The formula for calculating the power of a kitchen hood. How to calculate the hood power for the kitchen

The kitchen is a special place in the apartment. Here, not only the hostess spends a lot of time preparing delicious and healthy dishes. The whole family also often likes to gather here, in warmth and comfort.
But if the room is filled with smoke and fumes, which also begins to penetrate into other rooms, there is no time for comfort!
Such a useful device as a hood helps to avoid such trouble. However, this only happens if its power is selected correctly.
Let's figure out how to calculate it yourself.
But first of all, let's clarify the basic information about exhaust devices. We need it to perform accurate calculations.

The peculiarity of the exhaust device for the kitchen

Features of the kitchen hood

Manufacturers offer several types of devices that make the air fresh and clean.
The main difference between them is related to technological features. Namely, with what happens to the dirty air that has entered the hood housing.
There are currently 2 types of devices in use.

Supply

Reference. These are powerful devices that are able to quickly and efficiently remove contaminants.

They are carry out the removal of dirty air from the kitchen. Most often, it goes to the supply ventilation, which is available in the apartment.

The movement of air occurs inside a special channel - an air duct. It combines the housing with the ventilation duct.

Exist 2 types of air ducts

• First option - flexible, corrugated channel. It is usually used if an air duct with turns and corners is mounted.
• Another variant - use of hard plastic. Such an air duct is installed if the hood and ventilation are connected in a straight line that does not have any bends.

Recirculation

These are hoods that do not have access to ventilation.

This feature of the devices is related to the principle of their operation. Aggregates they do not remove dirty air, but purify it and then return it to the kitchen again.

The absence of a ventilation duct led to the need adding another component to the design - one or more filters.

Reference. The power of recirculation hoods is usually somewhat less than that of supply structures.

Hood installation requirements

For the quality performance of their functions units must be properly installed.

The place for them is associated with the location of the cooking device: electric or gas stove (panel). The hood is installed directly above them.

Important: The width of the hood must not be less than the width of the hob.

It is not allowed to place the stove and hood in different places in the kitchen.

Regardless of the principle of operation and power, exhaust devices can be mounted on the wall (flat, dome), on the ceiling (island), in a closet (built-in).

An important factor when choosing a place is the convenience of connecting the structure to electricity.

This information will help you decide which appliance is best for your kitchen.

Power is an important device selection parameter

Having decided on the type, design, features of operation and mounting of the unit, you must not forget about its power.

What is hood power

In physics lessons at school, we were taught that the concept of power indicates the speed of transformation, the performance of the main function of the device.

What does this mean in relation to the hood? Since the purpose of this household appliance is related to air purification, we will be able to determine what its power is. Therefore, the unit of measurement of this indicator was m³ / h.

Power is also referred to as device performance.

Do not confuse this figure with energy consumption data, which is also called power in some cases. The fact that these are different characteristics can be seen by comparing the units of measurement. Electricity consumption is measured in kWh.

What power do modern hoods have

Depending on specific needs, customers can choose home appliances with different capacities.

• low power units are produced with a capacity from 25 cubic meters / h. This group includes equipment with characteristics up to 150-200 m3/h
• Average power expressed in terms from 200 to 450 m3/h. Most devices have a capacity of 300 to 400 cubic meters / h.
• Powerful Devices- these are extracts that process from 500 to 750 m3/h.
  The productivity of industrial machinery is even higher. It reaches up to 900 m3/h.

Reference. Modern devices provide the ability to adjust the power and speed of air purification. They have up to 5 power levels.

Data required for power calculation

So, we have clarified what is included in the very concept of power. We also found out that we have great opportunities for choosing an exhaust device of suitable performance.

Important! A small area of ​​\u200b\u200bthe kitchen is not a reason to purchase equipment of minimum power.

But that only makes things more difficult! How to choose the most suitable from a large number of devices?

The answer is simple: for each specific kitchen, you will have to calculate the optimal hood power. And then it remains only to purchase the device according to the calculated data.

Sanitary standards

The calculation can only be correct if all the necessary data are used.
First of all, they include sanitary standards. They are established by law.

Reference. In accordance with the requirements of sanitary rules and regulations in the kitchens of residential buildings, the air must be completely updated 12 times in 1 hour.

Let's remember this number. We need it for calculations.

An air turnover coefficient of 12 applies to all residential premises, regardless of their area and location (apartment building or individual building).

Formula

Let's move on to further calculations. They must be accurate, so mathematics is indispensable here.

