A kitchen hood is an important element that draws air and removes dirt, grease, and unpleasant odors from it. For effective cleaning of air masses, it is necessary to calculate the dimensions of the kitchen hood in advance. It is necessary to make the correct calculation taking into account the norms of SNiP, SanPiN, plate dimensions and other important criteria.
Exhaust requirements
The hood is a device that cleans the air from impurities formed during the cooking process. The main parameter for choosing a device is performance, which is directly related to power.
There are SNiP norms, which spell out the criteria for different types of kitchens. For a kitchen with an electric stove with two burners, an extractor hood with a capacity of 60 cubic meters / hour is selected. For three and four burners, these values will be 75 cubic meters / hour and 90 cubic meters / hour. A gas stove will require 100 cubic meters / hour.
To carry out independent calculations, there is a formula according to which the minimum exhaust capacity is found: P = 12 × S × Hwhere R - power (performance), S - kitchen area, H - the height of the kitchen. Coefficient 12 sets SES.
The dimensions of the kitchen unit are not directly proportional to the performance. Different models may have the same power, but differ in size, so you should look at the passport data.
Types of hoods by mounting method
The size of the cooker hood directly depends on the fixing method. There are several varieties:
- Suspended. The device is mounted above the stove. It contains filters that need to be changed periodically. The dimensions can be compact, so such a device can be placed even in a small kitchen.
- Embedded. The device must be built into a cabinet or other box, which is bought in a store or made independently. It can have a pull-out panel that increases the functional area during the operation of the hood. There are design advantages to integrating the device into a cabinet.
- Dome. They have high power and are connected to central ventilation. They come in different shapes. The height of the dome can be up to 125 cm.
- Corner. Suitable for installation in non-standard kitchens, where, due to design features, it is impossible to use other models.
The suitable type can be selected depending on the individual characteristics of the room. The hood can be connected to a ventilation system to extract air, therefore, the need to install pipes must be taken into account.
Exhaust width
The most important parameter when calculating the dimensions is the width. According to the requirements, it must correspond to the dimensions of the hob or be slightly larger in order to effectively clean all air masses. You cannot take less, otherwise some of the secretions will pass by the hood and settle on the ceiling.
On sale you can find hoods of different widths. The most common width is 60 cm.The model range is also provided with products with the following standard sizes: 30 cm, 45 cm, 50 cm, 80 cm, 90 cm, 100 cm and 120 cm.The last two types are sold infrequently, since they are practically not used on ordinary apartment kitchens. Their main area of application is restaurants and cafes with professional cookers, for which the hoods are made to order.
Depth and height selection
In the case of choosing a built-in device, the size criterion depends on the dimensions of the cabinet in which the hood will be installed. Most recirculation models have a pull-out panel that increases their depth and increases efficiency.
Dome-type products can have a height of 125 cm. This must be taken into account when buying and planning the placement in advance so that the device fits.
The minimum distance between the hob and the hood must be taken into account. For gas stoves, it is at least 65 cm, for electric ones at least 60 cm. If an inclined hood is used, the distance will be slightly less - 55-65 cm for a gas stove and 35-45 cm for an electric one.
You should not reduce the height. This can lead to a hazardous situation or the hood failure. If the value is increased, the performance may deteriorate, therefore, the above standards should be adhered to.
Duct application
The size and location of the hood is influenced by the need to connect to the duct. The best option is to place the device under the ventilation hole. This allows you to minimize the route of the air duct and increase the efficiency of air purification from contamination.
Such an installation is not possible in every kitchen. Then special pipes are used. In this case, it is also required to calculate their correct location so that the pipeline runs at right angles and has a small number of bends.
Suitable for work are pipes made of aluminum or corrugated plastic. The diameter for the kitchen hood is 80, 100 and 129 mm. The section can be square or round. Various connectors are used for connection. The dimensions of the cross-section of the air duct and the outlet must be the same so that the contact is safe and reliable, and the removal of polluted air is stable.
Pipes can be installed in a hidden or open way. In the second case, repair and maintenance is facilitated, but fixation will be required approximately every meter. Brackets and clamps are used for connection. Also, a valve is installed in the shaft, which prevents the penetration of foreign odors back into the room.
