Ventilation design features of clean rooms. Cleanroom ventilation: what you need to know when designing. The task of the climate system for "Clean Rooms"
FAVEA provides design, supply and installation of ventilation and air conditioning systems for clean rooms, including control and dispatching units for these systems.
General principles
The main task of ventilation and air conditioning systems is to create and maintain the following parameters in clean rooms:
Air cleaning
Before being supplied to clean rooms, the air passes through a 4-stage filtration system. Coarse and fine filters are located in the central air conditioner. Ultra-fine filters, the so-called HEPA and ULPA filters, are located directly in the air outlets, i.e. before air enters the clean room. These filters are capable of capturing particles as small as 0.01 µm.
Laminar air flow
To create local clean zones, a unidirectional (laminar) air flow is used. In this flow, the movement of air occurs in one direction and "displaces" aerosol particles from the clean zone. Also in the laminar flow there are no turbulences and mixing of air flows, which allows the particles to stay in the flow field for a minimum time.
Laminar flow is achieved through the use of special laminar air diffusers and laminar ceilings, which are part of the ventilation and air conditioning system.
Central air conditioner for clean rooms
The main element of any ventilation and air conditioning system is a central air conditioner - a device in which air is completely prepared before it is supplied to the premises.
For clean rooms, central air conditioners in a special "hygienic" design are used.
A standard central air conditioner consists of a housing in which the following elements are placed: a set of filters, heat exchangers for heating, cooling and dehumidifying the air, an air humidifier, fans for supplying air to and removing air from the premises.
Automation and dispatching of ventilation and air conditioning systems
To control the central air conditioners, as well as the entire ventilation and air conditioning system, the complex provides for automatic regulation, control and dispatching systems.
The automatic regulation and control system allows:
- maintain and regulate the main parameters of the system, such as temperature, humidity, fan speed, pressure drops;
- protect the heat exchangers of central air conditioners from freezing during low temperatures outdoor air;
- signal the occurrence of emergencies, such as a fan failure or the need to replace the filter.
To organize the operation of such systems, various sensors, relays and programmable controllers are mainly used, which are an integral part of any modern ventilation and air conditioning system.
The dispatching system serves to display the data of the systems operation from the controllers on the screen of a personal computer, with the ability to control the system parameters from this computer.
FAVEA implements systems dispatch control as part of automated systems and performs integration with external systems, such as power supply, lighting, fire and security alarm, elevator equipment, etc. Dispatching systems provide, among other functions, multi-level user authorization, storage of parameters of all processes with maximum detail, constant monitoring of communication with controllers, the possibility of remote access via the Internet or via local network without special additional software, multilingual interface.
Automated systems are built on the basis of modern controllers, sensors, control valves and drives and electrical components from leading manufacturers such as Siemens, Sauter, Schneider Electric, Eaton, Legrand, Danfoss, Belimo and many others. others
Our systems are highly energy efficient due to the great attention paid to the most accurate adjustment of the regulators, the use of modern control algorithms and the ability to set detailed work schedules and automatic change of set values.
Our specialists have a wealth of successful experience in solving non-standard tasks of automating various equipment, developing concepts and complex control algorithms to meet all the requirements and wishes of the customer.
Raymond K. Schneider, Senior Cleanroom Consultant and CEO of Practical Technology, USA, Fellow of the American Society of Heating, Refrigeration and Air Conditioning Engineers (ASHRAE)
The design of ventilation and air conditioning systems for clean rooms has a number of features. Below is an article by a well-known American cleanroom specialist, Mr. Raymond K. Schneider, which analyzes the requirements for ventilation systems for rooms of various cleanliness classes: from 1 to 9. The solutions proposed by the author, based on his extensive practical experience, deserve careful study and use where possible.
Air conditioning systems for clean rooms must supply purified air in a certain amount in order to maintain a given level of cleanliness in the room. Air is supplied to clean rooms in such a way as to prevent the formation of stagnant zones where dust particles can settle and accumulate. The air must also be conditioned in terms of temperature and humidity in accordance with the requirements for the parameters of the microclimate of the room. In addition, an additional amount of conditioned air is supplied to the room to create excess pressure.
This article discusses the design of air conditioning systems for clean rooms. In order to simplify the presentation of the material, the level of maintenance of cleanliness in the premises is divided into three categories: hard, medium and moderate (see table).