Calculations are carried out according to the following formula: S x H x 12 = P.

For the calculation, we need the following data:

• Square kitchens - S.
• Ceiling height– H.

As a result we we get the required performance indicator (P).

As you can see, there is nothing complicated. By multiplying the area and height of the room, we first find out the volume of the kitchen in cubic meters. And then we increase the result using the sanitary coefficient.

Reference: the area is calculated by multiplying the length and width of the kitchen. Ready data can also be taken in the technical passport of the apartment.

This determines the overall power of the device. However, this figure is not final.

3 counting methods

You can find out what the performance of a structure that works in your kitchen should be in different ways. Let's imagine 3 main ways that consumers are recommended to use.

According to the table

Since we find out with this formula maximum performance hoods, which means that you will always have to use them to the maximum. How will this affect the device? It can be assumed that such functioning will not have the best effect on its long-term.

So, you need to buy a model more powerful than the data obtained. Therefore, the calculations include a certain margin of safety, expressed as a factor of 1.3.

Getting a result

For simplicity You can use ready-made tables, which are compiled using an average magnifying factor of 1.3.

This is the easiest way. In the left vertical column we find the desired area, in the upper horizontal - the height of the room. At the intersection of the horizontal and vertical lines we find our data. The margin of safety is already taken into account in them.

Subject to specific conditions of use

To obtain a more accurate result, you need to pay attention to the specific conditions of the room in which the structure will be installed.

Additional factors affecting the power of the hood

And in order to most accurately combine the exhaust device with a specific kitchen, you need to add additional information to the calculations.

Odds for different panels:

• gas - 2.0;
• electric - 1.5.
• models with an air duct - 1.3.
• models with a filter - 1.7.

The largest coefficient is entered into the formula.

So, if the surface is gas (2.0) with a filter (1.7), we apply a coefficient of 2.0.
And if the panel is electric (1.5) with a filter (1.7), our coefficient is 1.7.

Important! If there are smokers in the family, the power must be increased using an additional coefficient of 1.3.

Calculation examples

For example, let's make a joint calculation for different areas of kitchens.

9 sq. m

Initial data

• Ceiling - 2.5 m.
• The panel is gas (2.0), with a filter (1.7), therefore, our coefficient is 2.0.

9 sq. m x 2.5 m x 12 x 2.0 = 540 cu. m/h.

10 sq. m

• Ceiling - 2.7 m.
• Electric panel (1.5) with air duct (1.3) - increasing factor 1.5.

10 sq. m x 2.7 m x 12 x 1.5 = 486 m3/h

12 sq. m

• Ceiling - 3 m
• Electric panel (1.5) with filter (1.7) - coefficient 1.7.

12 x 3 x 12 x 1.7 = 734 m3/h

15 sq.m

• Ceiling - 2.7
• Electric panel (1.5) with air duct (1.3) - coefficient 1.5.

15 x 2.7 x 12 x 1.5 = 729 cbm/h

Third way

Experts offer another simple way, which is the most common.

It is associated with an increase in the air turnover ratio.

According to this methodology, instead of multiplying by 12, another factor is applied.

• Electric stoves - 15.
• Gas surfaces - 20.

Calculation examples

Let's see what results we get in our examples.

9 sq. m

Initial data

• Ceiling - 2.5 m.
• The panel is gas.

9 sq. m x 2.5 m x 20 = 450 cu. m/h.

10 sq. m

• Ceiling - 2.7 m.
• Electric panel.

10 sq. m x 2.7 m x 15 = 405 m3/h

12 sq. m

• Ceiling - 3 m.
• Electric panel.

12 x 3 x 15 = 540 m3/h

15 sq.m

• Ceiling - 2.7 m.
• Electrical panel

15 x 2.7 x 15 = 607 cbm/h

As you can see, this simplified calculation gives slightly different numbers.

They can be used for orientation as a minimum power indicator that a kitchen hood should have.

We hope that the question of which hood to choose will not be too difficult now. You can purchase a unit that will not only fit perfectly into the interior, but also cope with its purpose. With the right selection of appliances, you will always be able to keep the kitchen fresh air.

Dinner has long been eaten, and the smell of food is still in the air? It's time to find out how to choose a hood for the kitchen in terms of power. A new household appliance will prove to be a faithful assistant to the hostess. With it, you can forget about drops of fat, fumes and unpleasant odors.

Modern household appliances have a lot of parameters. The main criterion when buying an exhaust system is its performance: the more powerful the equipment, the cleaner the air during cooking. Separate points should highlight the functionality, principle of operation, dimensions and the presence of additional elements. Before making your choice, it is worth understanding all the nuances of the device.

