The main task of room ventilation is to remove smoke, unpleasant odors, steam outside and replace the air. Previously, natural air circulation was widely used, but modern apartment renovations do not allow this option to function effectively. A kitchen exhaust fan with a non-return valve solves this problem. Without forced aeration, mold will begin to appear in the corners, and the walls will constantly be soot from cooking.
Content
- Check valve working principle
- Fan selection
- Cooker hood
Check valve working principle
Distinguish between exhaust, duct and supply fans, the design of which is provided with a check valve. They are used to gradually replace air. The advantage of an exhaust fan with a valve in comparison with an air conditioner is that the former creates a stream of fresh air, and does not work with the existing one.
Such hoods are often used not only by residents of apartment buildings, but also by private ones. They are used for:
- kitchens;
- laundries;
- bathrooms and toilets;
- sanitary compartments;
- office smoking rooms, etc.
The hood has a fairly simple design. Check valves are classified into three types:
- Spring loaded. It is also called self-closing.
- Operated (manually or electrically).
- Passive. Closing or opening of the lid takes place under the influence of the air flow.
The spring is usually placed in the kitchen or bathroom. The cover is constantly open while the engine is running. When the fan is switched off, the check valve cover is closed by a spring. It does not provide complete sealing, but protects against foreign odors well.
Hoods with controlled electric valves are provided when it is necessary to create an automated ventilation system. They are used in industrial premises: warehouses, in some workshops, in factories, as well as in salesrooms and large offices. This ventilation prevents mold, mildew and condensation from forming.
Passive ventilation is the least common. Sometimes it can be used for a conventional kitchen hood.
Check valves can be made with or without heating. With this function, ice formation can be prevented in winter. This is necessary if the device goes outside. The unheated hood is used only indoors.
Fan selection
Hoods for cellars, bathrooms and kitchens are produced in different modifications and sizes, as well as with different blade shapes. Some models have an inertial grille. It works like a blind. After the engine has stopped running, the grille is closed. There are also economical modelswith a built-in timer. With its help, you can set the periods of the device operation.
When buying a device, you should take into account the presence of a power regulator, as well as a manual shutdown of the fan. For rooms with high humidity (bath, shower, steam room, etc.) ) it is worth choosing models where the corresponding controller is provided. Also, when choosing, it is important to consider some factors:
- The volume of the room in which ventilation will be installed.
- Object type.
- Number of residents.
Sufficient power of the appliance will provide good ventilation and prevent mold and mildew from growing. This can significantly improve the quality of life.
Cooker hood
Food is prepared in the kitchen every day. During this, a large amount of grease, smoke and steam accumulates on the walls, curtains and rises to the ceiling. Natural ventilation is often out of order for a long time. To avoid the accumulation of soot on surfaces, you need to install an exhaust fan with a non-return valve.
The simplest installation option is to install it above the stove, and the output can be made directly into the ventilation shaft. If the apartment has old windows, then you can mount a fan in the window. For a private house, it is necessary to make a hole in the wall to remove the stale air.
Productivity (volume of pumped air per hour) is a very important parameter. To choose the right hood, you need to know the volume of the kitchen: multiply the height by the length and width. Sanitary standards stipulate that a certain number of complete air replacement cycles must take place in the room. An indicator from 8 to 12 applies to the kitchen. There is also a safety factor, that is, losses that can occur due to a malfunction of the ventilation. Typically 1.3 is used. To calculate the required performance, multiply the volume, multiplicity and this coefficient.
The second point that you should pay attention to when buying a hood is the noise level. It is created by a motor that rotates the fan blades.
Don't forget about power. The higher it is, the better the exhaust air leaves the room. The check valve will prevent him from returning to the kitchen. But a powerful hood costs much more than a middle class fan.