Air exchange
The calculated value of the supply of purified air is maximum for premises with a strict cleanliness regime and decreases as the requirements for purification decrease. Air exchange in rooms is usually expressed either in terms of air mobility in the room, or in terms of multiplicity (rpm / h).
Average indoor air mobility is usually used when the air is supplied through a filter ceiling. For many years, an air mobility of 0.46 m/s ± 20% was accepted as the highest level of purity. This was based on the first clean room designs carried out as part of the 1960–1970 space programs.
Recently, experiments have been carried out with lower velocities, which have shown that air mobility in the range of 0.35–0.51 m/s ± 20% is quite acceptable, depending on the type of activity and the installed equipment. The upper limit of air mobility corresponds to the high activity of personnel and the presence of dust-producing equipment. Lower values are accepted if there is little sedentary work and/or no dust-generating equipment.
Frequently knowledgeable customers with experience in cleanrooms will set low level air mobility values. And customers and novice designers, unaware of the feasibility of lower speeds, set air mobility at the upper end of the scale. There is no unambiguously defined average level of air movement or air exchange rate accepted in the industry for clean rooms according to this classification. The only exception is the FDA (Food and Drug Administration) air mobility value of 0.46±0.1 m/s for sterile areas in the pharmaceutical industry.
The standard air exchange values for clean rooms with medium and moderate air cleanliness are more common. For rooms with an average level of cleanliness, the recommended air exchange is between 30 and 60 rpm / h, while for a moderate level, air exchange can be reduced to 20 rpm / h. The designer chooses the air exchange value based on his experience and understanding of the dust generation in the production process. Recently, there has been a tendency to take lower values of air exchange; leading design and construction firms and prudent customers have successful experience in working with such parameters.
The Microclimate Institute Code of Practice (IEST-CC-RP.012.1) has a table of recommended air exchange values for each cleanliness class; similar values were later published in ISO 14644-1, clause 4. These data are given in the table. Both documents are consistent with each other and represent the joint recommendations of designers, builders and users, proven by years of successful work. In all these documents, the responsibility for the choice of parameters rests with the "sellers" and "buyers" of clean rooms, so it is advisable to exercise some caution when using the above recommendations.
Picture 1.
Figure 2.
Filters
For many years, clean room technology has been developed to serve the microelectronics industry. The need for high efficiency air filters is dictated by the needs of this industry and related industries. The ULPA (Ultra High Purity) filter, which has an efficiency of 99.9995% on 0.12 micron particles, has been successfully used in harsh cleanrooms. Higher efficiency filters exist, but they are expensive and not widely used. Filters with 99.99% and 99.999% efficiency are available from several manufacturers; experience shows that they can also be used for hard mode.
HEPA (High Efficiency Purification) filters with 99.97% efficiency on 0.3 micron particles have been the workhorse of the clean room industry for many years. They are still widely used in the pharmaceutical industry, where the requirements for air purity are even more stringent.
When filters were laboratory tested with accurate particle counts, HEPA/ULPA filters were found to generally pass 0.1-0.2 microns. At the same time, the passport efficiency of filters for fractions of 0.12 and 0.3 microns was confirmed, and an even higher efficiency was found for particles that are larger and smaller than the indicated sizes. For the strict regime of purity standardization, when setting the filter efficiency, it is customary to indicate not the values of 0.12 and 0.3 microns, but the particle size of the fraction that is filtered worse than the others (MPPS). MPPS values vary slightly between filter manufacturers. Specifying the efficiency by the size of the worst filtered particles is considered by some designers and manufacturers to be the most convenient.
Most hard and medium clean rooms are equipped with filters in the ceiling. Filters can be grouped and attached to a common module supply system, which facilitates installation in the ceiling, or can be installed separately, with individual supply air ducts. This arrangement, resembling an inverted "T", forms a honeycomb structure under the ceiling. At the same time, the filters are carefully sealed in the housing to prevent the passage of uncleaned air. In addition, filters built into supply chambers are still used. However, the modular schemes that displace them make it possible to better ensure the regulation of air parameters and mobility.
Blocks "filter-fan" are widely used. In some designs, the filter is replaceable, in other cases, the entire unit is replaced at the end of its service life. Various standard sizes are offered for delivery for embedding in a honeycomb structure. The fans are equipped with electric motors designed for different voltages, which allows the use of various power supply schemes. Some complex systems controls include the possibility of individual adjustment of each unit, registration of energy consumption, signaling of malfunctions of electric motors, regulation of groups of filter fans and changing the speed of rotation of fans according to the time of day. Blocks "filter-fan" are used for all classes of clean rooms.
