Fans with non-return valve: characteristics and subtleties of choice

Fresh air in the apartment is not a whim, but a point necessary for health and a good microclimate. Installation of ventilation should be carried out at the stage of repair and carefully designed (especially for private houses), otherwise there are great risks of exposure to high humidity in the room, stale air and even mold. An important point is the placement in the bathroom exhaust fan, which normalizes the parameters of the air in this difficult room.

Fans with non-return valve are often installed in bathrooms and toilet rooms instead of a natural ventilation system.This device allows you to cope with the formation of condensate and steam during the adoption of water procedures. This problem is particularly acute for those who have natural ventilation is not working properly, as well as those who use the shower and bath more than once a day. The lack of exhaust will provoke dampness, and subsequently the growth of mold and mildew, which can cause serious damage to the health of residents.

The exhaust fans with a check valve have their advantages, among them:

• possibility of installation in bathrooms of all sizes;
• good compatibility with classic air ducts installed from the developer;
• possibility of installation not only on the wall, but also on the ceiling;

• strength, thanks to a special ABS plastic;
• does not pass unpleasant smells from neighbors;
• low noise level; there are absolutely silent models;
• high moisture resistance and fire safety;
• good equipment (for example, a humidity sensor, movement, protection against short circuits, etc.);
• motor voltage is 12 volts.

But these fans have disadvantages:

1. High cost of equipment. Not everyone can afford to install a fan with a check valve, and even from a well-known manufacturer without significant costs.However, the life of these devices is quite large and its cost will pay off due to the absence of problems in the bathroom related to humidity.
2. Not all models can provide sufficient pressure, so when buying a fan should pay special attention to this item.

Modern 100 mm fans are very quiet. This is achieved thanks to the design features. The engine is connected to the housing by means of specialized vibration damping rubber bushings. Due to this, the lack of resonance is achieved, and the noise is reduced. The bearings in the engine are treated with a special lubricant that does not need to be changed during the entire service life of the fan, and the accuracy of the performance of adjacent parts ensures that there is no noise from the movement of the shaft. The case of modern products is made of ABS plastic, which is highly durable. In addition, the device is configured for a certain vibration load, the parts do not become loose for at least 3-4 years.

For well-equipped houses with a large number of residents, the presence of a check valve in the fan is important.It does not allow air to move inside the room when the fan is off. The valve effectively protects against dust, debris and odors. This is especially true when smoking in his apartment neighbors. With such a fan, tobacco smoke will not penetrate. The valve operates according to the following principle:

• when you turn on the device, the sash opens;
• when the device is turned off, the sash returns to its original, closed position.

Fans with non-return valve divided by type of operation into several types.

1. Managed by The valve in this type of fan is driven manually or by means of an electric drive.
2. Self-closing This is the main type of fan, the most common of those used for domestic purposes. The valve is driven by a special spring, which is triggered after the stopper blades.
3. Passive. This type of device changes the position of the valve depending on the forward or reverse stroke. The principle of operation is based on earth gravity. Often used for kitchens and bathrooms.
4. Petal (inertial lattice). They are used exclusively in manufacturing.Have a type of gate which are established in a steel air duct.

An electric actuator on the valve is a good option for automating the process of ventilating a large building, room, or warehouse. This allows offline regulation of humidity inside.

The fan section with a check valve can be both round and rectangular. The most popular is the butterfly valve shape valve. Because of these petals, the air can only move in one direction. If the flow starts moving in the other direction, then the valve immediately closes.

And also there are silent fans. They are ideal for country houses and apartments, as they do not create discomfort during their work. Professionals recommend installing such models in apartment buildings, where ventilation is one for several apartments.

In order to choose the right ventilator for the bathroom from the whole variety presented on the modern construction market, several aspects should be considered and paid attention to. You can elaborate on this.

Fan performance depends on its power. In order not to be mistaken with the power, you should know the volume of the room, as well as a constant indicator of air exchange. This parameter shows how many times in 1 hour the air in the room should change. It is determined on the basis of sanitary and hygienic standards and should be in the range of 6-8 for bathrooms. If the apartment is home to 2 people, then the rate of air exchange can be reduced to 6, and if more than 3 people, then choose an indicator in the range of 7-8. To calculate the performance indicator, the volume of the room is multiplied by the selected rate of air exchange.

Economy is also an important aspect when choosing a device. In order to have control over the electricity consumed by the fan, manufacturers equip some of their models with additional functions. They allow significant savings by maximizing the automation of the device. For these purposes, the devices have humidity sensors, movement and timers.

The humidity sensor starts the fan at the moment when the air indicators in the room differ from the set (predetermined) parameters.The motion sensor reacts to the person and therefore turns on only when someone is in the bathroom or the toilet, and turns off when there is no movement. But this sensor may not work properly, for example, with insufficiently intensive movements or unauthorizedly disable ventilation.

A short period of work may not be sufficient to fully replace the air in the room. From this point of view, the timer is the best solution. It turns on the fan at a certain, programmed time and turns off the device after the required number of minutes. The operating time of such a fan is chosen strictly individually based on the size of the bathroom, as well as the intensity of its use.

The choice affects the comfort of operation. The fan noise level should be acceptable. Even modern silent models make a small sound, but it does not cause pronounced irritation.

Installation of a fan with a check valve in the bathroom is usually carried out in the ventilation hole of the stationary system. It should be carefully checked, because if the mine is clogged with debris, the device will not work correctly. Also, do not greatly reduce the size of the ventilation hole - it can adversely affect the efficiency of air exchange in the room.

To install a fan with a check valve in series, you need to perform several difficult, in general, operations.

1. Prepare the vent hole. If the device has a large cross section, then the hole in the wall is expanded with a perforator. If it is too large, you can use the construction foam.
2. Wiring and connection to the mains. All cables and wires must be either plastered or hidden in the cable channels. The design and scope of work directly depend on the type of fan selected, as well as on the availability of additional options. For example, when connecting a device with a manual switch, for ease of use, install 2 switches, one on the light, the other - directly on the fan.
3. Installation in a wall or ceiling and fasteners. The vent hole must be closed with a special invoice mesh.

Bathroom - one of the most problematic places in the apartment or in a private house. A high rate of humidity can adversely affect the overall microclimate in the home and cause the appearance of mold that is dangerous to the health of the inhabitants. Modern check valve fans are able to completely solve this problem. They are easy to install yourself, and the service life of some models is 10 years.

How to install a fan with a check valve in the bathroom, see the following video.