The consequences of poor ventilation in the kitchen can be very different - from greasy deposits on the ceiling and walls, due to which repairs need to be done again after just a few months, to permanent feeling unwell, since during cooking you have to breathe air contaminated with harmful impurities.
A properly selected kitchen hood can solve all of the above problems. However, only if its performance meets the required parameters.
What is the performance of the exhaust device? This is the volume of air (in m3) that the device can clean or remove from the kitchen in one hour of operation. Quite often this indicator is called power, but this is not entirely true. Power is the amount of electricity consumed by a device per hour of operation, and it is measured in kilowatts. Of course, the more powerful the device’s motor, the more air it can process, but this rule does not always work. Therefore, it is not necessary to purchase the most powerful model to get the best results.
Before purchasing, many people think about how to calculate a kitchen hood, that is, choose the right performance, power and size. The efficiency of the exhaust device depends on the combination of these factors. If everything is quite simple with the size - it must correspond to the parameters of the working surface, then you will have to work hard to choose a model that fits the other criteria.
To avoid buying just a cute kitchen accessory instead of a functional device, you will have to calculate the performance of the hood before going to the store. To do this correctly, it is necessary to understand in detail the design and operating principle of exhaust devices, as well as derive the calculation formula. All necessary information you will find in our article.
How does a kitchen hood work?
The hood design of any model is not particularly complicated. Her work panel hides a grease filter, which is responsible for rough air purification. The mesh of the filter cartridge traps airborne fat particles. This component is required for any type of exhaust devices. It prevents grease from settling on the internal parts of the mechanism, thereby extending the service life of the device.
Immediately behind the filters there are fans that remove contaminated air through the air duct into the ventilation duct. The fans are connected to motors designed specifically for use in hoods. To make the operation of the device quieter, manufacturers are trying to introduce various innovations, from coating the blades with Teflon to insulating the motor in an individual housing. Sometimes two turbines are installed, operating at lower power and, accordingly, quieter.
If the hood operates in recirculation mode rather than exhaust mode, its design includes another filter - a carbon filter. Its task is fine cleaning and removal of the smallest impurities and odors, since the air flow then returns to the room.
The housing of the exhaust device can be made of the most various materials. Cheap models are most often made of plastic, the main advantage of which is its ease of maintenance. The most durable and durable devices are considered to be made from of stainless steel and aluminum. The use of tempered glass is very popular, which is easily cleaned from any contaminants and tolerates well high humidity and temperature changes.
Having learned how the hood works and works, you will be able to operate the device correctly and provide it with proper care to avoid possible breakdowns.
All models of exhaust devices are designed approximately the same inside, but differ in the design of the body and installation features. According to this criterion, kitchen hoods are usually divided into several types.
Hanging or flat hoods mostly fall into the budget category. They are either mounted on the wall above the stove or attached to the bottom of a wall cabinet. The engines of the devices are not very powerful, so for large premises they don't fit.
Built-in kitchen hoods resemble flat hoods in design, but are installed inside hanging cabinets. IN Lately models have appeared for installation in the ceiling, wall and even kitchen countertop. Many of them have pretty good performance.
Dome (fireplace) models are attached to the wall or ceiling above the stove. This type of hood is an active design element, so the choice of their appearance has great importance. The devices are distinguished not only by a large range of sizes, but also by a wide range of colors and shapes. They are considered one of the most productive. Based on the installation method, dome hoods are divided into wall-mounted, ceiling-mounted and corner hoods.
Inclined hoods appeared on the market relatively recently, but have already won many fans. Internal organization The devices are absolutely standard, but in appearance they are strikingly different from all other models. Their working panel is not located parallel to the stove, but at an angle to it. Inclined hoods– a striking example of implementation modern technologies in the kitchen.
Island hoods are chosen by owners of large kitchens who decide to remove work surface on a kind of “island” in the middle of the room. Island models have an exclusive design and high power, but their price is quite high.
