Imagine that you want to install the ventilation system in the apartment. Calculations show that for heating the supply air during the cold season, the calorifer with a capacity of 4.5 kW will be required (it will heat air from -26 ° C to + 18 ° C with ventilation performance equal to 300 m³ / h). The supply of electricity to the apartment is made through the machine on 32a, so it is easy to calculate that the power of the carrier is about 65% of total powerallocated for the apartment. This means that such a ventilation system will not only significantly increase the amount of electricity bills, but also overloads the power grid. It is obvious that the calorifer of such power is not possible and its power will have to be reduced. But how to do this without reducing the level of comfort of the inhabitants of the apartment?

How to reduce electricity consumption?

Estimation with a recuperator.
It requires a network
Support and exhaust air ducts.

The first thing that usually comes to mind in such cases is the use of a ventilation system with a recuperator. However, such systems are well suited for large cottages, the apartments simply do not have enough space for them: besides the supply aircraft, it is necessary to bring the exhaust network to the recuperator, while having doubled the total length of the air ducts. Another disadvantage of recovery systems is that for the organization of the "dirty" premises, a noticeable part of the exhaust flow should be sent to the exhaust ducts of the bathroom and kitchen. And the unbalancement of the supply and exhaust streams leads to a significant reduction in the efficiency of recovery (it is impossible to abandon the air pad "dirty" premises, since in this case unpleasant odors will start walking around the apartment). In addition, the cost of the recovery ventilation system can easily exceed the two-time cost of the usual supply system. Is there any other, inexpensive, the solution of our problem? Yes, it is a supply VAV system.

System with variable air flow or Vav. (Variable Air VOLUME) The system allows you to adjust the air supply in each room independently of each other. With such a system, you can turn off the ventilation in any room in the same way as you used to turn off the light. Indeed, because we do not leave to burn the light where there is no one - it would be unreasonable spending electricity and money. Why let it vainly spend the energy of the ventilation system with a powerful calorifer? However, traditional ventilation systems are exactly what they work: they feed the heated air into all the rooms where people could be, regardless of whether they really are there. If we ruled the light just like traditional ventilation - He would not burn in the whole apartment, even at night! Despite obvious advantage VAV systems, in Russia, in contrast to Western Europe, they have not yet been widespread, partly because there is a complex automation to create them, which significantly increases the cost of the entire system. However, the rapid reduction of electronic components, which occurs lately, allowed to develop inexpensive ready solutions To build VAV systems. But before switching to the description of examples of systems with variable air flow, we will understand how they work.

The illustration shows the VAV system with a maximum capacity of 300 m³ / h, serving two zones: living room and bedroom. In the first drawing, the air supply is made in both zones: 200 m³ / h in the living room and 100 m³ / h in the bedroom. Suppose that in winter the power of the carrier is not enough to heat this flow of air to a comfortable temperature. If we used a conventional ventilation system, we would have to reduce overall performance, but then in both rooms it would be stuffy. However, we have a VAV system installed, so in the afternoon we can serve air only in the living room, and at night - only in the bedroom (as in the second drawing). For this, the valves that regulate the volume of air supplied to the room are equipped with electric drives that allow us to open and close the valve flaps using conventional switches. Thus, by clicking on the switch, the user before going to sleep turns off the ventilation in the living room, where there is no one at night. In this moment differential sensor Pressure that measures the air pressure supply installation, Fixes an increase in the measured parameter (when the valve is closed, the resistance of the aircondition network increases, leading to an increase in air pressure in the air duct). This information is transmitted to the supply unit, which automatically reduces the performance of the fan exactly so that the pressure at the measurement point remains unchanged. If the pressure in the air duct remains constant, then the air flow through the valve in the bedroom will not change, and will still be 100 m³ / h. The overall performance of the system will decrease and will also be equal to 100 m³ / h, that is, the energy consumed by the ventilation system decrease 3 times without prejudice to the comfort of people! If you include the air supply alternately: during the day in the living room, and at night to the bedroom, then the maximum power of the carrier will be reduced by a third, and the average energy consumed is twice. The most interesting thing is that the cost of such a VAV system exceeds the cost of a conventional ventilation system by only 10-15%, that is, this overpayment will be quickly compensated by reducing the amount of electricity bills.

It is better to understand the principle of operation of the VAV system will help a small video presentation:

Now, having understood with the principle of work of the VAV system, let's see how you can collect such a system based on the equipment market. As a basis, we will take Russian VAV-compatible Breezart supply units, which allow you to create VAV systems serving from 2 to 20 zones with centralized control from the console, by timer or CO 2 sensor.

