Selection and installation of a ventilation grille with a check valve

Ventilation grille with non-return valve is a necessary and practical device. The device effectively solves the problem of reverse thrust and protects the room from foreign smell and dust.

The ventilation grille with non-return valve consists of a protective housing, a mounting flange, a front decorative panel and a flap. The valve is able to open due to the forced circulation of air masses moving under a certain pressure. The grille is connected to the duct by means of a flange, which is available in different sizes and is fully compatible with all types of ducts. For the manufacture of lattices with a check valve mainly used plasticthat is due to the operation of the device in conditions of high humidity, where the use of metal components is impractical.

The principle of the check valve is as follows: the exhausted air masses leave the room through the decorative cover and, under a certain pressure, pass through the valve, raising the flap. When the air flow pressure drops, the valve is closed and acts as a reliable barrier to street dust, insects and unpleasant odor. Models are often installed in kitchens and bathrooms adjacent to similar rooms of neighboring apartments.

Stable consumer demand and high popularity of lattices with non-return valve due to a number of undeniable advantages of these devicesditch

• The valve prevents overturning of thrust and prevents the penetration of air masses from neighboring rooms or from the street.
• The high noise-absorbing effect reliably protects the room from extraneous sounds coming from neighboring rooms and the street hum.
• The modern aesthetic appearance of decorative grilles allows you to place the device in the premises of any purpose without the risk of cluttering the interior.

• Simple installation and undemanding in constant care make grilles one of the most practical devices for this purpose.
• The devices are available in a wide range with a wide variety of sizes, colors and designs. This greatly facilitates the selection of the desired model and allows you to purchase grille for any interior.
• The low cost of products makes them more affordable and popular.

The disadvantages of devices include the risk of freezing of dampers in the winter and not very high performance of most models. However, the problem of freezing the device is easily solved by installing an integrated heater.

Ventilation grilles with a check valve are divided according to a number of signs, the main of which is the type of locking device.According to this criterion, the models are divided into single-leaf gravitational, louvre-lobed, membrane and bivalve spring.

Single-door gravity models have a simple design.consisting of a locking element of a round or rectangular shape, which is eccentrically located on the axis. The air flow coming from the room, puts pressure on the working sash, so it opens. The principle of operation of devices of this type is based on the use of gravity of the leaf for its closure, which makes the models simple and reliable, and also allows them to be used in systems with natural circulation of air masses. This is due to the slight resistance of the sash and the ability to quickly open it, even with little flow.

Gravity models are available in two versions. In the first case, the axis of fastening of the sash is slightly shifted relative to the center of the air duct, and in the second case there is a counterweight, which can be located both outside and inside the device. Due to the fact that the lowering of the sash is due to gravity, the installation of the device must be done in a strictly vertical or horizontal position. When installing, it is advisable to use a building level.Otherwise, the sash will not fully close and will not be able to provide reliable protection of the room against the entry of external air.

Membrane devices are the most common type of lattice and are models in which the role of a valve is performed by a membrane. Valves equipped with diaphragm valves react to even a slight increase in air pressure and open easily. With the probability of increasing the pressure of air jets in the system, membrane models are reinforced by stiffeners, on which the membrane partition will rely in case of excessive thrust. In the absence of additional reinforcement, a membrane deformation may occur, then the valve will begin to undercut the incoming air.

Petal models resemble the structure of blinds and are distinguished by a long service life, small size and excellent locking effect. The principle of operation of such devices is similar to the principle of operation of gravity grids and is based on its own gravity. Blinds are designed for installation in the external parts of ventilation systems, and their dimensions are compatible with the dimensions of external ducts.

Butterfly valves have double-leaf design. Foldable to quickly fold and additionally fixed by a spring. Such models are slightly more expensive than other devices, but can be installed in any position. Spring models are able to function only in ventilation with forced circulation of air currents, and are not installed in the network with natural pitch.

The next sign on which the models are classified is the material of manufacture. The most popular raw material for the production of lattices with a check valve is plastic. Devices made from this material are distinguished by low weight, high corrosion resistance, long service life and low cost. In addition to plastic, galvanized steel is used in the production of gratings.

Metal models are highly heat resistant and can be installed in hot shops of industrial plants.kitchens catering and on the outside of buildings. The disadvantages of galvanized products are high weight and susceptibility to corrosive processes.Therefore, metal devices are not as popular and in demand as products made from plastic.

Due to the simple construction and low weight of the grilles, their installation can be carried out independently. The grille must be installed on the wall surface, however, some models may be installed in the ventilation shaft. The first stage of installation should be to connect the device to the duct, which is performed using a connecting flange. It is recommended to replace the space between the duct and the wall. Next, you should wait for the mounting foam to freeze, and then remove its surplus using a clerical or construction knife.

The next step will be fixing the grid to the bearing surface, which is performed using self-tapping screws or dowels.. The choice of fastener depends on the weight of the model and the material used to make the walls of the building and the enclosure. After the grille is in place, you can proceed to the test launch of the device. Ventilation grates with non-return valve are an important part of exhaust ventilation.The devices reliably protect the space from external flows and contribute to the creation of a favorable microclimate inside the room.

How to install the ventilation grille, see the following video.