Operating modes
When purchasing a kitchen hood, its operating mode is of great importance. Its choice depends on the condition of the ventilation system of the room. Nowadays there is practically no strict division of hoods into flow-through and circulation - the devices can operate in both modes. So decide how you will exploit exhaust device, you can after purchasing it. If you can’t install an air duct, buy a carbon filter and the hood will purify the air rather than exhaust it. Many people use both modes, changing them depending on conditions and time of year.
Air exhaust
Hoods with outlets are traditionally considered the most effective. Indeed, just a few years ago recirculation models could hardly compete with them, but now a lot has changed.
A hood with a ventilation outlet should not clean kitchen air, and take it outside the premises. For this purpose, a pipe leading to the ventilation duct is connected to it at the installation stage. Pipes with corrugated or smooth surface. The first ones are easier to install, as they easily follow any curves of the walls, however, when air passes through them, additional noise is created. Smooth plastic air ducts (round and rectangular) are more difficult to install, but they look more attractive.
The presence of a grease filter in a hood with an outlet is mandatory - without it, the internal parts will quickly become covered with a layer of grease. But you don’t have to install coal - there is no point in thoroughly purifying the air, which will still be discharged to the street. Savings on replacing carbon cartridges – additional benefit branch models.
The possibility of installing an exhaust device with air removal largely depends on the condition ventilation duct. In most houses old building it is unsatisfactory. Ventilation is simply not designed for the installation of powerful hoods; the air ducts have a small cross-section and are often clogged with debris. In this case, even a device with high performance will not work effectively enough. It’s easier for residents of private houses - they can lead the air duct directly to the street by laying an individual channel for it. This practice is increasingly being used in city apartments.
The disadvantages of hoods with ventilation outlets are increased noise levels and cooling of the air in the room in winter time, as well as the complexity of installation due to the need to lay an air duct.
Recycling
A recirculation hood, unlike an exhaust hood, does not remove air from the room, but cleans it, then returning it back to the kitchen. In this device, the carbon filter is not only mandatory, but practically the main element. The degree of purification, and therefore the efficiency of the device, depends on its quality.
If a grease filter traps only suspended particles of fat, then a carbon filter catches everything else - impurities, odors, fumes. Naturally, all this does not disappear anywhere, but remains inside - the adsorbent absorbs the pollution ( Activated carbon). The carbon filter cannot be cleaned and used again - the element must be replaced. Its service life depends on the intensity of use of the hood, as well as on the manufacturer. On average it is 2-4 months, but some cartridges in premium devices can last up to a year.
The main advantage of a hood with recirculation is that there is no need to install an air duct. Simply mount the device on the wall, plug it into a power outlet, and it's ready to go. The noise level of such models is significantly lower than that of flow-through models.
Many people consider the fact that during operation of the hood the air in the kitchen is not replaced with fresh air, but simply cleaned, as a disadvantage. However, when installing a vent device, the air flow in the cold season, when it is impossible to open the window, enters the kitchen through slightly open doors from other rooms, and sometimes from the same ventilation if the hood is not equipped check valve. Such air can also hardly be called fresh, although there will be no smells in it. Therefore, the advantage of exhaust hoods, which consists in replacing polluted air with fresh air, should not be considered so obvious.
The main disadvantage of recirculating kitchen hoods are: additional expenses to replace carbon filters. Although, with the low cost of components and quite long term their operation, this disadvantage is also quite relative.
Kitchen hood power
Now let's talk a little about the power of a kitchen hood. We have already talked about what this is above. We will talk specifically about the amount of energy consumed, which is measured in kilowatts.
As already mentioned, the power of the hood motor does not always have a significant impact on the performance of the device. Based on this indicator, it is first of all worth assessing energy consumption: the lower the power, the less electricity the device will consume. It should also be taken into account that overly powerful motors produce quite a lot of noise.
