided which brand of electric fan you need to purchase, pay attention to the functionality of the device. There are 2 types of bathroom hoods: standard and automated

The principle of operation of standard devices is extremely simple: the hood starts working at the same time as the light is turned on. It's convenient, but not very practical. Such a fan does not have time to remove all the moisture in a short period of time.

Automated devices are more functional. At the same time, they are more perfect, because they are equipped with special timers. The hood continues to work for about half an hour after the bather leaves the bathroom, then turns off. If the device is equipped with a humidity sensor, it will automatically turn on if its level exceeds the specified limit. Shutdown occurs after a specified time period.

Installation method

There are built-in, overhead and ceiling devices. The built-in version is especially in demand. Such devices are inconspicuous, functional and easily integrated into the ventilation duct.

Diameter

Its value ranges from 80 to 200 mm.The diameter of standard air exchangers is a multiple of 20. It is advisable to choose a device with a smaller diameter so that you do not have to break the wall. You need to choose a corrugation of a suitable size, place a fan in it, and fill the remaining void with construction foam.

Fan type

Axial electric fans (with air circulation along the axis) are more suitable for domestic use. Centrifugal type devices are more powerful and are designed for industrial premises.

Which fan is better to choose

Before buying a ventilation device for your home, you need to know what parameters you need to pay attention to. So, the advice of experts when choosing household fans:

So, the advice of experts when choosing household fans:

Blade size. The optimal diameter is recommended from 10 to 15 cm, while they should be protected by a screen with small holes.
Power. The higher this indicator, the more volume this device can handle.
Noise level

You should especially pay attention to this parameter when buying cheap models.
Functionality. Most fans perform additional functions such as ionization, heating, they also have a timer, remote control and more.
Control

Sensor or push-button navigation.
ventilated space. The largest area for such cooling devices is 50 m
2

Angle of rotation. Many models have a tilt angle of 45-360 degrees.
Modes. Different speeds during the movement of the air flow are very important, as this creates comfort while being in the room.
Location of fans. According to the location, the devices are window, wall or ceiling.

Let us consider in more detail which models are best suited for the bathroom and kitchen.

Kitchen

Kitchen hood fans must have high power, able not only to renew the air in the kitchen, but also to withstand high temperatures. Such a suitable device is the Wolter KA KATD 225-4 Stb.

At the same time, the appliance for extracting hoods in the kitchen has the following parameters:

• productivity - 2,700 m³ / hour;
• noise level - up to 25 dB;
• engine power - 760 W;

And also for kitchen fans it is characteristic that they can withstand the temperature of moving air up to 95 degrees.

bathroom

An ideal option when choosing an exhaust device for a bathroom would be a device with an installed humidity sensor. At the same time, the SILENT-100 CHZ model from Soler & Palau is especially popular.

It is most positively evaluated by domestic users for the fact that it has:

• low noise level in operation (up to 24.5 dB);
• long service life;
• has a large capacity (95 m3 / h);
• built-in timer;
• relatively low power consumption (80 W).

But for a bathroom with a large area over 5 m

2

there must be sufficient exhaust air, so you need to choose a more efficient fan. Such is the device EAF-150 from "Electrolux".

It is distinguished by the following characteristics:

• productivity - 320 m³ / hour;
• engine power - 250 W;
• noise level - 22-25 dB.

You can select the desired mode for it by reinstalling the jumper located inside the timer box.

The exhaust device for the kitchen and bathroom will have advantages if all parameters are correctly selected.And then this multifunctional device will create comfort and a pleasant microclimate in the room.

VENTS 100 Quietline

VENTS 100 Quietline

2. VENTS 100 Quietline

The strength of this device is considered to be its noiselessness (25 dB) - it is not audible even in complete silence. Productivity - only 100 m³ / h, which, with low power, is suitable only for a small bathroom. In such conditions, he does an excellent job with his work, users note durability and no problems during operation.

Advantages

• Doesn't make noise
• Works well
• Compact
• Low power consumption

Flaws:

• Unfortunate location of the electricity supply (to the center of the fan), many complain that they have to drill an air duct
• No extra features
• Not suitable for large bathroom

Fan review VENTS 100 Quiet

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