Frontal air velocity for ceiling filters can be from 0.66 to 0.25 m/s, depending on the project. Since the system with cellular placement of filters of the “T” type occupies 20% of the ceiling area, the frontal speed of the filters of 0.51 m/s corresponds to average speed in the working area of the room 0.41 m/s.
Installing HEPA/ULPA filters directly in the ceiling of cleanrooms is dictated by the intention to minimize or eliminate the possibility of dust accumulation on any surfaces (for example, on the walls of air ducts) along the path of air from the filter to the cleanroom. The remote placement of HEPA filters is typical for moderate-mode clean rooms, since the amount of particles blown off the walls of the air ducts after the filters is within acceptable limits. The exception is when a standard air conditioning system, not certified for clean rooms, is converted for this purpose in accordance with ISO 14644. In this case, all air ducts after the filters must be thoroughly cleaned.
For moderate duty cleanrooms, fan boxes or mixboxes with HEPA filters on the discharge side are often used. At the same time, the frontal air velocity in the HEPA filters reaches 2.54 m/s, which corresponds to a greater pressure drop than with a ceiling installation. The aerodynamic resistance of a clean HEPA filter with a size of 600x600 mm is 375 Pa at a frontal speed of 2.54 m/s. With ceiling installation, the frontal speed is 0.51 m/s, aerodynamic drag- 125 Pa.
Air circulation in clean rooms
The air entering the clean room after being cleaned with HEPA and ULPA filters is practically free of suspended particles. The air supply to the room is made for a dual purpose. Firstly, the "dissolution" (decrease in concentration) of dust pollution arising from the presence of people and the performance of production processes. Secondly, the capture and removal of these contaminants from the premises.
There are three types of indoor air circulation:
1. Unidirectional ordered flow (previously called "laminar"), when the streamlines of all air jets are parallel.
2. Disordered flow (previously called "turbulent"), when the streamlines are not parallel.
3. Mixed flow, when in one part of the room the air jets can be parallel, but not in the other part.
Hard mode cleanrooms typically use unidirectional flow. This is achieved by installing HEPA / ULPA filters throughout the ceiling area and installing a perforated raised floor. The air moves vertically from the ceiling to the floor, is removed through the perforation into the exhaust chamber under the floor. The recirculated air is then fed back into the room through the peripheral recirculation ducts.
If the cleanroom is narrow (4.2-4.6 m), wall-mounted exhaust grilles installed at the bottom are used instead of a raised floor. Air is supplied from above and moves vertically to a level of 0.6–0.9 m, then the flow spreads towards the gratings. Such circulation is considered acceptable for rooms with a strict regime, especially in cases where there has been a conversion of the room into a clean room in the presence of dust in the upper zone.
In rooms with an orderly circulation, the placement of furniture and equipment affects the structure of the air flow. To reduce the impact of these items on the cleanliness of the room, it is necessary to place them in such a way that stagnant zones with dust accumulation do not form.
Random air movement is common in medium duty clean rooms. HEPA filters are placed evenly over the ceiling surface. The air flow is generally directed from top to bottom. However, the direction of individual jets is different and does not fit into a certain pattern. While the supply air contains practically no suspended particles, their appearance and accumulation in the working area of clean rooms depends on the amount of particles generated in the room itself; from reducing the concentration of dust due to air exchange; the intensity of entrainment of particles from the working area. In general, we can say that the more air exchange, the cleaner air in medium-mode rooms, however, the structure of the air flows in the room also plays a role.
The air removal scheme for rooms with disordered circulation is very important. In such rooms, wall-mounted exhaust grilles are widespread. They should be evenly distributed around the perimeter of the room. This requirement may conflict with the accepted layout of equipment along the walls. Where possible, equipment should be moved away from walls to allow air to flow behind it. It is also advisable to raise the equipment above the floor, placing it on a platform so that the air passes from below. In most cases, cleanroom designers aim to direct the air flow from the countertop to the floor and then to the low exhaust grilles. With this scheme, particles are removed from the room and sent to the filters, where they are captured. An exception may be such cases when particles of pollution are generated by equipment above the working area. Then some device should be used to catch the removal and particles at the top. In the general case, it is recommended to use a top-down air distribution scheme.
