Efficient operation of the ventilation system c. Certification and testing of the efficiency of ventilation systems in the cities of Tyumen, Novosibirsk, Omsk. Checking the effectiveness of ventilation in a medical facility

Commissioning of newly built or reconstructed facilities. the federal law dated December 30, 2009 N 384-FZ "Technical regulations on the safety of buildings and structures." Article 20. Requirements for ensuring air quality: “The design documentation of buildings and structures must provide for equipping buildings and structures with a ventilation system. The design documentation for buildings and structures may provide for equipping premises with an air conditioning system. Ventilation and air conditioning systems must ensure supply to indoor air containing harmful substances not exceeding the maximum permissible concentrations for such premises or for the working area of ​​industrial premises."

Survey of existing ventilation systems in accordance with the current requirements of Rospotrebnadzor and Rostechnadzor. For compliance with thematic GOSTs, SanPiNs, RDs and other regulatory documents.

Inspection of ventilation systems to develop measures to improve working conditions.

Only a licensed/certified/accredited organization can conduct ventilation efficiency assessments. Procedures confirming the effectiveness of ventilation systems are activities that require special skills and knowledge of the regulatory framework.

1. Buildings and premises with constant presence of people, without the emission of harmful gases and dust, equipped with a microclimate maintenance system. Such objects include almost all modern office buildings and shopping centers.
2. Industrial buildings and premises releasing pollutants into the air of the working area.
3. Premises with special requirements to the composition of the air environment and microclimate: kindergartens, hospitals, schools.

As you can see, ventilation is used in almost every building and room.

1. Periodic ventilation of rooms through windows and doors.
2. Ventilation with natural and mechanical draft stimulation.
3. Systems air heating and conditioning.

Ventilation is a sanitary and technical means that completes the system of measures to improve the air quality of indoor spaces. With the help of ventilation, they combat excess heat and moisture, as well as gases, vapors and dust.

Direct methods include the speed and temperature of air flows, productivity, developed pressure and fan speed, pressure difference or vacuum, noise and vibration of ventilation system elements, concentration of harmful substances in the supply air.

TO indirect methods include – assessment of air environment compliance production premises sanitary standards regarding the concentration of harmful substances in the air of the working area, temperature, relative humidity and air mobility, and the intensity of thermal radiation.

The effectiveness of ventilation is checked by measuring the temperature and air flow speed in work area, open openings and working sections of air intake devices, as well as installation, transport and aeration openings, in supply jets from air distribution devices, air showers and curtains, as well as determining the performance of fans and the pressures they develop in supply and air ducts exhaust systems, general exchange, local suction and aspiration shelters built into the equipment and measuring the pressure difference or vacuum in production premises relative to neighboring premises or atmosphere, in cabins, boxes, shelters.

Performance of ventilation systems of local suction, aspiration shelters, etc. determined by the formula:

L = Vav*F*3600 m3/hour,

Where Vav is the average speed, m/s, F is the cross-sectional area of ​​the opening, air duct, local suction. 3600 is the number of seconds in one hour.

Based on the results of the measurements, a ventilation system passport is drawn up, which is used as the final stage of certification ventilation units. Also, only a protocol of instrumental measurements can be drawn up if a passport for the ventilation unit is already available.

The ventilation unit passport is the main document in which all test results, parameters of the studied environment are recorded (humidity level, temperature, chemical composition air and its mobility). The passport gives the right to official use of a specific object, confirms the completion of all the necessary complex of design, adjustment and testing works. Certification is needed to register purchased ventilation equipment (this is especially true for public and industrial buildings), to confirm that the requirements of sanitary standards are met.

One of the conditions for proper operation of ventilation systems is constant production control, or assessment of their effectiveness. It is carried out to identify pressure losses and unaccounted air flow. Periodic evaluation of ventilation performance is an important part of its use.

The main purpose for measuring ventilation efficiency is to detect problems and malfunctions that pose a danger to people in the premises and the entire building as a whole.