Depending on the model, the power of exhaust devices can be from 25 to 600 W. Therefore, you can connect them to regular sockets. More powerful models are rarely connected directly to electrical wiring.
Calculation formula
Having learned about the design and operation features of kitchen hoods, you can proceed to calculating performance. Most often, a simplified formula is used for this purpose, which takes into account the area and height of the room where the device will be installed. True, some suggest calculating the required performance based on the total thermal power of the slab, the diameter of the air duct and the number of its bends, but such calculations can only be done by specialists.
The formula for calculating hood performance looks like this:
Q is the required productivity, S is the area of the room, h is its height. 12 is the coefficient of air renewal in the kitchen in one hour (according to SNiP standards).
But this formula assumes that the kitchen hood will always work at the limit of its capabilities. This is not advisable. Firstly, the noise level at maximum speed is too high, and secondly, the internal mechanisms wear out very quickly. Therefore, a performance reserve is required. Which? Now let's do the math.
The concentration of harmful impurities in the air directly depends on what type of stove you have in your kitchen. In accordance with this, the air exchange coefficient will need to be changed in the formula. If the stove is electric, instead of 12 we set it to 15; if it is gas, we increase the coefficient to 20.
Next, you need to take into account the operating mode of the hood. If the device is flow-through, its efficiency is greatly influenced by the condition of the ventilation shaft. If the channel is dirty, it is better to increase the productivity margin. Some experts recommend multiplying the result by two. That is (for an electric stove):
Q= (S x h x 15) x 2.
In recirculation mode, additional resistance to the passage of air flow is created by a carbon filter. Therefore, productivity needs to be increased again, this time by 30-40%.
Advantages of Elikor hoods
Despite a large assortment exhaust devices European manufacturers, more and more buyers prefer domestic Elikor hoods. The company has held a leading position in its segment for more than 20 years.
All produced models are manufactured taking into account the basic principles of ergonomics, and their functionality ensures the most comfortable work in the kitchen. One of the most important advantages of Elikor hoods is the presence of powerful motors, which are produced in Italian factories. Their use has not only significantly reduced energy consumption and noise levels, but also improved the performance of the devices.
Special brackets included with the devices make it easy to fix the case even on the wall along which the gas pipe. Reusable five-layer grease filters are easy to clean thanks to a special coating.
The range of Elikor hood models includes several design lines that differ external design and the materials used. To equip modern kitchen Exhaust devices of the Modern series are designed, having strict geometric shapes and a fairly laconic design. The emphasis is on the variety of functions and modes.
Elikor is a series of decorative hoods that create bright accents in the interior. Almost every model uses a combination of several materials.
Elikor Classic is a collection of hoods with a traditional design and familiar color shades. Country – models in light colors with wooden inserts.
Impressive and specifications Elikor hoods. Their productivity can reach 1000m3/hour. The devices operate in 3-7 speed modes, and the noise level does not exceed the norm. The control can be either mechanical or electronic (touch). LED bulbs provide high-quality lighting. And you get all this at a very affordable price.
Purchasing from a company online store means an official guarantee (60 months on models with an Italian turbine), fast delivery, convenient design orders, telephone consultations with managers.
The range of kitchen hoods for stoves is huge, there are models different forms and sizes. But appearance in this technique is not the main thing. More important technical specifications power and volumes of pumped air. Functionality is more important than aesthetics. Only a competent engineer can accurately calculate the performance of a kitchen hood. However, when selecting exhaust equipment for apartments and private houses, simplified formulas are often used. Let's consider how to use them correctly and adequately interpret the calculation results.
When cooking on a stove, fumes, soot, and pleasant and not so pleasant odors inevitably form. The kitchen room must be rid of all this immediately, otherwise you can forget about a comfortable microclimate and cleanliness in the kitchen. You will have to spend a lot of effort on washing the cooking surface and the walls around from grease deposits, and also constantly keep the windows open for ventilation.