Principle of operation

Depending on how the air is cleaned, hoods are:

• circulation;
• flowing.

In the circulating mode, the air passes through the purification system and returns back to the room. A variety of filters hold back dust, grease and soot. The fine cleaning function eliminates unpleasant odors. This is also a disadvantage of the device: a large number of filters creates air resistance, which reduces performance. Charcoal filters cannot be cleaned and will need to be replaced over time.

Circulating hoods do not require an air duct. They are inexpensive and easy to install. Unfortunately, they are the leader in terms of noise performance.

For flow systems, an air duct is required. They suck up contaminants with a vent to the ventilation. Installation of pipes or corrugations is carried out during the installation of the device itself. Inside the hood there are metal filters on which all the soot settles. Wash them periodically in warm soapy water. Such systems are highly productive.

Type of shell

In a small apartment, hanging hoods are most often installed. They fit into any interior. The suspension system is characterized by low cost and fast installation. It is installed above the stove, the body can be hidden under the front of the cabinet. The only drawback is the weak power.

A chimney or dome hood is also easy to install yourself. There are many design options. The price range is wide, you can find a budget option. The dome system is characterized by high performance.

The built-in model is installed inside the kitchen set, making the body invisible. Some appliances have a retractable panel that increases the air intake area. The appliance can be installed in a kitchen of any size.

The wall model has a large size. She looks like an umbrella. Such a hood cannot be hidden behind the facade of the headset. You will have to choose a model that fits perfectly into the interior.

The island system is designed for kitchens in which the stove is located in the middle of the room. The duct is also a supporting structure. This model is attached to the ceiling. You can choose a kitchen appliance suitable for any style: from retro to hi-tech.

Dimensions

Before visiting the hardware store, you should measure the stove. You need to know its length and width. The hood should be slightly larger in width to absorb all the dirty air. Most often, the dimensions of the devices vary from 45 to 90 cm.

Take into account the height of the mount. For gas stoves, the exhaust system is mounted at a height of 70 cm, and for electric ones - 80. In order to correctly select the size of the case, it is necessary to take into account whether air will escape from the working area. The design of modern models is well thought out: there is no need to be afraid that the hood will look bulky.

Filtration system

Particles deposited on the pipe walls create a favorable environment for pathogenic microorganisms. Filters trap and eliminate unpleasant odors. Grease filters prevent large particles from settling on machine parts. Without such a barrier, the engine will quickly fail.

The fine filter is based on activated carbon. It absorbs odors, vapor impurities and harmful compounds. Filters are a cassette with an adsorbent inside; differ from each other in shape and size. They are changed as they get dirty.

Extra options

There are a number of secondary functions that make the hood more convenient and ergonomic. It is advisable to pay attention to:

1. Noise level. So that the kitchen appliance does not distract, you need to choose a hood with characteristics of no more than 45 dB.
2. Backlight. Facade lighting will make cooking even more comfortable. Choice of halogen or LED bulbs.
3. Control. Distinguish between push-button and touch control. Expensive models are equipped with a remote control.
4. Material. Hoods of the budget segment are made of painted metal. Slightly more expensive stainless steel. Tinted glass is a highly valuable material.
5. Emergency indication. Some models can turn off on their own if there is a risk of ignition.
6. Work after shutdown. When finished, the fan runs for a while, sucking in the remaining fumes.
7. Automatic switching of speeds. If the smoke becomes greater, then the sensor will select the appropriate fan speed.

How to choose a hood for the kitchen by power

External data and additional elements are not the main indicators. In the first place are technical data and volumes of purified air. The performance of the hood is calculated in cubic meters / hour, and the power consumption is in kilowatts spent on the operation of the device. In an hour, the equipment must update all the air in the room at least ten times.

The power of the hood depends on its performance. The more powerful the fan, the more air will drive through the hood. The traditional power calculation is created for circulating models. The performance formula is simple.

It is necessary to multiply the area of ​​\u200b\u200bthe kitchen by the height of the ceiling and by a factor of 12. If a gas stove is installed in the house, then the coefficient is changed by 20. The last figure is the sanitary standard for absorbed air cubes in residential buildings. A 20% power reserve is added to the finished value.

This formula will calculate the ideal conditions for:

• kitchens with small electric stoves;
• enclosed spaces;
• small rectangular room.