VAV system with 2-position control

This VAV system is assembled on the base of the Breezart 550 LUX supply unit with a capacity of 550 m³ / h, which is enough to maintain an apartment or a small cottage (taking into account the fact that the system with variable air flow can have less performance compared to the traditional ventilation system). This model, like all other breezart junctions, can be used to create a VAV system. Additionally, we need a set VAV-DP., which includes a JL201DPR sensor, measuring pressure in the duct channel near the branch point.

VAV system for two zones with 2-position control

The ventilation system is divided into 2 zones, and zones may consist of both one room (zone 1) and from several (zone 2). This allows you to use similar 2 zone systems not only in apartments, but also in cottages or offices. The valve management of each zone is made independently from each other using conventional switches. Most often, this configuration is used to switch the night (air supply only to zone 1) and daytime (air supply only to zone 2) modes with the possibility of supplying air to all rooms, if, for example, guests came to you.

Compared by the usual system (without VAV control) an increase in the cost of basic equipment is about 15% , and if you consider the total value of all elements of the system together with assembly workThe increase in cost will be almost inconspicuous. But even such a simple VAV system allows save about 50% of electricity!

In the example above, we used only two controlled zones, but there may be any quantity: the supply unit simply supports the specified pressure in the air duct, regardless of the configuration of the airconduct and the number of managed VAV valves. This allows you to first install the simplest VAV system into two zones first, increasing their quantity in the future.

So far, we have considered systems with 2 positional regulation, in which the VAV valve is either opened by 100% or completely closed. However, in practice more often use more comfortable systems With proportional control, allowing to smoothly adjust the volume of the air supplied. An example of such systems we now consider.

VAV system with proportional control

VAV system for three zones with proportional control

This system uses a more productive PU Breezart 1000 LUX per 1000 m³ / h, which is used in offices and cottages. The system consists of 3 zones with proportional control. CB-02 modules are used to control the drives of valves with proportional control. Instead of switches, JLC-100 regulators are used here (externally similar to dimmers). Such a system allows the user to smoothly adjust the air supply in each zone in the range from 0 to 100%.

The composition of the basic equipment of the VAV system (inlet installation and automation)

Note that in one VAV system can simultaneously use zones with 2-position and proportional control. In addition, control can be made from motion sensors - this will allow the air to the room only when someone is in it.

The disadvantage of all considered variants of VAV systems is that the user has to manually adjust the air supply in each zone. If there are many such zones, it is better to create a centralized control system.

Centralized Vav-System

The central control of the VAV system allows you to include pre-programmed scenarios, changing the air supply simultaneously in all zones. For example:

• Night mode. Air is served only in the bedroom. In all other premises, the valves are open at the minimum level to prevent the stress of air.
• Day mode. In all rooms, besides bedrooms, air is served in full. In the bedrooms, the valves are closed or open at a minimum level.
• Guests. Air flow in the living room is increased.
• Cyclical ventilation (Used with a long lack of people). In each room, a small amount of air is served in turn - it avoids the appearance unpleasant odors and stools that can create discomfort when returning people.

VAV system for three zones with centralized control

For centralized valve actuators, the JL201 modules are used, which are combined into a single system controlled by the MODBUS bus. Script programming and management of all modules is made from the regular console. You can connect a carbon dioxide concentration sensor to the JL201 module or the JLC-100 regulator for local (manual) drive control.

The composition of the basic equipment of the VAV system (inlet installation and automation)

The video involves the control of the VAV system with centralized control by 7 zones from the BreeZart 550 LUX supply unit:

Conclusion

On these three examples, we showed general principles Building and briefly described the capabilities of modern VAV systems, more detailed information These systems can be found on the Breezart website.

The CPRK air flow regulators for the circular air ducts are designed to maintain a given air flow rate in the ventilation systems with variable air flow (VAV) or with a constant air flow (CAV). In VAV mode, the air flow setting may vary using the signal from external sensor, controller or from the dispatch system, in CAV mode, regulators support the specified air consumption

The main components of the flow regulators are an air valve, a special pressure receiver (probe) for measuring air flow and an electric drive with an integrated controller and pressure sensor. The difference of complete and static pressure on the measuring probe depends on the air flow through the regulator. The current pressure difference is measured by a pressure sensor built into the electric drive. The electric drive running the built-in controller opens or closes the air valve, maintaining air flow through the knob at a given level.