A kitchen hood should be beautiful, efficient and larger than the hob area
For bakeries and food preparation shops, a hood is a must. In a cottage or apartment, its installation is left to the discretion of the owners. By building regulations residential buildings are equipped with natural or forced ventilation. However, even for small kitchen This air exchange system is often not enough.
Household kitchen hoods consist of:
- housings;
- electric motor;
- fan;
- air purifying filters;
- lighting elements.
They can operate in pull and recirculation mode. In the first case, room air is sucked out of the room, replaced by new air from ventilation system. And in the second, it is pumped through internal carbon filters and returned to the room already cleaned.
Important! Connecting a hood to existing ventilation ducts may disrupt its operation; not all air ducts are designed for increased load.
For purely exhaust equipment, it is necessary to arrange an outlet into the ventilation duct, which does not always look aesthetically pleasing. Plus, for her efficient work continuous influx required fresh air from outside. Equipment with recirculation is easier to install, but its carbon filters will have to be changed at least once a year.
Variety of hood designs for kitchen stoves
It is worth clearly understanding that, regardless of the model and power, the kitchen hood is designed to purify and remove polluted air exclusively from the surface of the stove. The space under the ceiling is inaccessible to it, which is why it is so important to select ventilation equipment according to the size of the hob.
The performance of the hood is calculated in cubic meters/hour - this is the volume of air that it is capable of pumping through itself. Power is measured in kilowatts, which reflects the amount of electricity consumed during operation. These two quantities should not be confused.
Standard requirements! The performance of the exhaust equipment should be such that it can refresh all the air in the kitchen of an apartment or private house at least ten times per hour.
According to SNiPs, during operation, ventilation equipment, which includes hoods, must completely renew the air in the room several times within an hour. For kitchens in residential buildings this value is defined as 10–15. It depends on the type of stove, fan operating mode and other factors. To simplify calculations, it is customary to take this coefficient as 12.
How to calculate the power of exhaust equipment
The power ratings of a hood directly depend on its performance. The more air it can pump, the more powerful the fan is, which requires an electric motor to operate.
For equipment connected to ventilation ducts and operating only in exhaust mode, performance should be calculated based on the cross-section of the air ducts. It is almost impossible to do this without engineering knowledge and a housing design. And the calculation of hood power by area is only suitable for recirculation models. Unlike the first option, the size of the ventilation ducts does not affect their performance.
The simplest formula for calculating area
Classic performance calculation kitchen hood- multiplying the square footage of the kitchen, its height and a factor of 12. However, the resulting figure is very arbitrary. It does not take into account many factors.
- cooking on an electric stove;
- kitchen room with closed doors and windows;
- rectangular kitchen without an abundance of decorative frills.
If a gas stove is used for cooking, then the coefficient of 12 should be changed to 20 without hesitation. In this case, in addition to fumes, the hood will also have to remove gas combustion products from the kitchen. Plus, in any case, it’s worth adding 15–20% in reserve.
Calculation of the performance of exhaust equipment based on the cubic capacity of the kitchen
Another 25–30% of power must be added to the carbon filter. It creates additional resistance to the passage of air flow.
Important nuance! Calculations of performance and power for the hood should be made based on the area of the kitchen itself and the rooms adjacent to it, if they are not fenced off from the first.
If the door to the kitchen is constantly open or there is an arch instead, then the parameters of the exhaust equipment should be calculated based on the general square footage of the adjacent room. The same applies to corridors, as well as combined living rooms or halls. The absence of obstacles increases the volume of processed air, as it constantly circulates between the kitchen and adjoining rooms.
Consideration of additional factors
The above performance calculation is based on exhaust hood with recirculation. If the equipment operates in exhaust mode, sending flow into ventilation, then its efficiency is greatly influenced by the throughput of the ventilation ducts. Of course, it is possible to increase the volume of air pumped through a narrow shaft by increasing engine power, but this leads to increased noise from the operating fan and overheating of the electric motor.