If an arched opening is installed in the room or the door is always open, then calculations are made based on the area of ​​\u200b\u200bthe corridors.

Devices with an exhaust system need to calculate the cross section of the duct. In panel apartments, the cross section of the ventilation ducts is 12.5 cm. This is enough to drive about 400 cubic meters of air. A hood with a higher performance will not cope with its task.

Technology with high power has a significant drawback: a high level of noise. Most models have asynchronous electric motors that are quieter than other household appliances. But if you turn on the hood at full power, the noise will cause discomfort. In a house where there are small children, it is better to install a quiet device. Inclined models have a reduced noise level and high power.

Rating of the most powerful kitchen hoods

The modern home appliance market offers a wide range of range hoods. The budget segment is not inferior in the range of expensive brands. The list of popular models will help you make the right choice based on the parameters of the device.

The stainless steel island hood has a futuristic design. Allows to work both in the mode of removal of air, and in circulating. The grease filter is made of aluminum, it perfectly retains soot. Halogen lamps illuminate the work surface well. Its versatile appearance allows it to be placed above an island or against a wall. The powerful motor of 35 kW works silently. Button control allows you to select one of three speeds. The capacity is 1050 m3/h, which will clean the air in a large kitchen. The noise level is very low. Charcoal filter not included.

The island type hood is available in two colors: white and black. The metal body is easy to clean from dirt. Productivity of the device makes 1050 m3/h. Touch control includes a timer function. 4 LED lamps make the cooking process more comfortable. The hood operates in two speed modes. The maximum width of the hob at which the appliance will function normally is 90 cm. With a high motor power, the maximum noise level is only 49 dB.

Quiet inclined hood has an original appearance. A high level of performance allows you to absorb even the most caustic odors. It has four modes, the highest of which removes polluted air in minutes. The aluminum filter retains soot and grease. The workplace will be illuminated by two bright lamps. The touch buttons are protected by glass, which ensures flawless gear shifting. The noise level in turbo mode is 59 dB. The timer for 15 minutes sucks up the remaining odors after the end of the hob.

The most powerful island hood on the list. Completely eliminates combustion products, grease and soot. The built-in diffuser suppresses noise and ensures efficiency even with a problematic duct. It is possible to install additional cleaning filters. The model provides 3 high-speed modes. The maximum noise level is 68 dB. The design allows you to harmoniously fit the hood into any interior. Halogen lamps illuminate the hob. The glass surface can be used as a shelf for the necessary things.

Budget option for a fireplace hood. The body is made of stainless steel. The power is 310 watts. Two decorative boxes allow you to install the hood exactly in height. High performance allows you to clean the air even in large rooms. Light sources are located in front of the device. The keypad includes one of three speeds, there is a timer. The grease filter protects the internal parts from evaporation, the carbon filter is purchased separately, it lasts for about six months.

The kitchen hood is not a tribute to fashion, but a necessity and a manifestation of care for the family. Vapors of liquids, detergents and drops of vegetable oils pollute the air of the apartment, furniture, ceiling. After cooking delicious food, you have to start cleaning. You should choose the hood for your kitchen in terms of power so that it copes with the tasks. The correct calculation of performance will make it possible to buy a quality model. In all other respects - design, color, body type and lighting, you can safely rely on your taste.

When choosing a ventilation device, people often pay attention only to the design of the unit or the brand. But they forget about the most important parameter - this is the power of the hood for the kitchen (performance). Without the correct selection of this parameter, even the most beautiful unit of a well-known company will not be able to cope with its task - to effectively purify the air in the room. The performance indicator determines how much polluted air the device can pass through itself in a certain time, it is measured in m 3 / h.

The higher the power of the unit, the faster the air in the kitchen will be cleaned. Performance can be quickly calculated from the table below.

At a minimum, industrial kitchen ventilation devices have a capacity ranging from 200 to 300 cubic meters per hour. The cost of such models is low, and they cope with their task with difficulty. You can install low-power devices only in small rooms, provided that you do not cook very often. For frequent cooking, it is recommended to use standard installation(capacity - about 600 cubic meters per hour), or with increased pumping volume - about 1000 m 3 / h. Accordingly, the price of such devices is higher.

Power calculation

To calculate the performance of the hood, you first need to understand what functions the device should perform. According to the instructions, this device should purify or remove polluted air in the kitchen. According to sanitary standards, 12 air replacement cycles must pass within one hour. That is, he must change indoors 12 times in 1 hour. Now you know where the coefficient “12” comes from in the formulas for calculating productivity.