KPRK regulators can operate in several modes depending on the connection and configuration scheme. Air flow settings in M3 / hour are set when programming at the factory. If necessary, setpoints can be changed using a smartphone (with NFC support), programmer, computer, or controlling system for MP-Bus, Modbus, LonWorks or KNX protocol.

Regulators are available in twelve versions:

• CRCK ... B1 - basic model with support for MP-BUS and NFC;
• CRCK ... BM1 - a regulator with MODBUS support;
• CRCK ... BL1 - Controller with support for LonWorks;
• CPRK ... BK1 - KNX support regulator;
• CRCC and ... B1 is a regulator in a heat / soundproofed case with support MP-BUS and NFC;
• CRCC and ... BM1 - a regulator in the heat / soundproofed housing with the support of MODBUS;
• CRCC and ... BL1 - a regulator in a heat / soundproofed case with support for LonWorks;
• CRCC and ... BK1 - a regulator in the heat / soundproofed housing with a support KNX;
• CPRK-W ... B1 - a regulator in the heat / soundproofed housing and a noisemaker with support for MP-BUS and NFC;
• CPRK-W ... BM1 - a regulator in a heat / soundproofed case and a silencer with MODBUS support;
• CPRK-W ... BL1 - a regulator in a heat / soundproofed case and a noisemaker with support for LonWorks;
• CRCC-W ... BK1 is a regulator in the heat / soundproofed housing and a noisemaker with KNX support.

For the agreed operation of several AC control regulators of the CPRK and ventilation unit It is recommended to use Optimizer - a regulator that provides a change in the speed of the fan rotation depending on the current need. You can connect up to eight KPRK regulators to Optimizer, as well as to combine, if necessary, a few Optimizer in the "Lead-Slave" mode. A variable air flow regulators retain performance and can be operated regardless of their spatial orientation, except when the measuring probe fittings are directed down. The direction of air flow must match the arrow on the body of the product. Regulators are made of galvanized steel. The CPRK-and and CPRK-S models are made in the heat / soundproofed housing with a thickness of isolation 50 mm; The CPRK-W is additionally equipped with a noisemaker with a length of 650 mm on the side of the air outlet. Case nozzles are equipped with rubber seals, which ensures the tightness of the compound with air ducts.

Air flow regulation is part of the process of adjustment of ventilation and air conditioning systems, it is performed using special control air valves. Air flow control in ventilation systems allows you to provide the required influx fresh air In each of the served premises, and in air conditioning systems - the cooling of the rooms in accordance with their thermal load.

For air flow control, air valves, iris valves, a constant air flow system (CAV, Constant Air VOLUME) are used, as well as a system for maintaining an alternating air flow (VAV, VARIABLE Air Volume). Consider these solutions.

Two ways to change air consumption in the air duct

In principle, there are only two ways to change the air flow in the air duct - change the fan performance or output the fan to the maximum mode and create an additional resistance to the movement of the air flow in the network.

The first option requires connecting fans through frequency converters or step transformers. In this case, air flow will change immediately throughout the system. Adjust the air supply to one particular room in this way it is impossible.

The second option is used to regulate air consumption in directions - on floors and by room. For this purpose, various adjusting devices are embedded in the appropriate air ducts, which will be discussed below.

Air shut-off valves, chiebers

The most primitive method for regulating air flow is the use of air shut-off valves and spikes. Strictly speaking, the shut-off valves and seats are not regulators and should not be used to regulate air flow. However, they formally provide regulation at the level "0-1": or the air duct is open, and the air is moving, or the air duct is closed, and the air flow rate is zero.

The difference of air valves from the Sewberries is their design. The valve, as a rule, is a housing inside of which a swivel flap is provided. If the valve turns along the axis of the air duct, it is blocked; If on the axis of the air duct - it is open. The shiber shoe moves progressively, as if the cabinet door doors. Flooring the air duct cross section, it reduces the air flow to zero, and, opening the cross section, provides air duct.

In the valves and in the chibers it is possible to install the damper in the intermediate positions, which formally allows the air flow rate. However, this method is the most inefficient, complexly uncontrollable and most noisy. Indeed, catch the right position of the flap when it is practically impossible, and since the design of the damper does not provide for the function of adjusting the air flow, in the intermediate positions, the shooters and dampers are strongly noisy.