In rooms with a medium level of cleanliness, it is reasonable practice to limit the horizontal sections of airflow. The recommended values of horizontal sections are no more than 4.2–4.8 m. Thus, in a room with a width of no more than 8.4–9.6 m, it is permissible to install exhaust grilles along the perimeter of the walls. This limitation is dictated by the fear of secondary pollution during deposition or other transfer of particles into the working area from extended horizontal flows.
In wider rooms, it is customary to install exhaust grilles and air ducts in ducts mounted along the columns. If there are no columns in the room, vertical shafts are created from a suitable material.
In rooms of moderate cleanliness with remote installation of HEPA filters, standard ceiling air outlets of air conditioning systems can be used. The air circulation scheme is also similar to that adopted in air-conditioned rooms.
According to the “top-down” circulation scheme in practice for clean rooms, it is also recommended here bottom installation wall exhaust grilles. When the exhaust grilles are placed at the top, areas with a high concentration of suspended particles can form in the working clean area, especially during periods of intensive work. In the known cases of installation of ceiling exhaust grilles in moderate duty cleanrooms, the success was most likely due to the low level of particle generation in the room, rather than the efficiency of the air distribution system.
Mixed circulation is used when work is performed in the same room with critical and non-critical requirements for air purity. If it is impossible to ensure the performance of work with critical requirements in a separate room, then a common clean room with cleanliness zoning can be used. Zones are created by appropriate grouping of ceiling filters. In the zone with critical conditions for purity, the number of filters is greater, in the zone with non-critical conditions - less. In addition, the supply of fresh air can be carried out in such a way that it is first supplied through the air ducts to the critical zone, and then enters the rest of the room. Depending on the height of the clean room, a 0.6 m high plexiglass shelter or a plastic curtain that does not reach the floor by 304–457 mm can also be installed.
The direction of the exhaust air flows is regulated by the appropriate placement of the exhaust grilles in such a way as to prevent the transfer of contaminants throughout the room. A raised floor with a prefabricated exhaust air collector installed under it will be very effective in this case. However, the application of such a solution may be hindered limited budget a customer who chooses a mixed-circulation zoned clean room design precisely because of its low cost.
The disadvantage of disordered air circulation in clean rooms is the appearance of areas with high dust content. Such areas may exist for a limited time, then disappear. This occurs due to the interaction of air flows resulting from production activities and disordered supply jets. Attempts have been made to reproduce unidirectional circulation by installing a false ceiling-air distributor and creating a zone high blood pressure between the main and false ceiling. For this, perforated plastic or aluminum panels and a screen made of woven and non-woven materials were used.
As a result, an ordered unidirectional flow was formed in the room with velocities much lower than in clean rooms with a hard regime. The displacement effect created by the supply air flow prevents the formation of dusty areas and, in general, allows you to achieve more high level purity. The specified result, as noted above, is achieved at a lower air mobility than indicated in the standards for hard and medium cleanliness (Fig. 1).
Thermal load
The share of sensible heat in the heat load of clean rooms is typically over 95%. As a rule, year-round cooling is required, since the heat generated by the technological equipment and electric motors for circulation fans. A small proportion of latent heat generation is generated by the presence of personnel. A unique project is developed for each clean room, so all the factors influencing heat load, should be carefully analyzed.
In rooms with strict and medium levels of cleanliness, a significant part of the supply air is not treated by air conditioners - this is recirculated air. The required sensible heat removal is carried out in the mixing and distribution chambers, where part of the total flow is cooled in surface heat exchangers and then returned to the general flow to the recirculation fans (Fig. 2). The inlet air temperature to severe cleanrooms can only be a few degrees lower than the exhaust air temperature due to the large inflow volume. This temperature difference allows the use of ceiling-mounted HEPA/ULPA filters with top-down air supply without compromising worker comfort.
In rooms with a moderate cleanliness regime, the requirements for air distribution in the room are in some cases the same as in ordinary refrigerated rooms. Thus, the temperature difference between supply and exhaust air can be 8–11 °C. In these cases, standard ceiling diffusers or other means are used to prevent unpleasant blast and ensure comfortable conditions in the room.
