How to choose an exhaust fan according to the volume of the room?

Living in a modern apartment without ventilation will not just be uncomfortable - it is simply hard to imagine. Ventilation systems are impossible without fans. They can vary greatly in a variety of ways, including power. How to choose an exhaust fan according to the volume of the room? We will discuss this now.

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Where is the fan most needed?

In a small private house, it is quite possible to do without forced ventilation - windows and doors provide an adequate flow of fresh air. But this can not be said about city apartments. Air circulation is especially important where there is high humidity:

• in the kitchen;
• in the bathroom;
• in the toilet.

What will happen if these rooms are left without air exchange? Condensation will appear on the walls, and in large quantities. As a result, in a few weeks all corners will grow moldy. Only good circulation can help out, thanks to which the exhaust air will go away, and fresh air will be in the room. But this will work out only in one case - if you choose the right exhaust fan according to the volume of the room and other parameters. The fan should not be:

• too weak;
• too powerful.

Important! A weak fan does not provide sufficient airflow. Oddly enough, too powerful a device is also bad - drafts will appear, but not everyone can tolerate them well.

So the question of how to choose a fan for ventilation is not as simple as it seems.

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What kind of fans are there?

Fans are divided by the following parameters:

• appointment;
• design features.

There are units designed for industrial buildings. They are very powerful and provide airflow to huge workshops. Home appliances - more compact, give less power. Of course, they are also used at enterprises - in offices, bathrooms and other small rooms.

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Design Features

When deciding how to choose a fan for the hood, keep in mind that according to their design features they are divided into three types:

• axial;
• centrifugal;
• channel.

Axial

Such units are usually purchased for residential premises with an exhaust ventilation device. They are efficient, powerful enough and easy to install.

Centrifugal

This type of device is designed for large systems that allow air circulation in industrial buildings. In everyday life they are often called “snails”. For apartments, they are not very suitable because of the large size.

However, now it is already possible to meet "snails" installed in residential buildings - mainly in bathrooms. True, this is a rather expensive pleasure. You will have to pay three times more for such an apparatus than for an axial one. How successfully it will work depends on the size of the blades and their shape.

Channel

Such devices are placed directly in the duct. They come in different sizes and are oriented to different sections:

• round;
• rectangular.

Such devices have very useful additional features:

• humidity sensor;
• shutdown indicator.

Important! They are placed not only in apartments, but also in swimming pools, saunas and other rooms. A moisture protective cover is provided for this.

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Where will he be?

Household fans differ in the place of installation. They may be intended:

• for the bathroom;
• For bathroom;
• for kitchen;
• for rooms.

They have a different device:

• with check valve;
• with ventilation grill.

Important! In kitchens and bathrooms, devices with a non-return valve are installed; they are specially designed for such rooms. Such a valve allows the exhaust air to clear and return to the room. Systems with ventilation grilles are best placed in rooms, then the exhaust air from the toilet will not get to the neighbors.

In addition, fans are divided by the place of attachment:

• window;
• wall mounted;
• ceiling.

Important! On sale you can find high-temperature fans - it is best to put them in the kitchen, although they are often installed in saunas.

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Additional differences

There are devices that have features that do not allow to separate them into a separate class, but important. Fans are:

• silent
• resistant to corrosion;
• protected from sparks;
• designed to remove smoke;
• dusty;
• inkjet.

Important! Silent are most often axial, and it is they who are placed in apartments. As for the other qualities, they are more relevant for industrial units, each of which may have an additional task - for example, removing dust or smoke from the tunnel.

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How to choose a fan for the house?

To choose a ventilation device for the home, you need to consider several criteria:

• performance;
• multiplicity;
• noise level;
• degree of protection against moisture;
• level of protection against heat;
• dimensions;
• design.

Performance

This is the most important indicator.

First way

It is considered by the formula P = K * O. The following notation is used in the formula:

• P-performance;
• K is the multiplicity;
• About - the volume of the room.