The formula itself looks like this: Q=S*H*12, where:

• Q is the power of the unit, which is measured in m3 / h;
• S is the area of ​​the room for which ventilation is needed;
• H is the height of the room;
• 12 is a coefficient indicating indoor air replacement cycles.

For example:

• room area - 12 m 2;
• height - 2.7 m;

We substitute the values ​​into the formula: Q=12*2.7*12=388.8 m3. Based on this calculation, the device will produce such a volume, only using the maximum performance. It will not survive this mode for a long time and may fail.

This creates a small power reserve for a kitchen hood, facilitating the operation of the appliance. And for you, it is possible to turn on the maximum mode only during a large smoky room, for example, on the eve of the holidays, when a large number of dishes are being prepared.

It should be noted that all these calculations for the volume of air exchange have averaged indicators, since various nuances are not taken into account:

• type of hob;
• room layout.

hob type

The type of stove determines how much pollutants can be released into the air during cooking. And updating it, respectively, should occur more often or less often. The update factor must also be changed. The calculation of power for the kitchen at differs from the standard one, since no combustion products enter the air, except for fumes from cooked food. The coefficient for such slabs can be increased from 12 to 15, and the formula will look like this: Q=S*H*15.

Extractor hood over electric stove

When you are going, the coefficient should be increased to 20. This is done so that in addition to fumes from cooked food, a large amount of harmful gas combustion products enter the atmosphere. In this case, the formula is written as: Q=S*H*20.

Hood over gas stove

Hood type

The units differ in the mode of operation, namely, where the passed air is discharged. There are 2 types of devices:

• ventilation;
• recycling.

Devices means connecting it to ventilation channel in the house, for the removal of exhaust gases to the outside. But before calculating the power, the bandwidth of the channel must be taken into account. If the house is old and the ventilation shaft is clogged, then even though you buy a powerful hood (according to the calculations), it will not be able to remove the air at full strength. And to the neighbors in the riser, exhaust gases from your kitchen will be blown into the room. In such cases, you can do separate exit for ventilation to the outside by making a hole in the wall.

Devices contains in design filter system and does not require connection to the ventilation shaft. In most cases, cleaning occurs in 2 stages. First, the first filter absorbs large particles: steam, grease and fumes. Then the air passes through a carbon filter, which removes all odors, and flows back into the room.

Filters can create some resistance during pumping, which also needs to be taken into account when calculating the performance of the hood. The recommended increase in this value for such devices is approximately 30 - 40%.

Room layout

When calculating the ventilation performance, the layout of the kitchen should be taken into account. If, for example, an arch is installed instead of a door, or you are used to not closing the door, then the volume of the adjacent room should also be taken into account in the calculations.

If kitchen combined with dining room or living room, then the requirements for calculating the performance of the device increase significantly, due to the rapid spread of odors that must be effectively removed.

Noise level

Now that you have calculated the required extractor power for your kitchen using the above recommendations, you should think about the noise that it will make. In a store, when choosing a device, you are unlikely to be able to assess the noise level of the device due to the large size of the room or other noises in the sales area. It will help to correctly evaluate this indicator instruction that comes with the unit.

The more powerful the device, the stronger the sound it makes.

In the instructions, you should look at the sound parameters at maximum load and in the normal mode of the device. If the noise level is in the range of 30 to 45 decibels in standard mode, then the operation of the device will not cause you discomfort. Such hoods can practically be called. When working at maximum, the sound should not exceed 55 decibels. If this indicator is exceeded, then such a device may be suitable only for large rooms. Otherwise, the loud sound will cause discomfort.

Following the above recommendations, you will be able to choose the right hood power for the kitchen. And this, in turn, will contribute to the creation of a pleasant indoor climate and well-being during cooking.

The range of kitchen hoods in the store is amazing. Models differ in size, appearance and, of course, power and performance. It is the power of the hood that is the decisive factor in choosing the right device, since this kitchen appliance is taken not so much for the sake of external beauty, but for the sake of the declared functions.

Types of hoods by design

In appearance and design, all hoods can be divided into several categories:

1. Flat hanging. The easiest and most budget option. Such models do not differ in high performance and are suitable for small kitchens.
2. Embedded. Medium power models that are installed in a hanging headset cabinet. Suitable for small and medium (10–12 m 2) rooms.
3. Dome. They are very popular due to their attractive appearance and high performance.
4. Island. The most powerful models that are installed in spacious studio apartments. Mounted directly on the ceiling, directly above the table located in the center of the room.
5. Fireplace. They resemble domed ones in their appearance, but they have greater performance. As a rule, they are installed in the corner of a large living room or studio.

