Features of exhaust fans with non-return valve

Each room needs forced ventilation for a comfortable stay inside of living people, especially with regard to the kitchen and bathroom. Many users do not know in what cases it is possible to install exhaust fans, and what power they should be. Manufacturers of such equipment sometimes offer an exhaust fan with a check valve in order to solve all the problems arising from the specific nuances of using these premises.

Installation reasons

Natural ventilation over time, she can no longer cope with the tasks assigned to her, because no one cleans the mines of old houses, they become clogged, their efficiency leaves much to be desired.If many users install an exhaust system for the kitchen, so that during cooking, odors do not spread throughout the apartment, then why not install a bathroom fan with a non-return valve? Indeed, in the bathroom and in the toilet, we often observe such negative nuances:

• unpleasant odors are leaking from the mine ventilation system;
• there is no normal traction - as a result, the air stagnates;
• no fresh air inflow due to the clogged ventilation shaft of the building;
• mold starts to appear in the corners - this is a clear reason for the increased humidity due to poor ventilation.

If after the adoption of water procedures in the bathroom remains tile condensate, and moist air is kept for a long time - this is a signal that the ventilation needs urgent improvement. To do this, you can install an ordinary exhaust fan, which will force the removal of humid air from the room, but it will not solve the problems with an unpleasant smell from the mine - only fans with a non-return valve will help here.

Remember! Mold and fungus are formed fairly quickly, but to remove them is a very big problem, requiring the investment of money and your efforts.

Handle all problem areas chemical components - this is only half the battle, until you install a domestic fan for high-quality exhaust of stagnant air, you cannot solve these problems. In addition, it is necessary to ensure a normal flow of fresh air for the toilet and bathroom, otherwise all efforts will be in vain. Therefore, it is not necessary to make the doors completely hermetic - the air must somehow flow into these rooms for better ventilation.

Device design

Exhaust fans are axial or centrifugal type, and also according to power they are divided into industrial or domestic. We are only interested in the domestic version with a check valve. When choosing it is necessary to pay attention to the following parameters:

• performance, m³/ h;
• power consumption, kW;
• noise level, dB.

Some models work constantly, others only when necessary. The second option is preferable in terms of energy savings, many home craftsmen connect such equipment to the switch - the light in the bathroom turns on, and the exhaust fan starts working at the same time.

The check valve of all similar devices for use at home make from plastic. The specific design of the valve reverse action is widely used in various exhaust systems for various rooms and extracts for kitchens. It is based on the principle of operation. butterfly wings: during the flight they straighten, and the rest of the time they are folded. Two equal halves reliably shut off the air supply to the inside of the room after the fan has finished using special springs - they are opened by a blown mass of air.

This design, along with clear advantages, has some disadvantages:

• engine energy is expended on opening the valve leaves; therefore, the fan efficiency decreases slightly;
• valve flaps do not have sufficient tightness.

But in everyday life, this design copes with all the responsibilities.

The principle of the check valve

Structurally, the check valve is made in the form of a blade (one or several) that blocks the access of the air flow from the ventilation shaft or from the street - in the technique it is called reverse load. These devices are very effective for cutting off unpleasant odors from a common well vent: if a neighbor often smokes in a bathroom or toilet, then you will not smell cigarettes.

The principle of operation is very simple: special restrictive protrusions provide the normal movement of the valves by 90 degrees, so they move in two directions - opening and closing. When the device operates, the air flow opens it, and at the end of the special springs return them to their original place.

Today exist three main types check valves:

• controlled type - by electric drive or manually;
• self-closing valve with spring return;
• passive type, which changes its position due to the direction of the movement of air masses.

In everyday life, the fan is most often used in a bathroom or for kitchens, as well as in a bathroom with a valve of the second option.

In addition, there is a method for their separation according to the following parameters:

• horizontal or vertical view, depending on the location of the fan;
• round or square type - on the configuration of the duct;
• in the form of blinds.