Multiplicity is a constant indicator. It is indicated in normative acts, in particular, in SNiPs. But the volume needs to be calculated. However, this will not be difficult - just remember the school curriculum in mathematics:

1. Measure the length, width and height of the room.
2. Multiply what you have.

Important! To the productivity calculated by the formula, add another 10-15% - this is an error.

The second way to determine performance

In this case, the multiplicity indicator is also taken, but the exhaust fan is selected not by the volume of the room, but by the number of people who are constantly in the room.

The formula looks like this: P = K * L, where P is productivity, K is the multiplicity, L is the number of people.

Multiplicity factors for different rooms

Of course, in a bakery or a greenhouse, the coefficient of multiplicity will differ from that in the bedroom or even in the kitchen. Therefore, different standards are established:

• a bakery - 25-30;
• hairdresser - 3-6;
• restaurant - 6-10;
• office - 6-8;
• hospital ward - 4-6
• bath or shower - 10-15;
• toilet 3-10;
• kitchen in the apartment - 6-8;
• bedroom - 2-4;
• living room 4-6.

Noise level

During operation, any device of this kind emits some noise. The smaller it is, the more comfortable the inhabitants of the apartment will feel. There are two types of noise that come from fans:

• mechanical;
• aerodynamic.

Mechanical occurs from friction of the blades, vibrations, and also in the event that some parts are poorly fixed. Aerodynamic appears when air moves between the blades or through ducts. Its level for residential premises should not exceed 25 dB. In the kitchen, bathroom and toilet, the noise may be higher - up to 35 dB.

Important! To reduce noise, an insulating box and special silencers are provided, but only in overall models.

Moisture protection and heat resistance

These options are especially important if you are choosing an exhaust fan for your bath or sauna. It is especially important to protect the contacts from moisture, otherwise - a short circuit may occur with all the consequences.

For an ordinary apartment, such an indicator as heat resistance is not particularly important.But then the devices that are installed in saunas, steam rooms and other rooms with special climatic conditions must necessarily be resistant to very high temperatures.

How comfortable is it?

The installation of a duct fan for the hood is usually entrusted to specialists, but you will have to operate the device without assistance. Therefore, it should be convenient. Different options are possible:

• with autonomous inclusion and switching off;
• a fan that turns on with the light;
• fan with humidity sensor and automatic shutdown.

Important! The first type is independent of other systems. Using a mechanical lever or touchpad, you turn it on or off when you see fit. The most economical option. Models that turn on with light absorb slightly more electricity than stand-alone ones. The most rational devices with sensors, but they are somewhat more expensive than others.

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What do manufacturers offer?

Manufacturers of household appliances give their customers the opportunity to choose an exhaust fan in terms of volume and purpose of the room.

Overhead

Wall mounted fans are suitable for bathrooms and toilets - the area of ​​these rooms, as a rule, is not particularly large, and such a design can significantly save energy. Mounting such a device is very simple, part of it is installed in the ventilation duct, the second remains outside and closes with a grill.

Window devices

The window fan is placed in the window. Sometimes they are mounted in a wall hole - where it is. If you decide to put one in an apartment with plastic windows, make sure that it is mounted in a double-glazed window, while it is not yet installed in the window opening.

There are several types of such devices by type of profile. It can be round or square. The first option is usually done with a check valve.

For kitchen

The kitchen fan is put in the hood. This is where the question arises of the degree of heat resistance. The kitchen, of course, is not a sauna, but the temperature can also be quite high, especially if you like a stove or you have an electric oven with a pyrolysis cleaning system. It is also important that the fan has a mesh that prevents soot and grease from getting onto the blades.

Important! If you opted for an axial model, please note that the device must be disassembled so that it is easier to clean.

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Stock footage

In this article, we examined various types of exhaust fans, and found out which model is best suited for a particular room. Use this knowledge and advice so that your home is always comfortable and cozy.