The secondary objectives of the audit are:

• assess whether the calculations were made correctly at the design stage of the ventilation system;
• find out whether existing installations cope with loads well enough and how they maintain traction;
• find opportunities for energy saving and reduction of system operating costs;
• confirm compliance with the standards and requirements of sanitary and epidemiological, technical supervision, and fire authorities;
• recalculate the parameters of the system after its modification, reconstruction, repair;
• successfully pass passport certification.

To ensure that excess amounts of carbon dioxide do not accumulate in the premises, people remain able to work, do not feel drowsiness, malaise, or dizziness, ventilation ducts must be clean and passable. Complete air exchange is especially important where there are conditions for the formation high humidity(kitchens, saunas, showers, swimming pools) - in a favorable environment for them, bacteria, mold and mildew quickly multiply.

For production, warehouse and laboratory complexes, assessing the efficiency of ventilation systems is also necessary. If explosive, volatile, toxic and flammable substances are not removed from the premises, this will lead to dramatic consequences. The equipment can work, but does not completely extract all the polluted air, it is difficult to supply fresh air from the outside, which negatively affects the microclimate in the premises.

Basic regulations regulating the need and procedure for assessing the effectiveness of ventilation systems:

• Federal Law "On the Sanitary and Epidemiological Welfare of the Population" dated March 30, 1999 N 52-FZ;
• GOST 12.4.021-75 System of occupational safety standards (SSBT). Ventilation systems. General requirements(with Amendment No. 1);
• GOST 12.3.018-79 System of occupational safety standards (SSBT). Ventilation systems. Aerodynamic test methods;
• GOST 12.1.005-88 System of occupational safety standards (SSBT). General sanitary and hygienic requirements for the air of the working area (with Amendment No. 1);
• GOST 30494-2011 Residential and public buildings. Indoor microclimate parameters (with Amendment);
• GOST R 52539-2006 Air purity in medical institutions. General requirements;
• GOST R EN 13779-2007 Ventilation in non-residential buildings. Technical requirements to ventilation and air conditioning systems;
• SanPiN 2.2.4.548-96 Hygienic requirements to the microclimate of industrial premises;
• SanPiN 2.1.2.2645-10 "Sanitary and epidemiological requirements for living conditions in residential buildings and premises";
• SanPiN 2.1.3.2630-10 “Sanitary and epidemiological requirements for organizations engaged in medical activities” (as amended as of June 10, 2016);
• SP 73.13330.2016 (SNiP 3.05.01-85) Internal sanitary systems of buildings;
• SP 60.13330.2012 Heating, ventilation and air conditioning. Updated version of SNiP 41-01-2003;
• SP 1.1.1058-01 Organization and conduct of production control over compliance sanitary rules and implementation of sanitary and anti-epidemic (preventive) measures;
• R NOSTROY 2.15.3-2011 Internal engineering networks of buildings and structures. Recommendations for testing and adjustment of ventilation and air conditioning systems;
• Input parameter for indoor climate to the design and assessment of energy performance of buildings - indoor air quality, temperature, light and acoustics (DIN EN 15251-2012 Indoor environmental input parameters for design and assessment of energy performance of buildings addressing indoor air quality, thermal environment, lighting and acoustics);
• Ventilation of non-residential buildings - General principles and requirements for ventilation and air conditioning systems and cool room systems (DIN EN 13779-2007 Ventilation for non-residential buildings - Performance requirements for ventilation and room-conditioning systems; German version EN 13779-2007:2007) and other.

Checking the effectiveness of ventilation is a set of measures, measurements (laboratory, instrumental) and observations carried out by qualified specialists. They determine the speed of air movement in the elements of the system and calculate key parameters (for example, multiplicity).

The list of studies includes:

• assessment natural ventilation- channels, technical openings, vents, and so on;
• inspection of mechanical installations and equipment - it is necessary to evaluate the performance of supply and exhaust systems, their aerodynamics, and conduct laboratory tests.