Outside air supply
The supply of outside air is necessary to compensate for the exhaust and exfiltration that always occurs in pressurized cleanrooms. Outdoor supply air is expensive, because before being supplied to clean rooms, it must not only be cleaned, but also subjected to temperature and humidity treatment. Since it is not possible to completely eliminate the supply of outside air, for reasons of overall economy and energy saving, its amount should be kept to a minimum.
The air pressure in clean rooms is usually increased relative to the surrounding areas. As a rule, a pressure drop of 12 Pa is recommended. Higher overpressure causes whistling noise in the gaps and difficulty in opening the doors. In blocks of clean rooms with different cleanliness classes, it is customary to maintain a pressure difference of 5 Pa between adjacent rooms, while a higher pressure is maintained in a room with a higher cleanliness class.
The amount of outside air is determined by summing the exhaust volume for all production processes and increasing the resulting multiplicity by 2 rpm/h. This semi-empirical value is a practice-proven calculated amount of air for the selection of air conditioning equipment. The actual amount of outside air will be variable, depending on door openings, leaks, and the actual operation schedule of the hood.
The outdoor air conditioner is designed to bring its parameters in line with the standards for clean rooms. This means that it must be possible to clean the air, preheat, cool, reheat, dehumidify and humidify.
In clean rooms with a strict regime, three stages of outdoor air purification are often done: preliminary - an ASHRAE filter with an efficiency of 30%, an intermediate filter with a 95% efficiency, and a final one - a HEPA filter. In clean rooms with a medium and moderate regime, as a rule, there are two stages of cleaning: preliminary (30%) and final (95%). From the name it is clear that the final filter is placed at the outlet of the air conditioner.
Preheating is necessary when the outside temperature drops below 4 °C in winter. If the dew point temperature of the air in the clean room is ≥5.6 °C, the surface heat exchanger cools and dehumidifies the supply air. Since workers in strict cleanrooms always wear overalls, the dry bulb temperature can be kept below 19°C, with a minimum relative humidity setting of 40% for the regulators. The second heating is necessary in order to increase the temperature of the supply air after cooling and dehumidification in the heat exchanger. When calculating the amount of heat for the second heating, heat inputs from recirculation fans are taken into account. This is a significant value for clean rooms with a strict regime.
Reducing the heat exchanger surface temperature to the level required to keep the room dew point below 5.6°C can be difficult. When dehumidification of supply air below 40% RH is required, various desiccant agents are commonly used.
In the system described here, the outdoor air conditioner is loaded with latent heat and moisture in the room. It is assumed that the parameters of the supply air meet the requirements for the assimilation of latent heat emissions introduced by the room staff and moisture inflows through the clean room fences. It is also assumed that the latent heat load is more or less constant. These assumptions must be checked for each specific project. It is necessary to take into account the conditions in the rooms surrounding the clean room, the parameters of the outdoor climate, the possibility of moisture release from production processes in the room.
In small volume cleanrooms with little outside air demand, the recirculation air coolers in the mixing chambers discussed above can also be used to treat outside air. In this case, a mixture of outdoor and recirculated air is processed. The proportion between these supply air components is controlled by mixing valves depending on the pressure in the clean room. If the pressure drops, the outside air valve opens and the recirculation valve closes. The air from the mixing and distributing chambers is supplied to the circulation fans.
In moderate cleanrooms, the total supply air required can be close to the conditioned air flow. In this case, additional circulation fans are not installed, the air is moved through the system only by the fans of one or more air conditioners.
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New classification ISO cleanroom is shown on the left. The classification according to US Federal Standard 209E in Anglo-American and metric units is also given. The "Recommendations" column contains three categories according to the classification of the author of this article. Note that "Class 100" can be assigned to a hard mode when the design provides for ordered circulation, or to an average mode if disordered circulation is designed for non-critical conditions. The two columns on the right give recommendations for room air mobility (ft/min) and air exchange (rev/h) for medium and moderate modes. |
findings
There is a tendency in cleanroom design regulations to assign the functions of a general expert to the designer, capable of fulfilling all the wishes of the customer (as far as he knows). The manuals usually use the expression "a matter of agreement between the buyer and the seller" in order to involve the customer in the decision-making process, since each developer can offer his own version of the project. The effectiveness of the design principle discussed in this article has been proven in practice; This approach, in the opinion of the author, makes it possible to harmonize technical requirements and the possibility of their implementation. These recommendations, like any others, must be adapted in each case to the specific conditions of use.