Iris valve

The iris valves are one of the most common solutions for regulating air consumption in the premises. They are round valves with the external diameter of petals. When adjusting the petal is shifted to the valve axis, overlapping part of the cross section. It creates a well-streaming surface with an aerodynamic point of view, which helps to reduce the noise level in the process of adjusting air flow.

The iris valves are equipped with a risk scale, along which you can track the degree of overlap of the live cross section of the valve. Next, measurement of the pressure drop on the valve using a differential pressure gauge is performed. By the magnitude of the pressure drop, the actual air flow through the valve is determined.

Controllers of permanent flow

The next stage of development of air spending technologies - the appearance of constant flow regulators. The reason for their appearance is simple. Natural changes in the ventilation network, clogging the filter, clogging of the outer grille, replacing the fan and other factors lead to a change in air pressure in front of the valve. But the valve was configured to some regular pressure drop. How will it work in new conditions?

If the pressure in front of the valve decreased, the old valve settings are "transmitted" to the network, and the air flow rate will decrease. If the pressure in front of the valve has increased, the old valve settings are "misunderstood" the network, and the air flow rate will increase.

However, the main task of the regulatory system is precisely the preservation of the project consumption of air in all premises throughout life cycle climatic system. And here the solutions are issued to maintain a permanent air flow.

The principle of their work is reduced to the automatic change in the valve cross section depending on external conditions. For this purpose, a special membrane is provided in the valves, which is deformed depending on the pressure at the inlet to the valve and overlaps the cross section while increasing the pressure or frees the cross section when the pressure is reduced.

In other permafrost valves, the spring is used instead of the membrane. Increased pressure in front of the valve compresses the spring. A compressed spring affects the mechanism for regulating the passage section, and the passage section decreases. At the same time, the valve resistance increases, neutralizing high blood pressure to the valve. If the pressure reduced before the valve (for example, due to the filter clogging), the spring is squeezed, and the passage control mechanism increases the passage hole.

The considered air continued air regulators work on the basis of natural physical principles without electronics. There are I. electronic systems Maintaining a constant air flow. They measure the actual pressure drop or air velocity and appropriately change the area of \u200b\u200bthe valve passage.

Systems with variable air flow systems

Systems with variable air consumption make it possible to change the consumption of the supplied air depending on the actual position of the indoor cases, for example, depending on the number of people, the concentration of carbon dioxide, air temperature and other parameters.

The regulators of this species are an electric valve, the operation of which is determined by the controller receiving information from the sensors located indoors. Regulation of air expenditures in ventilation and air conditioning systems is carried out using different sensors.

For ventilation, it is important to ensure the required amount of fresh air indoors. This involves the concentration sensors of carbon dioxide. The task of the air conditioning system is to maintain the desired temperature in the room, therefore, the temperature sensors go to the move.

In both systems, motion sensors or sensors for determining the number of people indoors can also be applied. But the meaning of their installation should be stated separately.

Of course, more man Indoor, the more fresh air should be served in it. But still the primary task of the ventilation system is not to ensure air flow "in humans", but to create a comfortable environment, which in turn is determined by the concentration of carbon dioxide. With a high carbon dioxide concentration, ventilation should work in a more powerful mode, even if only one person is located in the room. Similarly, the main sign of the operation of the air conditioning system is the air temperature, and not the number of people.

However, presence sensors allow you to determine whether it is necessary to maintain this room in currently. In addition, the system of automation can "understand", that "the case for the night", and in the office, it is unlikely that someone will hardly work, and therefore it makes no sense to spend resources on its climate. Thus, in systems with variable air consumption, different sensors can perform different functions - to form a regulatory impact and to understand the need for system work as such.

The most advanced systems with variable air flow systems make it possible to generate a signal to control the fan based on multiple regulators. For example, at one time period almost all the regulators are open, the fan operates in high performance mode. At another point in time, part of the regulators lowered the air flow. The fan can work in more economical mode. At the third point in time, people changed off the deployment, moving out of some rooms in others. The regulators worked the situation, but the total air flow has almost changed, therefore, the fan will continue to work in the same economy mode. Finally, the situation is possible when almost all regulators are closed. In this case, the fan reduces turnover to a minimum or off.

Such an approach avoids constant manual reconfiguration of the ventilation system, significantly increase its energy efficiency, increase the service life of the equipment, accumulate statistics on the climatic mode of the building and its change during the year and during the day depending on of different factors - quantities of people, outdoor temperatures, weather phenomena.

