The kitchen is a special place in the apartment. Here, not only a lot of time the hostess spends, preparing tasty 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 children, which also begins to penetrate into other rooms, then there is no longer comfort!
To avoid such a nuisance, a useful device such as a range hood helps. However, this only happens if its power is selected correctly.
Let’s figure out how to calculate it yourself.
But first of all, we will clarify the basic information about the exhaust devices. We will need it to perform accurate calculations.
The peculiarity of the exhaust hood for the kitchen
The function of the hoods is air purification, removal of dust particles, burns, children.
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 dirty air that has fallen into the hood.
Currently, 2 options for the operation of devices are used.
Supply
reference. These are powerful devices that can quickly and efficiently remove contaminants.
They remove dirty air from the kitchen. Most often, he goes to the supply ventilation, which is available in the apartment.
The movement of air occurs inside a special channel - the duct. It integrates the housing with the ventilation duct.
Exists 2 types of ducts
- First option - flexible, corrugated channel. It is usually used if a duct with bends and corners is mounted.
- Another variant - use of hard plastic. Such a duct is mounted 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 associated with the principle of their work. Aggregates they don’t remove the dirty air, but clean it and after that they 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 the recirculation hoods is usually somewhat less than that of the air inlets.
Hood installation requirements
For the quality performance of their functions units must be installed correctly.
The place for them is connected with the location of the cooking device: an 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 stoves and hoods in different places of the kitchen.
Regardless of the principle of operation and power, exhaust devices can be mounted on the wall (flat, domed), on the ceiling (island), in the cabinet (built-in).
An important factor in choosing a place is the convenience of connecting the structure to electricity.
This information will help you decide which device is best for your kitchen.
Power is an important parameter for choosing a device.
Having decided on the type, design, features of the work and mounting of the unit, you must not forget about its power.
What is hood power
In physics classes at school, we were taught that the concept of power indicates the speed of conversion, the fulfillment of the main function of the device.
What does this mean with respect to the hood? Since the purpose of this household appliance is related to air purification, we can determine what its power is. Therefore, the unit of measurement of this indicator has become m³ / h.
Power is also called device performance.
Do not confuse this indicator with energy consumption data, which is also called power in some cases. The fact that these are different characteristics can be verified by comparing the units of measure. Electricity consumption is measured in kWh.
What power do modern hoods have?
Depending on specific needs, customers can choose household appliances with different capacities.
- Low power units are produced by productivity from 25 m3 / h. This group includes equipment with characteristics up to 150-200 m3 / h.
- Average power expressed by indicators 200 to 450 m3 / h. Most devices have a capacity of 300 to 400 cubic meters / h.
- Powerful devices are hoods that process from 500 to 750 m3 / h.
Industrial performance 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 clarified what is included in the concept of power. And we also found out that we have great opportunities for choosing an exhaust device of suitable performance.
Important! The small area of the kitchen is not a reason for acquiring the minimum power equipment.
But this only complicates the task! How to choose the most suitable one 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 be correct only when using all the necessary data..
These, first of all, 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 renewed 12 times in 1 hour.
Remember this figure. We will need it for calculations.
The air turnover ratio of 12 is applied to all residential premises, regardless of their area and location (apartment building or individual building).
Formula
We proceed to further calculations. They must be accurate, so you can’t do without mathematics here.
The calculations are carried out according to 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. 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. Finished data can also be taken in the technical passport of the apartment.
Thus, the overall power indicator of the device is determined. However, this indicator is not final.
3 ways to count
There are many ways to find out what the performance of a design that works in your kitchen should be. Imagine 3 main ways that consumers are encouraged to use.
According to the table
Since we find out using this formula maximum performance hoods, which means they will always have to be used to the maximum. How will this affect the device? It can be assumed that such functioning will not affect its long-term durability.
So, you need to buy a model more powerful than the received data. Therefore, in the calculations lay a certain margin of safety, expressed in a coefficient of 1.3.
Getting the result
For simplicity you can use ready-made tableswhich are compiled using an average magnification factor of 1.3.
This is the easiest way. In the left vertical column we find the desired area, in the upper horizontal column - the height of the room. At the intersection of the horizontal and vertical lines we find our data. Safety margin is already taken into account in them.
Based on 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 combine the exhaust device with a specific kitchen as accurately as possible, you need to add additional information to the calculations.
Odds for different panels:
- gas - 2.0;
- electrical - 1.5.
- air duct models - 1.3.
- models with a filter - 1.7.
The largest coefficient is entered into the formula.
So, if a gas surface (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 capacity should be increased with an additional factor of 1.3.
Calculation Examples
Let us, for example, 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. mx 2.5 mx 12 x 2.0 = 540 cc m / h.
10 sq. m
- Ceiling - 2.7 m.
- Electric panel (1.5) with air duct (1.3) - increasing factor 1.5.
10 sq. mx 2.7 mx 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 12x 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 m3 / h.
Third way
Specialists offer another a simple way, which is the most common.
It is associated with an increase in air turnover ratio.
In accordance with this technique, instead of multiplying by 12, another coefficient is applied.
- Electric cookers - 15.
- Gas surfaces - 20.
Calculation Examples
Let's see what the results will be in our examples.
9 sq. m
Initial data
- Ceiling - 2.5 m.
- The panel is gas.
9 sq. mx 2.5 mx 20 = 450 cc m / h.
10 sq. m
- Ceiling - 2.7 m.
- The panel is electric.
10 sq. mx 2.7 mx 15 = 405 m3 / h
12 sq. m
- Ceiling - 3 m.
- The panel is electric.
12 x 3 x 15 = 540 m3 / h.
15 sq.m
- Ceiling - 2.7 m.
- Electric panel
15 x 2.7 x 15 = 607 m3 / h.
As you can see, this simplified calculation gives slightly different numbers.
They can be used for orientation as a minimum indicator of the power that a kitchen hood should have.
Which method to apply in order to calculate the power before buying is up to you.
We hope that the question of which hood to choose will now not be too complicated. You can purchase a unit that not only fits perfectly into the interior, but also copes with its purpose. Thanks to the right selection of equipment, you will always be able to keep fresh air in the kitchen.
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