Types of hoods

The principle of operation of different models

According to the method of air purification, all devices are divided into two categories:

Flow-through flat hood

Some models can work in both modes. When installing them, the owner should determine which option is more suitable for him in a particular situation.

How to correctly calculate the power of the hood for the kitchen

To determine the performance of the device, you should find out what functions it should perform in the house. The instruction manual for the hood says that it should purify or extract polluted air. According to sanitary standards, the air in the room must be completely updated 12 times per hour. Accordingly, the performance of the device must provide the necessary air exchange.

The calculation of the hood power for a standard kitchen, without taking into account complicating factors, is made according to the formula:

where Q is the minimum required device power; S is the area of ​​the room; H is the height of the room; 12 - coefficient of air exchange.

Room volume

Calculation examples

Let's look at examples of how to correctly calculate power:

For calculation, let's take a typical Khrushchev kitchen with an area of ​​​​6 m 2. The standard ceiling height in such rooms is 2.5 m.

The calculation will look like this:

S=6 m 2 ; H=2.5m; Q \u003d S * H ​​* 12 \u003d 6 * 2, 5 * 12 \u003d 180 m 3 / hour

The final figure is the maximum power of the device, which will provide the necessary air exchange.

Consider, for example, a kitchen in an improved-plan apartment. Its area is 9 m 2 , ceiling height 2.8 m 2 .

The calculation will be as follows:

S=9 m 2 ; H=2.8m; Q \u003d S * H ​​* 12 \u003d 9 * 2.8 * 12 \u003d 302.4 m 3 / hour.

It is with such a declared power that the hood will provide effective purification of the air in the room.

It should be noted that the given power calculator is very conditional. It does not take into account many factors: open doors or windows, a set that occupies part of the volume, an abundance of decorative elements, shelves and niches.

Table of calculated power

Accounting for additional factors

When calculating the power of the hood, first of all, an adjustment is made for the type of plate. If a gas surface is installed in the kitchen, during which combustion products are formed, the air exchange coefficient is taken equal to 20.

The above calculation is suitable for a recirculation hood. If the device is equipped with a motor carbon filter, which creates additional resistance, the required performance increases by 25%.

When the door to the kitchen is constantly open, the power of the device is calculated taking into account the area of ​​\u200b\u200bthe adjacent premises.

The performance of flow models depends not only on the characteristics of the device itself, but also on the throughput of the ventilation ducts.

Complicating factors

In addition to these nuances, device performance can be affected by the mounting method and location of the device. Often the hood is located several meters away from the vent and requires the installation of a long duct. To accurately place the pipe over the headset, it has to be repeatedly rotated or bent. With each bend, the speed of passage of air masses decreases. Before finally calculating the hood for the kitchen, it is necessary to add 10% of the performance for each knee, for each turn.

Air duct with swivel elbows

For example, the estimated productivity of the device is 500 m 3 / h. If an air duct is attached to the hood, which will be bent at a right angle twice before it is brought into the ventilation, the calculation will be as follows:

Q \u003d 500 * 1.1 * 1.1 \u003d 605 m 3 / h

The peculiarity of the structure of the ventilation shaft, its pollution and clogging remain hidden from the eyes of the owner of the apartment. Therefore, in the final calculations, a minimum margin factor of 1.3 is used. It compensates for the number of storeys of the apartment, the bends of the air ducts and the permeability of the shaft, which affect the loss of performance of the hood.

Power consumption and performance

When it comes to hoods, buyers often confuse the two. The performance or power of the hood is the volume of air that the device can pass through itself per hour of operation. The unit of measurement is m 3 /hour.

Power consumption - the amount of electricity that the hood motor consumes per hour of operation. It is measured in kilowatts/hour (kW/h).

These features are directly related. The more powerful the motor is capable of rotating the fan blades, the higher the performance of the unit will be.

Relationship between noise and power

Often, buyers ask themselves the question - why calculate the power of the hood, if you can simply purchase a device with maximum performance? The thing is that in such models the noise level is much higher, and they are quite expensive.

Noise levels

Excessive hum during operation will quickly tire the hostess. In some cases, he is even able to drown out the conversation in the kitchen.

The higher the power of the device, the louder the noise it will make. It is rather problematic to evaluate this indicator by ear in a store - the room is large, filters and air duct are not installed in the model, there is always a monotonous hum in the room. All this will lead to the fact that when buying, the hood will sound quieter than in the kitchen. It is worth focusing on the power level, which is indicated in the technical characteristics of the product.