When buying fans with a non-return valve, one should remember that all electric drives create separate noises, so if you are very sensitive to different noise effects, then choose self-closing valves.

Silent models

The fan for the bathroom silent with a check valve is very popular because it is ideal for an apartment or a country cottage. Thanks to the use of modern technologies, these fans no longer create much noise, like their predecessors. Experts advise installing such options in high-rise buildings, where ventilation has ramifications into several apartments. The valve will not allow the emergence of reverse thrust, will become a truly reliable barrier, preventing the entry of foreign particles from the street.

The photo shows a radial fan with a check valve:

It should be noted that they are called noiseless, but some noise is still present during operation, although at a very low level, therefore we do not perceive it.. There are special devices in the design of the device that help reduce the sound impact.

1. Elements that absorb any vibration are used - it’s no secret that it is the main source of different noise.
2. Manufacturers have given the task to designers to develop a unique aerodynamic appearance of the product - each protrusion creates a large vibration during the passage of the air flow. The air intake grille has streamlined shape and made of a special material that helps reduce air resistance.
3. The noiseless operation of the engine depends on bearing quality - today such products are used that do not require lubrication and ensure reliable rotation of the shaft with virtually no sound.

The table below presents several samples of fans for the bathroom silent class: we have selected for you the budget, medium and luxury options.

Benefits

Domestic fans with the installation of a check valve have a number of advantages over their counterparts without this small addition.

1. Exquisite and modern design, which organically fits into almost any interior - manufacturers took care of this.
2. Noiseless and very high performance.
3. Very effective removal of unpleasant odors, stale air outside the premises.
4. Moistureproof materials housing and exterior parts.
5. The body is made of light-resistant plastic that does not respond to temperature changes.
6. Low energy consumption and very long operation.
7. Easy installation on walls or in the ceiling, easy maintenance.
8. The heat loss of an apartment or private housing construction decreases, the efficiency of ventilation or air conditioning increases.
9. Management can be manual - from a stationary switch or in automatic mode: using a humidity sensor, movement or light, as well as a pre-set timer.

If a similar device is installed with an output in general ventilation of the house it effectively isolates your premises from unpleasant odors that may leak from your neighbors. When installing the product with a direct exit outside the building, it will not allow cold air in the winter and wet air into the apartment, after a rain in a different climatic time. The check valve does not take up much space, but its miniature dimensions do not affect the work efficiency.

Installation security

It is very important to take into account all sorts of errors that are inevitable when installing the fan on your own, because the system efficiency depends on its quality. The main mistake that is often made by inexperienced home specialists: the place of installation of the product was determined incorrectly. Before you plan the location of the device, it is necessary to make calculations that take into account the height of the ceilings, the cubic volume of the room and other nuances. The device must be fixed in the middle of a short wall or directly in the corner, but not opposite the shower or bath, so that it effectively captures all corners, leaving no dead zones where dampness can form and fungus develop.

If you yourself can not calculate the installation site, then you need to consult with professionals, otherwise your measures to ensure ventilation will be ineffective.

When your neighbors have already installed exhaust fans, then in the general system, there may be backdraft due to pressure drops, as a result, you will get unpleasant odors in your apartment. When the hood is done directly outside the buildingand the length of the air duct is below the norm, then smells will flow to you and to the neighbors in the apartment.

When the fan is not working, there is a risk that dust, insects, chemicals from exhaust vehicles and other components will get outwhich can even cause allergies. Only a check valve can prevent the return of thrust into your apartment. Therefore, it is necessary to consult a specialist to find out what could be the negative consequences of such an installation design. The non-return valve reliably closes the channel, therefore, ventilation with the device turned off is impossible, and may temporarily break air circulation total internal space of the apartment.

The result of all of the above: it is necessary to carefully choose the products with non-return valves, while taking into account all the nuances of your apartment or your own home, the location so that the installation of the device does not violate the ventilation of the entire room. In order to prevent negative errors that may not appear immediately, but only after some time of using the device, it is better to contact the professionals and order the installation at a company engaged in the maintenance of ventilation systems.