The set of verification procedures when analyzing the effectiveness of ventilation systems includes the following actions and measurements:

• checking flexible elements for damage, tightness of housings, casings and air ducts, fan balance, integrity and quantity of belts and drives;
• measurement of air flow speed, CO2 content, calculation of multiplicity, determination of all microclimate parameters, sampling in work time, at several points;
• carrying out aerodynamic tests according to GOST methods - using pneumometric holes;
• entering test results into summary tables, processing, drawing up inspection protocols, reports and conclusions.

The priority measure to ensure favorable meteorological conditions indoors is efficient system ventilation. Assessing the effectiveness of an existing ventilation system comes down to comparing the air exchange it creates with the standard air exchange. Air exchange in a room is determined by the multiplicity (K, h -1) - a value showing how many times within an hour the air is completely replaced by clean air. Ventilation is considered effective if the frequency of effective ventilation (K d) is greater than or equal to the standard (K n).

The value of the standard multiplicity is determined by calculation, taking into account the specifics of the technological process and type harmful factors, worsening indoor air quality (gases, vapors, aerosols of toxic substances, excess heat or moisture, etc.). The standard air exchange rate is determined by the formula:

Kn = L beat /V St, (2.10)

where L beat is the volume of air to be removed from the room within an hour according to sanitary and hygienic requirements, m 3 / h;

V St – free volume of the room equal to 80% of the geometric volume -

Vst = 0.8Vg g, m 3.

When gases, vapors or dust enter the room air from equipment, the volume of air removed is determined by the formula:

L beat = G in /(C 1 - C 2), (2.11)

where G in is the amount of harmful substances (gases, vapors or dust) entering the room air within an hour, mg/h. This amount can be found using the formulas given in the literature.

C 1; C 2 - concentrations of harmful substances in the exhaust and supply air, respectively, mg/m 3.

When determining the standard air exchange, C 1 = MAC rz, C 2 = 0.3 MAC rz.

When several types of harmful substances of unidirectional action enter the air (summation effect), the volume of air required to remove each substance is found and they are added together. For substances that do not have a unidirectional effect, the maximum of the calculated volumes is taken as the normative one.

When water vapor enters the room air, the volume of air to be removed is calculated using the formula:

L beat = G water /(d 1 - d 2), (2.12)

where G water is the amount of water vapor entering the room air from the process equipment within an hour, g/h;

d 1, d 2 - water vapor content (absolute air humidity) in the exhaust and supply air, respectively, g/m3.

Absolute air humidity (A, g/m3) in numerical value differs little from the partial pressure of water vapor under the same conditions, measured in millimeters mercury(P, mmHg). Therefore, to determine the moisture content in the air, you need to find the partial pressure from the air temperature saturated vapors(see appendix, table 2.7) and multiply this value by the relative air humidity in fractions of unity.

When excess heat (Q kJ/h) enters the room from heated equipment and products, the standard volume of air for their removal is calculated using the formula:

L beat =Q/ [с×r ср ×(t 1 - t 2)], (2.13)

where c is the heat capacity of air, c = 1.2 kJ/(kg × deg);

r cf - air density at average air temperature (t cf), kg/m 3 ;

t 1, t 2 - temperature of the removed and supply air, about S.

t av =(t rz +t 1)/2, (2.14)

where tрз is the air temperature in the work area, the value of which is taken to be the upper value of the permissible temperature for work of a given severity category for the warm period of the year (see appendix, table 2.3).

t 1 =t рз +Dt n ×(H-2), (2.15)

where Dt n - temperature gradient, taking into account the increase in temperature along the height of the room, Dt n = 0.5-1.5 o C/m;

H - room height, m.