Approximate indicators of the required performance of a kitchen hood
In most private and apartment buildings The ventilation ducts in cross-section do not exceed 125 mm, which allows about 400 m 3 /h of air to be pumped through them. If you install a higher-capacity hood in the kitchen, it will be of little use. In addition, air ducts often have irregularities, narrowings and turns inside, which further reduces their capacity.
Important! The efficiency of a kitchen hood depends on the operating mode and method of its installation, as well as the cubic capacity of the room, the type of stove and the design features of the ventilation ducts.
If you follow a simplified calculation, then for a small kitchen area a low-power hood will be sufficient. However, formulas are formulas, and common sense never hurts. Smells from the stove fill a small room faster, and their concentration in this case is an order of magnitude higher than in a spacious kitchen. For absolutely small room where food is prepared, it is necessary to select equipment more powerful than the calculated indicators.
Choosing a kitchen hood: noise vs performance
As power increases, operating noise increases exhaust system. Excessive noise will quickly tire a housewife; as a result, cooked food may turn out to be unsuitable for consumption.
A modern hood for a home kitchen makes 40–45 decibels of noise when operating.
Household hoods are equipped asynchronous electric motors, which, unlike power units in vacuum cleaners or drills they are much quieter. However, when they are turned on full power the noise becomes noticeable. Only at low and medium speeds they do not create unpleasant sensations.
Advice! The optimal hood is a model with adjustable power and several operating modes.
Completely silent kitchen appliances does not exist. Manufacturers are doing everything possible to reduce its noise, but they are far from omnipotent. In this case, the noise intensity depends not only on the power of the electric motor and fan, but also on the cleanliness of filters and air ducts. Without regular maintenance, the hood will only provide comfort instead of headache.
Video: how to choose a hood with optimal design and power
A kitchen hood is part of a forced ventilation system, so the calculation of its power and performance should be carried out together with the design of all ventilation. The above formulas will allow you to navigate the calculated and necessary figures. This is sufficient for most home kitchens. If you want maximum efficiency and stability in work, then it is better to turn to professionals for accurate calculations.
Correctly calculated performance and hood power make a big difference more problems than we think. Unpleasant burning odors, inevitable fumes from heating appliances, hateful deposits on the walls and ceiling of the kitchen and much more can be solved with the help of a hood. Add to this clean air (which is important for allergy sufferers, for example), saving money from frequent cosmetic repairs premises and furniture (from humidity) and time for general cleaning(from plaque). Having combined all the components, you understand how important it is to choose the right hood that is right for you.
What you need to know first when choosing a hood:
- method of connecting the hood: It is important to know whether you have the opportunity to connect the hood to an external ventilation duct for air purification. If there is such a possibility, great, polluted air will be easily removed outside the room. If this is not possible, it doesn’t matter, the air will be cleaned by special filters that are built into the hood.
Advice from Osmin: - There is a misconception that a kitchen hood must provide complete ventilation in all conditions. This is not entirely true. The efficiency of a kitchen hood directly depends on the type of installation and organization of air flow. Remember! A kitchen hood is an integral part of the ventilation system, but does not replace it completely.
- hood dimensions: When choosing a hood for the kitchen, you need to take into account the ratio of the hob and the kitchen hood. Remember the basic rule: buy a hood with dimensions no smaller than the hob. Then the leakage of polluted air is minimal. If these parameters are neglected, the efficiency of removing vapors and combustion products may decrease.
- type and size of room(isolated kitchen, kitchen-studio, kitchen-living room, ceiling height, indoor ventilation system, etc.): knowing these parameters, you can calculate the performance (power) and noise level of the hood, thereby providing for yourself and your loved ones clean air in the kitchen.
Advice from Osmin: - There is an opinion that in a small kitchen, say 6-9 sq.m., the most primitive hood is enough. However, in a small room, odors spread faster and the concentration of combustion products is higher, because the amount of emissions does not depend on the size of the room.