Reprinted with abridgements from the magazine ASHRAE.
Translation from English O. P. Bulycheva.
Scientific editing performed by Ph.D. tech. Sciences A. P. Inkov
In the design of any clean room, a significant place is given to the ventilation system. The ability to maintain the required level of purity without much effort depends on how well the air will be cleaned. Incorrectly equipped ventilation of cleanrooms can negate all efforts to equip them.
Our company has been specializing in the design and installation of air circulation and purification systems for clean rooms for a long time, so employees use only modern techniques and tools. And this is the key to a successful and durable service of the system as a whole.
| ISO class (classification number N) |
Limits of maximum concentrations (particles / m3 of air) of particles with a size equal to and greater than the one below, microns |
Mk | |||||
| 0,1 | 0,2 | 0,3 | 0,5 | 1,0 | 5,0 | ||
| ISO class 1 | 10 | 2 | - | - | - | - | nd |
| ISO class 2 | 100 | 24 | 10 | 4 | - | - | nd |
| ISO class 3 | 1 000 | 237 | 102 | 35 | 8 | - | nd |
| ISO class 4 | 10 000 | 2 370 | 1 020 | 352 | 83 | - | nd |
| ISO class 5 | 100 000 | 23 700 | 10 200 | 3 520 | 832 | 29 | 5+ |
| ISO class 6 | 1 000 000 | 237 000 | 102 000 | 35 200 | 8 320 | 293 | 50 |
| Class7 ISO | - | - | - | 352 000 | 83 200 | 2 930 | 100 |
| Class 8 ISO | - | - | - | 3 520 000 | 832 000 | 29 300 | 100 |
| ISO class 9 | - | - | - | 35 200 000 | 8 320 000 | 293 000 | 500 |
What is Cleanroom Ventilation Installation?
This element of building equipment with the need to create elevated conditions purity, currently developed modern systems for air circulation and filtration. For this purpose, it is applied a large number of elements directly to ensure the supply and exhaust of air, a group of filters and equipment for scheduling control.
All this should be in a clean room without fail, since this equipment allows you to solve a group of important tasks:
Maintaining aerosol particles in the air within acceptable limits.
Control and creation of indicators of the correct microclimate in the room, such as humidity, temperature, air mobility.
Prevention of pressure drops between cleanrooms and the rooms that adjoin them.
Regular supply of clean air into the room and removal of air stagnant there.
With the help of innovative systems, all this works automatically and does not require much effort on the part of the employees of the premises. Manufacturers of modern ventilation equipment guarantee a long service life, and are constantly improving it so that the operation of the devices creates a minimum of noise and does not interfere with the comfortable stay of people in the room.
How the system works
The ventilation of the clean room works properly and allows you to provide all the regulatory indicators due to the correct organization of all elements of the system:- · Before air enters the room, it goes through 4 stages of filtration on 4 different filters, each of which purifies the flow from a certain group of contaminants.
· A laminar air flow is provided, which allows the creation of a directed movement of purified air, which in turn displaces aerosol particles from the already existing air.
· The main element of the entire installation is the central air conditioning system, created in a special "hygienic" design. It is here that most of the cleaning and air preparation processes take place.
· It is easy to manage and maintain constant indicators of cleanliness in the room allows equipment for automating and scheduling the operation of the entire system, which includes a lot of sensors for monitoring indicators, elements of remote command transmission, etc.
The state of operation of all devices in the system after its commissioning is easily controlled by employees working in the room, and in the presence of any deviations in operation or emergency situations, software will let you know quickly.
The main task for the correct functioning of such equipment is the competent initial design and installation. Otherwise, the owners and employees do not have the slightest problem.
Features of offers from our company
We will help to avoid mistakes in the preparation and installation of ventilation equipment for each client, since only specialists of the highest category work in the company. In addition, the product catalog contains exclusively modern and reliable elements of ventilation systems.
If you contact us, you will receive:
· A system integrated with related systems such as power supply, software, etc.
Energy efficient equipment that will operate under minimal cost electricity, and, accordingly, financial investments.
· Equipment that operates with minimal noise and does not cause discomfort to everyone in the room.
· Reliable equipment of the room with certificates of quality and with a guarantee.
Our experts will help you choose optimal solution for each specific room, which will reduce financial investments and achieve maximum efficiency. All this enables us to assert that ventilation systems, ordered from us, will last for many years and will not create problems.