Air density (r t) at a temperature (t) more than 0 o C can be calculated using the formula:

r t =1.29×. (2.16)

If there is no technological equipment in the room that is a source of toxic substances, dust, heat or moisture, but there can be many people at the same time, then the required air exchange (Lsp) is found using the formula:

L beat = L n × N, (2.17)

where L n is the specific volume of air per person according to sanitary requirements, m 3 / person×h: if available natural ventilation for industrial premises - 30, public and administrative - 40; without natural ventilation for industrial, public and administrative buildings – 60.

N is the maximum number of people that can be present at the same time this room, people

Determination of the effectiveness of natural ventilation - aeration

Removal of excess heat from process equipment (Q) in “hot” rooms is carried out, most often, through an organized system of natural ventilation and aeration. To carry out aeration, special structures are placed on the roof of the building - aeration lanterns or deflectors, through which heated air is removed from the room due to thermal and wind pressure.

Assessing the efficiency of aeration is carried out by comparing the actual area of ​​the exhaust openings in the aeration lantern (S r) or the diameter of the deflector (D r) with their standard values ​​(S n, D n).

The standard area of ​​the aeration lantern in m2 is found by the formula:

S n =L beat /(3600×r×w), (2.18)

where L beat is the volume of air that must be removed through the aeration lantern within an hour according to sanitary standards, m 3 / h (see formula 2.13);

r is a coefficient that takes into account the active area of ​​aeration lamps and takes values ​​from 0.16 to 0.65;

w – average speed of air movement in the plane of the aeration lantern, m/s.

w=(2H y ×g/r) 1/2 , (2.19)

where Hу is the pressure in the upper part of the room, ensuring the removal of air through the aeration lantern, kgf/m2;

g – gravity acceleration, m/s 2 ;

r is the density at the temperature of the removed air, kg/m3.

With zero air balance (inflow equals exhaust):

H y =H t/2; and H t =h (r p - r y), (2.20)

where N t is the thermal pressure ensuring the supply and removal of air using the aeration system, kgf/m 2 ;

h – distance from the middle of the supply openings to the middle of the exhaust openings, m. For approximate calculations, h can be taken equal to 1-2 m less than the height of the building;

r p; r y - density of supply and exhaust air, respectively, kg/m3.

Air density, taking into account the temperature of the supply and exhaust air, is calculated using formula 2.16.

In small industrial buildings They use channel aeration, in which low-quality air is removed through ventilation ducts provided in the walls of the room. To enhance the exhaust from the ducts, deflectors are installed on the roof of the building - devices that create draft both due to thermal pressure and due to the wind blowing them. The performance of the deflector is proportional to its diameter (D, m) and can be found by the formula:

D = 0.0188(L y /w p) 1/2, (2.21)

where L y is the standard volume of air that must be removed using this deflector, m 3 / h;

w p – air speed in the deflector pipe, m/s. This speed is taken equal to 20 - 40% of the average wind speed for the area where the room is located. For the Ivanovo region, the average wind speed is 3.5 m/s.

The Radek company offers comprehensive services for facilities of any complexity in Moscow and Moscow Region. We have a staff of experienced employees, as well as everything necessary measuring equipment to check the effectiveness of this utility network accurately, thoroughly and in a short time. As a result of the inspection, it is determined whether the ventilation system complies with current sanitary, fire and other standards, whether the necessary air exchange and other parameters subject to control are observed.

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When do ventilation systems require inspection?

Measurements of key parameters of the functioning of ventilation systems are necessary in the following cases:

• During commissioning and commissioning. Immediately after the ventilation has been installed, it is necessary to configure, test and start it up. In addition, new systems undergo certification, an integral element of which is a thorough check of operating parameters.
• During reconstruction. Reconstruction can be understood as complete replacement Total ventilation equipment at the facility, as well as a significant change in the structure (for example, commissioning new system air conditioning, due to which the performance indicators of the entire ventilation network have significantly changed). After the work is completed, measurements are taken to confirm that the new system meets the standards.
• During regular periodic monitoring of equipment performance. In accordance with current regulations, ventilation systems at various facilities must be inspected at specified intervals. General principle: the more dangerous the technological processes and the stronger the safety is related to the efficiency of the ventilation equipment, the more often inspections are needed. Thus, in residential buildings such an inspection can be carried out once every 3 years, while most industrial facilities undergo the procedure annually. For those premises where the technology uses toxic or radioactive substances, even monthly inspection may be required.