How to correctly calculate the performance and power of the hood:
There is still complete confusion when calculating the performance of kitchen hoods. Starting from the fact that different manufacturers indicate the parameters of their devices obtained different ways. Some people declare the “bare” performance of a turbine, others write real measurements of a specific model. Serious companies in their catalogs indicate all possible parameters for all types of tests ( Additional information can be requested from the managers at the Osmin store), and the main parameter is with free air flow for each model.
The classic formula for calculating power:
Where P is the required minimum exhaust capacity (m3/hour); V – kitchen area; H – ceiling height; 12 – optimal air exchange per hour.
Firstly, number 12, the SES standard for air renewal in kitchen premises (12 times per hour), which will allow you to obtain the necessary performance for your room at the maximum (!) speed of the hood, which means that you have no power reserve for emergency situations. In addition, the hood at this power will operate in the noisiest mode.
Secondly, if the hood is attached to the air vent, then a power reserve factor of 1.3 should be added, and if it cleans with carbon filters, then 1.5-1.7. Filters that capture grease and odors have a high resistance to air flow, so the power reserve factor is higher.
Third, the calculation coefficient may still vary depending on the type of hob. So, for electric hobs you need a coefficient of 1.5, and for gas ones 2.0 (since in this case, in addition to fumes from cooking, combustion products of the gas itself are also present).
Thus, for a kitchen 3x4 meters and a ceiling height of 2.7 meters with electric hob a hood with a minimum capacity of 486 cubic meters per hour is required, and with a gas hood - 648 cubic meters per hour. For comfortable use in medium modes and to have a performance reserve, we recommend 600 and 800 cubic meters per hour, respectively.
Fourth, as the calculated area it is worth using the boundaries of an isolated room, that is, limited by walls, doors and windows. If the kitchen does not have a closing door or it is not in use, then to calculate the area it is also necessary to take into account the area of the adjacent room that is not separated from the kitchen. In cases where the kitchen is combined with a living room or dining room, productivity requirements increase sharply due to the very rapid spread of odors and fumes into adjacent rooms, because they automatically become kitchen premises.
So, let’s summarize how to correctly calculate the power of the hood:
Given: kitchen 3*4 meters, with ceiling height 2.7; family of three; electric hob, on which they cook three times a day. There is an air vent.
Task: find a hood that suits the power
Solution:(3*4)*2.7*12*1.5 = 583.2 cubic meters/hour
On average, the performance of the hood you choose should be at least 600 cubic meters per hour, which is how much it can move cubic meters of air per hour in your room. Congratulations! This is the performance of an average hood in the most common price category. The choice here is huge in shape, color, and price.
What you need to know additionally about hoods:
Please also pay attention to additional functions modern hoods for the kitchen: which light bulbs will illuminate your work surface above the stove; is there a residual fan stroke that allows you to completely clean the air after cooking is completed; Is there an interval switching on of the hood, it is sometimes called “24 hour mode” so that the flow of fresh air into the room does not stop and keeps the air in your kitchen clean. Timer, air ionization, online recipes, designer lighting, operation from a remote control or launch from a mobile device - more and more technologically advanced models appear every year.
Room design and kitchen furniture: It has great value when choosing a kitchen hood. Pay attention to the design of the hood, the method and place of its attachment, the materials used, the color design, what kind of hob you have and what type and size of oven you have chosen.
Your habits and lifestyle: when choosing a hood, consider whether you have a large family, how often and how much you cook, the presence of allergies, animals, children, smokers indoors, etc. Because all this information will help you choose the device specifically for your family and for your home.
Now you can choose your own kitchen hood from the Osmin range. If you have any questions, call or ask us online. We will definitely help you buy the kitchen hood that you need.