In modern models, the noise level is 30-55 dB, which is approximately the same as human speech. Please note that the volume may vary depending on the selected speed. For example, the noise level of the same model can vary from 31 to 53 dB in different operating modes.

Silent hoods do not exist in principle, but manufacturers are doing everything to reduce this figure to a minimum.

Operating modes

It is almost impossible to meet now devices that operate only at one power (maximum). All manufacturers complete the manufactured hoods with an operating mode switch (electronic or mechanical). It allows you to change the fan speed depending on the needs of the owner.

Standard models come with three speeds. In more expensive ones, their number can reach 5.

Hood control panel

The first speed helps keep the air in the kitchen clean. It can be turned on on an ongoing basis if 1 dish is being cooked on the stove.

If the hostess cooks on two burners at the same time or bakes pies in the oven, it is worth turning on the hood in the second, more productive mode.

The third, maximum mode should be launched if it is necessary to clean the air in the kitchen in a short time, for example, when all the burners are occupied or something is burnt on the stove. To enhance the effect and speed up the odor removal process, you can close the door to the kitchen.

Hood operating modes

At the third, last speed, the hood will operate at maximum power. To extend the life of the device, this mode should be turned on from time to time, and not used on an ongoing basis.

How does size affect device power?

It cannot be stated unequivocally that a model with a width of 60 cm will be more powerful than a model of 50 cm. However, in general, the trend towards an increase in the performance of the exhaust device with an increase in dimensions can be traced. The thing is that wide hoods “collect” air from a stove of a larger surface; it is rather problematic to do this at low power.

Examples of models of different power

Hood MAUNFELD Tower in the interior

Consider some of the most popular models:

1. MAUNFELD Tower C 60 black, capacity 650 m 3 /h. Hood width 93 cm, maximum noise level 54 dB.
2. ELIKOR Davoline 50 cream, capacity 290 m 3 /h. Hood width 50 cm, maximum noise level 52 dB.
3. ELIKOR Saturn 50 with a capacity of 180 m 3 / h. Hood width 50 cm, maximum noise level 48 dB.

Choosing a hood for the kitchen should begin with determining the technical characteristics of the device you like. Many users do not study this issue well enough, paying attention only to the dimensions and design of the device. As a result, they acquire a device that is too weak, which cannot cope with the air masses in the room, or, on the contrary, is too powerful, creating noise and consuming a lot of electricity. To avoid these problems, you need to know how to calculate the hood in accordance with the dimensions and features of the kitchen.

Among the technical characteristics, special attention should be paid to the power and performance of the device. These indicators reflect the volume of air masses that the hood passes through itself for a certain time, as well as the energy spent on this process. If you correctly calculate the volume of air in the room and take into account additional factors, you can accurately determine how long it takes the appliance to fully ventilate the kitchen. This will allow you not to make a mistake with the choice of an exhaust device and subsequently use it as efficiently and economically as possible.
In this material, we will tell you how to calculate the power of the hood for the kitchen so that it successfully copes with the ventilation of the room.

Types of hoods for the kitchen

Exhaust devices are divided into several types according to the method of operation, design and mounting option. The type of device often determines the degree of its performance, therefore, at the first stage of selection, it is worth remembering this pattern.

1. Flow hoods are models equipped with a dome that remove polluted air into the general ventilation system through the chimney. Such hoods can have a fairly high power.
2. Recirculation - compact hoods, the principle of operation of which is to conduct air masses through a system of cleaning filters. These models, as a rule, have less power than flow models, they pass a limited amount of air through themselves.

The rules for calculating performance for different types of hoods are somewhat different. In a recirculation system, the main factor is the power of the motor, and in a flow system, the efficiency of air output to the ventilation shaft.

The formula for calculating the performance of a recirculating hood

The standard calculation of the required performance of the hood for the kitchen is carried out according to the following formula:

where: N is the design capacity, m³/h;
S - kitchen area, m²;
h - ceiling height, m;
12 - adopted by the SES;
1.3 is the minimum stock factor.

Hood performance calculator

• when using an electric stove;
• kitchen with closed doors and windows, separated from other rooms;
• the shape of the room is rectangular.

It is important to note that the calculation formula allows you to find out what volumes of air the device will process at maximum power and speed. Of course, in real conditions, the device cannot constantly operate in the most energy-consuming mode. To get a more accurate result, it is recommended to add 15–20% to the final figure, so you will calculate the performance of the kitchen hood for efficient operation in medium mode.