What parameters are assessed during testing of ventilation systems?

The specific checklist of inspections that will be carried out at the facility depends on the purpose of this facility, technological processes, as well as the composition of the ventilation system. The most typical set includes the following parameters:

• . This is a conditional indicator that characterizes the number of complete changes of air in a room per unit of time (usually per hour). The higher the concentration of harmful substances in the air, the higher the multiplicity requirements.
• Air pressure in ventilation ducts and air ducts (air movement speed). This indicator allows you to check the correct functioning of ventilation equipment, including active ventilation units - from a simple in-duct fan to a high-performance chiller.
• Volume flow air. At facilities where exhaust ventilation operates, systems of diffusers and air distributors are used, it is necessary to estimate how much air goes into the ventilation grille or an exhaust hood per unit of time.
• Separate indicators of indoor microclimate. It should be understood that testing ventilation systems and checking the microclimate is different kinds research. However, some parameters need to be determined in order to assess the efficiency of the equipment. For example, the ventilation system is characterized by such an indicator as the speed of air flow in the room.

Based on the measurements taken, a conclusion is made about the work engineering systems: to what extent the actual indicators correspond to sanitary standards, and whether the ventilation system at the facility can be considered sufficient.

How is the work done?

To check the operation of the equipment, Radek engineers arrive at the site, bringing with them all the necessary equipment. An electronic balometer used to measure air flow, a hot-wire anemometer used to check air flow rate and temperature, and other equipment may be used to evaluate efficiency. Electronic devices are used to evaluate the parameters of the air flow in the ventilation ducts and other devices. The work is carried out according to the following algorithm:

• Preliminary study of technical documentation for the ventilation system. If we are talking about new equipment, preliminary calculations are based on design documentation; if ventilation is existing, the information recorded in the ventilation systems passport is taken into account.
• Radek specialists gain access directly to the ventilation system. During field research, all performance indicators are assessed. The parameters obtained during inspections are recorded in protocols. If necessary, ventilation ducts are examined. All work on the ventilation system is non-destructive and safe for the equipment.
• Calculation of design values. After the field stage, a desk stage is carried out, during which engineers calculate the ventilation characteristics and compare them with the standard values ​​specified in the design documentation or passport. Conclusions are drawn about the operation of the equipment and compliance with established standards.
• Registration of the act. Based on the results of the work carried out, a detailed report is drawn up according to the established methodology, which contains all the identified indicators, after which a conclusion is drawn. If no problems are found, a conclusion is drawn that all ventilation elements are functioning correctly, and the ventilation system can be used safely and in accordance with standards. If problems are identified, a list of works will be recommended aimed at eliminating the identified problems.

Depending on the characteristics of the technological processes, ventilation testing can be carried out either comprehensively (across the entire facility) or only in some rooms.

Air conditioning and ventilation: is there a difference from an inspection point of view?

In modern conditions ventilation duct can perform the functions of delivering conditioned air to rooms. It is increasingly being implemented at facilities central air conditioning, which works inextricably with ventilation.

Therefore, if the facility has implemented similar solution, the assessment work must be carried out comprehensively, assessing all work parameters. The procedure for assessing the efficiency of the system in the presence of air conditioning units is somewhat different, since attention is paid not only to air movement indicators, but also to microclimatic characteristics (temperature, air humidity, etc.)