The kitchen is a special place in the apartment. Not only does the hostess spend a lot of time here, 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 smoke, which also begins to penetrate into other rooms, there is no time for comfort here!
This helps to avoid such trouble useful device like a hood. 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 will need it to perform accurate calculations.
The uniqueness of the kitchen hood
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, what happens to the dirty air that gets into the hood body.
There are currently 2 operating options for the devices.
Inlet 
Reference. These are powerful devices that can quickly and efficiently remove dirt.
They remove dirty air from the kitchen. Most often he goes to supply ventilation, which is available in the apartment.
Air movement occurs inside a special channel - an air duct. It combines the housing with the ventilation duct.
Exists 2 types of air ducts
- First option - flexible, corrugated channel. It is usually used if an air duct with turns and corners is installed.
- 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.
Recirculating 
These are hoods that do not have access to ventilation.
This feature of the devices is related to the principle of their operation. Aggregates not deleted polluted air, and clean it and then return it to the kitchen again.
The lack 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.
Requirements for installing a hood 
For high-quality execution its functions units must be installed correctly.
The place for them is related to the location of the cooking device: electric or gas stove (panel). The hood is installed directly above them.
Important: The width of the hood cannot 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 cabinet (built-in).
An important factor when choosing a location is the convenience of connecting the structure to electricity.
This information will help you decide which unit is best for your kitchen.
Power is an important parameter for choosing a device
Having decided on the type, design, operating features and mounting of the unit, you need to remember about its power.
What is hood power 
In physics lessons at school, we were taught that the concept of power indicates the speed of conversion, the performance of the main function of the device.
What does this mean in relation to a hood? Since the purpose of this household appliances associated with air purification, we will be able to determine what its power is. Therefore, the unit of measurement for this indicator became m³/h.
Power is also called device performance.
This indicator should not be confused with energy consumption data, which is also in some cases called power. 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, buyers can choose household devices, having different power.
- Low-power units are produced with productivity from 25 cubic meters/h. This group includes equipment with the characteristics up to 150-200 cubic meters/hour.
- Average power expressed by indicators from 200 to 450 cubic meters/h. Most devices have a capacity of 300 to 400 cubic meters per hour.
- Powerful devices- these are hoods that process from 500 to 750 cubic m/h.
The productivity of industrial equipment is even higher. It reaches up to 900 cubic meters per hour.
Reference. Modern devices provide the ability to regulate 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! Small area kitchen is not a reason to purchase equipment with minimal power.
But this only complicates the task! How from large quantity devices to choose the most suitable?
The answer is simple: for each specific kitchen you will have to calculate optimal power hoods. And then all that remains is to purchase the device using the calculated data.
Sanitary standards
The calculation can only be correct if all the necessary data is used.
These primarily include sanitary standards. They are established by law.
Reference. According to requirements sanitary rules and norms in kitchens residential buildings The air should be completely renewed 12 times in 1 hour.
Let's remember this number. We will need it for calculations.
An air turnover coefficient of 12 applies to all residential premises, regardless of their size and location (apartment building or individual building).
Formula
Let's move on to further calculations. They must be accurate, so mathematics is indispensable.
Calculations are carried out using the following formula: S x H x 12 = P.
To calculate 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-made data can also be found in the technical passport of the apartment.
This determines the overall power of the device. However, this indicator is not final.
3 ways to count
There are different ways to find out what the performance of a structure working in your kitchen should be. Let's present 3 main methods that consumers are recommended to use.
According to the table 
Since we find out using this formula maximum performance hoods, which means you will always have to use them to the maximum. How will this affect the device? It can be assumed that such functioning is not in the best possible way will affect its longevity.
This means you need to buy a model more powerful than the data obtained. Therefore, a certain safety margin is included in the calculations, expressed as a factor of 1.3.
Getting the result
For simplicity you can use ready-made tables, which are compiled using an average magnification factor of 1.3.