If a gas stove is used for cooking, then the coefficient 12 should be changed to 20 without hesitation. In this case, in addition to fumes, ventilation will also have to remove gas combustion products from the kitchen. If the design has a carbon filter, it is worth adding 20 to 30%, as it creates additional resistance to the incoming air.

Calculation of the performance of a flow-through exhaust system

The calculation of the exhaust power with an air duct is also carried out by calculating the volume of air masses in the room. However, the performance of such a system is greatly influenced by the throughput of the duct. If the air exhaust duct is not designed correctly, a high power appliance will not work efficiently and may even fail. Frequent problems that arise in this case are a high level of noise and overheating of the electrical parts of the device.

In almost all apartment buildings, air ducts do not exceed 12–13 cm in diameter. Up to 400 m³ of air can be removed through them per hour. This figure should be guided by when choosing a hood for the kitchen - if you buy a device with a higher performance, the power consumption will increase with a slight increase in performance.

An important factor is the length and shape of the chimney pipe. If the exit to the ventilation shaft is too far from the installation site of the hood, and the channel itself has irregularities and corners, the air will pass through it at a lower speed. In this case, the installation of a powerful exhaust device is also unjustified.

Influence of the shape of the hood on the power level

In addition to differences in the way they work, cooker hoods also differ in the type of construction.

1. Dome or fireplace. This design is made in the form of a trapezoid or a cone. Thanks to this device, it creates additional natural draft of air. It can have different power, up to the highest rates.
2. T-shaped. A simplified version of the hood with a chimney, instead of a dome, rectangular panels are used. In a compact form, it can be built into furniture. With a wide pulling surface, it often has a high performance.
3. Inclined. A device with a chimney, the lower part of which is located at an angle with respect to the wall. This shape provides good air draft and saves space. Possesses high and average indicators of efficiency.
4. Wall. A device with filters that purify the air and bring it back into the room. Has no outlet to ventilation. Has an average power level.
5. Hanging or sliding. Convenient and inconspicuous, but inefficient models of recirculation hoods. As a rule, they have low power. Used in small kitchens or when providing an additional ventilation system.

Thus, we can conclude that the best option for spacious rooms is the classic fireplace or T-shaped ventilation, as well as some of the inclined models. They can provide enough power to ventilate the kitchen. In small rooms, you can also install a wall-mounted recirculation model, but in this case, you need to carefully calculate the performance of the hood and the volume of air masses.

Hood dimensions as a performance indicator

When calculating the extractor power for a kitchen, it is logical to assume that the larger the extractor surface of the appliance, the more air it can pass during operation. Accordingly, small (built-in or folding) models of hoods have low performance indicators, and large dome models have the highest ones.

This is the only external factor by which you can "determine" the power of the device by eye. However, today this approach cannot be called correct. Modern hoods can be highly efficient even with a compact design. An example of this is the T-shaped and inclined hoods, which, in the absence of an impressive dome, do an excellent job of ventilating even spacious rooms.

Noise level at different device performance

noise level

When a large volume of air passes through the exhaust ducts, a sound naturally arises, which grows when the motor operates with high power. In residential areas, noise can interfere with a comfortable stay in the kitchen and even penetrate into other rooms. Therefore, it is very important to choose a hood of such power that the noise level during its operation does not exceed the permissible limits.

Small hoods with low power have the lowest noise level - their performance does not exceed 40–45 decibels. This is a fairly comfortable level for the constant operation of the device in automatic mode. However, when choosing such a model, you will have to sacrifice the efficiency of its work.

Kitchen hoods with high power have high noise levels and can create discomfort when working in small rooms. Experts recommend turning on these devices “to the fullest” only in emergency cases, but for daily use, set the settings to average. Then the hood will not make loud sounds during operation.

Features of calculating the power of a kitchen hood

Let's sum up to answer the question of how to choose a hood for the kitchen in terms of power? To do this, you should take into account a number of factors that we have already noted above:

• Calculate the volume of air in the room.
• Knowing the diameter of the duct and its length.
• Having made amendments in accordance with the presence of filtration systems, pipe bends.
• Noting the type of stove and the frequency of its use.
• Determining a comfortable noise level.

In the complex, the calculation of the performance of the hood for the kitchen according to these parameters will provide you with efficient and economical operation of the device. You can read about other features of the choice of ventilation systems in special sections of our website.