Radek company: your confidence in the correct operation of systems

Our company combines three key advantages: staff with impressive experience, availability of everything necessary equipment and strict adherence to regulations. As a result, by contacting us, you will receive:

• A competent solution in a short time so that you can use the system uninterruptedly. The act drawn up by our specialists will become reliable protection from any claims from regulatory authorities.
• Minimum hassle. Our experts know how to work carefully and discreetly, so inspections even at functioning enterprises are carried out without significant complications for the business.
• Care and accuracy of all measurements. We will check each ventilation duct and grille outlet to make sure there are no problems with the systems. Therefore, our audit is not just a formality necessary to check the protocol, but an opportunity to identify real problems.
• Impeccable design documentation. Our reports and acts are easily recognized by government agencies and services, guaranteeing legal protection for our clients.

To get advice and find out more about ordering this service, call us right now!

Monitoring the efficiency of ventilation systems (production control of ventilation systems) heating, ventilation, air conditioning systems, smoke protection. The efficiency of ventilation systems is monitored to determine pressure loss and air flow in ventilation systems. Such control means their testing in order to improve the efficiency of ventilation systems and to evaluate the performance of the enterprise maintenance service.
Further activities following the efficiency check are drawing up a ventilation system passport and calculating the air exchange rate at the facility, comparing the values ​​obtained during control with the design ones. All test results are recorded in a protocol, reflecting the identified deficiencies and recommendations for their elimination. The protocol is attached to the ventilation system passport.

Frequency of monitoring the efficiency of ventilation systems (industrial ventilation control) in accordance with clause 5.1. VNE 11-88:
- periodic tests existing systems ventilation serving industrial premises of categories A and B is recommended to be carried out at least once a year;
- periodic testing of existing ventilation systems serving production premises of categories B, D and D is recommended to be carried out at least once every 2 years;

Frequency of monitoring the efficiency of ventilation systems (industrial ventilation control) in accordance with clause 1.7. MU 4425-87:
- once a month – for premises with the possible release of hazardous substances of class 1-2;
- once a year – for premises equipped with local supply and exhaust ventilation;
- once every three years – for premises equipped with general mechanical and natural ventilation.

Checking the effectiveness of ventilation is a set of laboratory and instrumental measurements carried out by an accredited laboratory. In particular, the speed of air movement in air ducts and ventilation ducts is measured, and the air exchange rate is calculated.

This complex may include:
Checking natural ventilation. Initial inspection of the ventilation system ducts when putting the facility into operation. Based on the results of the inspection, an initial inspection report is drawn up.
Checking artificial ventilation. All elements of the supply (exhaust and mixed) ventilation system are examined for operability. Based on the results of the inspection, a protocol for laboratory measurements of the aerodynamics of the system is prepared. The customer is issued a ventilation system passport and a document (conclusion) confirming compliance or non-compliance with the design parameters.

Carrying out work on certification of the ventilation system.

Certification of a ventilation system is a check of the condition of all elements of the ventilation system when it is put into operation, during which all necessary aerodynamic tests and measurements are carried out. The test results are recorded by specialists in the passport of the ventilation system of the object being tested. When carrying out certification of ventilation systems, an expert assessment of the parameters of the air environment is also carried out: temperature, humidity, analysis of the composition of air masses and the degree of their mobility.

The ventilation system passport is important technical document, giving the legal right to put a specific unit of ventilation equipment into operation, and confirming the implementation full cycle works (design, installation, commissioning) in accordance with the current regulatory and technical documentation.
This document includes the following information:
- name of the certified organization carrying out this type works;
- name and address of the object;
- name and purpose of the system, its location;
- basic specifications equipment;
- table of projected and actual air flow rates, indicating the percentage of deviations;
- axonometric diagram of the system, indicating the points of measurements taken;
- conclusion and signatures of representatives of the design and commissioning organization.

The ventilation system passport is necessary for the customer to register the purchased equipment and its regular use in order to achieve the necessary sanitary and hygienic air parameters.