This is the easiest way. In the left vertical column we find the required area, in the upper horizontal - the height of the room. At the intersection of the horizontal and vertical lines we find our data. The safety margin 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 hood power 
And in order to match the hood with a specific kitchen as accurately as possible, you need to include additional information in the calculations.
Odds for different panels:
- gas – 2.0;
- electric – 1.5.
- models with an air duct – 1.3.
- models with 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 use 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 factor of 1.3.
Calculation examples
As an 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 cc m/h.
10 sq. m
- Ceiling – 2.7 m.
- Electrical 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 cubic meters/hour
12 sq. m
- Ceiling – 3 m
- Electrical panel (1.5) with filter (1.7) – coefficient 1.7.
12 x 3 x 12x 1.7 = 734 cubic meters/hour
15 sq.m
- Ceiling – 2.7
- Electrical panel (1.5) with air duct (1.3) – coefficient 1.5.
15 x 2.7 x 12 x 1.5 = 729 cubic meters/hour
Third way 
Experts offer another easy way, which is the most common.
It is associated with an increase in the air turnover ratio.
According to this technique, instead of multiplying by 12, another coefficient is used.
- 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 cc m/h.
10 sq. m
- Ceiling – 2.7 m.
- Electrical panel.
10 sq. m x 2.7 m x 15 = 405 cubic meters/hour
12 sq. m
- Ceiling – 3 m.
- Electrical panel.
12 x 3 x 15 = 540 cubic meters/hour
15 sq.m
- Ceiling – 2.7 m.
- Electrical panel
15 x 2.7 x 15 = 607 cubic meters/hour
As you can see, this simplified calculation gives slightly different figures.
They can be used as a guide 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 will be able to purchase a unit that will not only fit perfectly into the interior, but also cope with its purpose. Thanks to correct selection appliances, you will be able to always keep fresh air in the kitchen.
Let's start, perhaps, with natural and. As the name implies, the first type includes ventilation and everything that has nothing to do with devices. Accordingly, to mechanical ventilation include fans, hoods, supply valves and other equipment for creating forced air flow.
Good for the moderate speed of this flow, which creates comfortable conditions indoors for a person – the wind is not felt. Although correctly installed high-quality forced ventilation also does not bring drafts. But there is also a minus: at low air flow speed at natural ventilation a wider cross-section is needed to feed it. As a rule, the most effective ventilation is provided with complete open windows or doors, which speeds up the air exchange process, but can negatively affect the health of residents, especially in winter period of the year. If we ventilate the house by partially opening the windows or completely opening the vents, such ventilation requires about 30–75 minutes, and here the window frame may freeze, which may well lead to condensation, and the cold air entering long time, leads to health problems. Widely open windows speed up air exchange in the room; through ventilation will take approximately 4–10 minutes, which is safe for window frames, but with such ventilation almost all the heat in the house comes out, and for a long time indoor temperatures are quite low, which again increases the risk of disease.
We should also not forget about the increasingly popular supply valves, which are installed not only on windows, but also on walls inside rooms (wall supply valve), if the window design does not provide for such valves. The wall valve provides air infiltration and is an oblong pipe installed through the wall, closed on both sides with grilles and adjustable from the inside. It can be either completely open or completely closed. For convenience in the interior, it is recommended to place such a valve next to the window, since it can be hidden under tulle, and the flow of passing air will be heated by radiators located under the window sills.
For normal air circulation throughout the apartment, it is necessary to ensure its free movement. To do this on interior doors install transfer grilles so that the air moves smoothly from supply systems to the exhaust, passing throughout the house, through all the rooms. It is important to consider that the correct flow is considered to be the one in which the smelliest room (toilet, bathroom, kitchen) is the last. If it is not possible to install a flow grille, it is enough to simply leave a gap between the door and the floor, about 2 cm. This is enough for air to move easily around the house.
In cases where natural ventilation is not enough or there is no desire to provide it, they switch to using mechanical ventilation.