Yuri Khomutsky, technical editor of the magazine "World of Climate"\u003e

Systems with variable air flow (VAV - Variable Air Volume) is energy efficient system Ventilation, allowing to save energy without reducing the level of comfort. The system makes it possible to independently, for each individual room, regulation of ventilation parameters, and also saves capital and operating costs.

The modern base of equipment and automation allows you to create such systems at prices that almost do not exceed the prices of conventional ventilation systems, while allowing you to effectively spend resources. All this is the causes of the increasing popularity of the VAV system.

Consider what the VAV system is how it works, what advantages gives, on the example of the ventilation system of the cottage, with an area of \u200b\u200b250 sq.m. ().

Advantages of variable air flow systems

Systems with variable air flow (VAV - Variable Air Volume), for several decades are widely used in America and Western Europe, Russian market They came quite recently. Users of Western countries highly appreciated the advantage of independent, for each individual room, the regulation of ventilation parameters, as well as the ability to save capital and operating costs.

Vaniable "Variable Air Volume" systems operate in the mode of change in the amount of air supplied. Changing the thermal load of the premises is compensated by changing the volumes of supply and exhaust air at its constant temperature coming from the central supply unit.

The VAV ventilation system reacts to a change in the thermal load of individual rooms or the building zones and changes the actual amount of air supplied to the room or zone.

Due to this, ventilation works when common sense Air flow less than necessary with the total maximum thermal load of all individual rooms.

This ensures a decrease in energy consumption while maintaining the predetermined air quality indoors. Reducing energy costs can be from 25-50% compared to ventilation systems with constant air flow.

Consider the effectiveness on the example of ventilation country house
with an area of \u200b\u200b250 m², with three bedrooms

With a traditional ventilation systemFor residential premises such an area, air flow rate is required about 1000 m³ / h. And in winter it will take about 15 kWh in winter to heating the supply air to comfortable temperature. At the same time, the noticeable part of the energy will be wasted, because people for whom ventilation work cannot be located immediately throughout the cottage: the night they spend in bedrooms, and the day is in other rooms. However, selectively reduce performance traditional system The ventilation in several rooms is impossible, since the balancing of air valves, with which the air supply can be adjusted to the room, is performed at the commissioning stage, and during operation, the cost ratio cannot be changed. The user can only reduce the overall air consumption, but then in the rooms where people are located, it is stuffy.

If you connect the electric drives to the air valves that will remotely control the valve valve position and thereby adjust the air flow through it, then you can enable and disconnect the ventilation separately in each room using conventional switches. The problem is that it is very difficult to control such a system, because Simultaneously with the closure of the parts of the valves, there will have to reduce the performance of the ventilation system on a strictly defined value so that air flow in the rest of the rooms remains unchanged and as a result improvement will turn into a headache.

Using the VAV system Allows you to spend all these adjustments in automatic mode. And so we set the simplest VAV system, which allows you to separately turn on and turn off the air supply in the bedrooms and the rest of the room. In the night mode, the air is fed only in the bedroom, hence the air flow rate is about 375 m³ / h (at the rate of 125 m³ / h for each bedroom, pl. 20 m²), and energy consumption of about 5 kWh, that is, 3 times less than in the first version.

Having received the possibility of separate management, in different rooms you can supplement the system with means of the latest climatt automation, so the use of valves with proportional electric drives will make control of smooth and even more convenient; And if you connect the inclusion / flooding of air supply at the signal of the presence sensor, we get an analogue of the "smart eye" system used in domestic split systems, but in a completely new level. For further atomatization, the temperature, humidity, concentrations of CO2, etc. can be embedded in the system, which in the end - not only will preserve energy, but at the same time will significantly increase the level of comfort.

If all automatic blocks that control the electric valves are connected to connect a single bus control, then the possibility of centralized scenario management of the entire system will appear. So, you can create and set individual modes of operation for different rooms, in different life situations, So:

at night - the air is supplied only in the bedroom, and in the rest of the rooms the valves are open at a minimum level; day- The air is served in the rooms, kitchen, etc. room, except sleeve. In the bedrooms, the valves are closed or open at a minimum level.

whole family to gather - air flow in the living room increase; in the house none - Cyclic ventilation is configured, which will not allow smells and dampness, but the resources will save.

For independent control, not only the volume, but also the temperature of the supply air in each of the premises, you can install warmers (low-power calorifers), controlled from individual power regulators. This will allow the air to be served with the minimum permissible temperature (+ 18 ° C), individually heating it to the desired level in each room. That technical solution It will allow to reduce energy consumption even more, and bring us to the Smart Home system.