_________________________________________________________________________________________________________________
VNE 11-88 "Instructions for safe operation ventilation systems at the enterprises of the ministry chemical industry THE USSR"
MU 4425-87 "Sanitary and hygienic control of ventilation systems for industrial premises"
SP 60.13330.2012 "Heating, ventilation and air conditioning. Updated edition of SNiP 41-01-2003"
R NOSTROY 2.15.3-2011 "Recommendations for testing and adjustment of ventilation and air conditioning systems"

Shows how quickly exhaust air is removed from the room and is determined by the percentage ratio of the concentration of harmful impurities in the exhaust air to the concentration of harmful impurities in the room .

Efficiency determines the quality of air exchange and shows how capable the ventilation system is of providing comfortable conditions in terms of clean air. This air exchange rate directly depends on the geometry of the room, relative position supply and exhaust channels, density and distribution of sources of harmful impurities, etc.

Another parameter that determines quality is the air exchange coefficient.

The air exchange coefficient is a percentage indicator of the rate of air replacement in a room, which can be determined by the formula:

This parameter depends on the conditions of air distribution in the room, the location and geometric parameters of diffusers, the location of heat sources, etc. Today, there are two types of indoor air exchange - ventilation by mixing and displacement.

8. Supply and exhaust ventilation system. Scope of application of ventilation systems with positive and negative air balance Scope of application of recirculation systems;

Supply and exhaust general ventilation

It is used in rooms where it is necessary to ensure increased and reliable air exchange. With this type of mechanical ventilation in industrial premises where a significant amount of harmful gases, vapors, dust is released, the exhaust must be 10% more than the inflow so that harmful substances are not displaced into adjacent rooms with less harm.

In system supply and exhaust ventilation it is possible to use not only outdoor air, but also indoor air after it has been purified. This reuse of indoor air is called recirculation and is carried out during the cold season to save heat spent on heating the supply air. However, the possibility of recirculation is determined by a number of sanitary, hygienic and anti-fire requirements

Supply system Mechanically assisted ventilation can be performed with recycling. Recirculation is the mixing of exhaust air with supply air. Recirculation can be complete or partial. Partial recirculation is used in conventional ventilation systems during working hours, since an influx of outside air is required into the room. The minimum amount of outside air should not be less than sanitary standards. The use of recirculation allows you to save heat consumption in winter.

9. Local ventilation systems. Purpose and scope;

Local ventilation- this is an air exchange system in a limited part of the space, the microclimate of which differs from its general atmosphere. That is, in fact, this type of ventilation is intended for installation in a separately considered workplace

In rooms with local emissions of harmful substances, the use of local ventilation makes it possible to reduce the amount of supplied and exhausted air several times

Types of local ventilation

To create a ventilation system in the workplace, one of two types is formed - exhaust or supply local ventilation.

Local exhaust ventilation used for localized sources of harmful substances, when it is possible to prevent their spread throughout the entire production area. It consists of capturing and removing harmful emissions released into the indoor air. With its help, the emission of dust, smoke, and gases is organized.

Supply local ventilation designed for intensive delivery directly to the workplace fresh air, cooling it if necessary, as well as blowing cooled air currents if significant thermal radiation occurs. Application of local ventilation

Local ventilation in many cases is justified, and often simply objectively necessary. It is used in almost any industrial sector, including mines, chemical, and metallurgical industries.

Depending on the type of source of hazards (machine, bathtub, etc.), various local suctions, exhaust hoods, exhaust panels, etc. are used. Onboard suctions, for example, are conveniently located around the perimeter of the bathtubs.

Benefits of local ventilation

These include, first of all, environmental necessity associated with maximum effective protection health of workers in hazardous production. With its help, they prevent the occurrence and development of pulmonary and cancer diseases, allergies, irritation of the eye mucosa, and headaches.

The second significant advantage is economic efficiency its application. It consists of saving energy costs (up to 60%), as well as increasing the productivity of working personnel (according to statistics - up to 20%). In addition, local ventilation contributes to additional heating of the air in the production room, which creates another savings item.