The scheme of the work of such a system, rather the issue of the profile specialist, so here we will give only one, the simplest scheme (working and erroneous options) with the explanation as it works. But except simple Systems, essential and more complex options allowing you to create any VAV systems - from domestic budget systems With two valves to multifunctional ventilation systems administrative buildings With the floor management of air flow.

Call the specialists of the company "OVK Engineering" will advise, help choose optimal option, design and install a VAV system, ideally suitable for you.

Why VAV systems must install specialists

The easiest way is to answer this question, on the example. Consider the typical configuration of the system with variable air flow and error that can be approved during its design. The illustration shows an example of the correct configuration of the VAV aircraft network:

1. The right scheme of the VAV system with variable air consumption

In the upper part there is a controlled valve that serves three rooms (three bedrooms from our example) \u003d\u003e In these rooms, a manual throttle valves are installed for balancing at the commissioning stage. The resistance of these valves will not change * in the process of work, so do not affect the accuracy of maintaining air flow.

A manual control valve is connected to the trunk air duct, which has a constant air flow P \u003d const. Such a valve may be needed to ensure normal operation of the annotation in the case when all other valves are closed. \u003d\u003e Air duct with this valve is displayed with a permanent air supply.

Scheme is simple, working and efficient.

Now consider errors that can be allowed when designing the airconducting network of the VAV system:

Error branches of air ducts are highlighted in red. Valves №2 and 3 are connected to the air duct coming from the branching point to the VAV valve No. 1. When changing the position of the valve flap No. 1, the pressure in the air duct near the valves No. 2 and 3 will be changed, so the air flow through them will not be permanent. The controlled valve No. 4 cannot be connected to the main air duct, since the change in air flow through it will lead to the fact that the pressure P2 (at the point of branching) will not be constant. A valve number 5 cannot be connected as shown in the diagram for the same reason as valves No. 2 and 3.

* Of course you can configure a controlled airflow for each bedroom, but in this case there will be more complex schemewhich we do not consider within this article.

Ginger Valve with servo

Thanks to a unique design throttle valvesThe air flow can be measured and adjusting within one device and one process, delivering a balanced amount of air into the room. The result is a constant comfortable microclimate.
Iris throttle valves allow you to quickly and accurately adjust the air flow. We cope everywhere where individual comfort control and precision air control are needed.
Measurement and adjustment of the flow to ensure maximum comfort
Balanting the air flow is usually a time-consuming and expensive action when starting the ventilation system. Linear air flow restriction, characteristic of lenzovy throttle, simplifies this operation.
Production of throttle valve
Iris throttle valves can function both in the supply and exhaust installations, eliminating the risk associated with errors of incorrect installation. Iris lens throttle valves consist of galvanized steel housing, lens planes, adjusting air flow, lever for smooth change in the diameter of the hole. In addition, they are equipped with two tips to connect a device that is measuring the air flow tool.
Throttle valves are equipped with EPDM rubber seals for a dense connection with ventilation channels.
Thanks to the engine mount possible automatic control Flow without the need to manually change settings. A special plane is provided for stable servomotor mounting, protecting it from moving and damage.
What distinguishes lens throttle from standard throttle valves?
Conventional throttle valves increase air flow speed along the walls of channels, which makes a large noise. Thanks to the lens closing of Iris throttle valves, the suppression does not cause turbulent and noise in the channels. This allows you to increase streams or pressure, compared with standard throttle valves, without noise in installation. This is a great simplification and savings, because There is no need to apply additional soundproofing elements. The corresponding jurisdiction of noise is possible by correct installation of throttle valves in the ventilation system.
For precision measurement and control of air flow, throttle valves should be placed on straight segments, not closer than:
1. 4 x duplex air duct before throttle,
2. 1 x duplex duct behind throttle valve.
The use of lenzo throttle valves is very important to provide ventilation installation hygiene. Thanks to the possibility of full discovery, the sewage robots can successfully get into the channels connected to this kind of throttle valves.
Advantages of Iris throttle valves:
1. Low noise in channels
2. Simple installation
3. Excellent equiliblation of air flow, due to the measuring and regulating unit
4. Simple and fast stream adjustment without need additional devices - Apply the handle or servomotor
5. Accurate flow measurement
6. Smooth adjustment - manually using a lever or automatically by applying the version with the servomotor
7. Design allowing easy access for cleaning robots.