Manufacturing of connecting parts for ventilation systems. Ventilation system details

The technology for the production sequence of air ducts can be represented as follows: metal straightening, marking, cutting, bending, assembly and priming.

Cutting of shaped thin sheets using a copier or by marking (using STD-11012 mechanisms for shaped cutting of ventilation product blanks and VMS-106 die-cutting mechanism). Direct cutting of thin-sheet rolled and sheet products is carried out on automatic lines: STD-13008 and STD-13024 for longitudinal-transverse cutting of rolled steel. Flexible parts from thin-sheet rolled cylindrical and conical products are produced using STD-518, STD-14 mechanisms for rolling (three-wave and four-wave). Bending of rectangular parts is carried out on sheet bending mechanisms LS-4, LS-5, STD-19. bending of long products (flanges) is carried out using STD-42, STD-747 for round, STD-45 for rectangular flanges.

Automated production of straight sections of air ducts from rolled steel of round section is carried out on the STD-850 automatic line for the production of spiral-seam air ducts, on the STD-450A automatic line for the production of spiral welding air ducts - welding in a CO 2 environment, STD-450B - plasma welding. For the manufacture of air ducts from sheet steel, the following mechanisms are assumed: an automatic line for the production of frames, semi-automatic machines for the production of air ducts of round and rectangular cross-sections. Straight sections of air ducts can be made from paintings, without allowing more than two connections of lying folds. In the manufacture of air ducts from sheet metal, various seam and welded joints are used. The assembly of steel air ducts with a metal thickness of up to 1.5 mm is carried out mainly using seams, and for larger thicknesses - by welding. In the absence of special instructions in the installation project, the longitudinal seams of air ducts made of sheets up to 1.5 mm thick are overlap welded, and when the metal thickness is over 1.5 mm, butt welded or overlap welded. All longitudinal seams of air ducts must be secured at the ends of the flanges by spot welding or rivets.

Air ducts are painted in two ways:

Painting of sheet steel with subsequent production of products;

Coloring of finished products in volumetric design.

The main methods of painting air ducts are: painting in an electrostatic field, jet spraying, with exposure to solvent vapor, dipping sheets and small-sized products into a bath of paint and varnish material, manual painting with an airless solvent in an electrostatic field.

4.Measures on safety precautions and fire-fighting equipment during procurement and installation work.

Workers who have been trained in safe labor methods, tested their knowledge of rules, regulations and instructions on labor protection and have a certificate of the established form are allowed to carry out work. The worker can begin performing work after he has been instructed directly at the workplace.

Work with electrified tools is permitted to a worker who has the 1st qualification group in electrical safety and has been instructed at the workplace.

Mechanisms, equipment and tools must correspond to the nature of the work performed, be in good condition, and their rotating parts must have guards. If there is work to be done during which fragments, sparks or splashes may fly, it is necessary to prepare safety glasses with transparent, unbreakable lenses. In the working area, units and auxiliary mechanisms should be placed so that a safe and free passage with a width of at least 0.8 m is provided to them.

To avoid electric shock, do not touch exposed live parts of electrical equipment, exposed wires, and do not make independent corrections or connections to electrical wiring.

The place where fire hazardous work is carried out must be equipped with fire extinguishing means. Upon completion of work, carefully check the work area and do not leave open flames or objects heated to a high temperature.

If situations arise that could lead to breakdowns and accidents, you must immediately stop work, turn off the power supply, remove explosive and flammable materials and report the situation to the foreman.

When performing pipe procurement work on pipe cutting, pipe threading and pipe bending machines, the following labor safety rules must be observed:

All workers must be trained in labor safety rules on machines and have permission to do so. In the case of installing a new brand of machine, the worker first undergoes instruction and only after mastering the work on the machine is allowed to work independently;

All rotating parts of the machine must be protected;

Electrical wires to the motor must have intact insulation and must be closed in boxes;

The switch should be protected by a box closed with a lock;

Before starting electric welding, it is necessary to check the serviceability of the insulation of wires and electric motors, the presence and serviceability of grounding of the structures being welded and the transformer casing, as well as the absence of voltage on the device body.

The welder must have an individual helmet and shield.

Smoking is prohibited when gas welding and cutting. Gas cylinders must be protected from sunlight and placed on special stands away from electrical wires, heated objects and passages. Hoses connecting the generator or cylinders to the burners must be gas-tight. It is prohibited to use gearboxes without pressure gauges or with faulty pressure gauges whose inspection period has expired.

When carrying out tinsmithing work on lever and vibrating shears, manual and driven rolling and zigmachines, on bending folding machines, the following pipe protection rules must be observed:

When working with lever scissors, you should use safety rulers, and the counterweight should be firmly attached to the lever, positioning it so that spontaneous lowering of the knife is prevented;

When working on manual and driven rolling and zigging machines, you need to ensure that when feeding material, the distance between the hands and the rotating rolls and rollers is at least 200 mm. It is prohibited to correct the sheet being processed on the go, as well as to attach templates to it and take measurements;

When working on bending machines, you must not lean on the gear sector of the machine. It is prohibited to bend sheet metal whose thickness is greater than that permitted by the machine’s passport;

When working on a folding machine, it is prohibited to grasp the rolled workpiece with your hands at a distance of less than 200 mm from the profiling rollers.

When using pipe wrenches and wrenches, do not put pieces of pipe on the handles of the wrenches and do not use metal pads under the jaws of the wrenches. When filling systems with coolant and draining it, during testing and adjustment, it is necessary to use portable lamps with a voltage not exceeding 12 V.

When working from scaffolds or at openings located above the ground or ceiling at a height of 1 m or more, workplaces must have a fence. It should consist of racks, a handrail located at a height of 1 m from the working floor, and a side board with a height of at least 150 mm, which prevents any object from falling onto the worker below.

When working simultaneously in two or more tiers, it is necessary to install nets, canopies or other protective devices. To carry and store dowels, bolts, nuts and other small parts, those working at height must have an individual bag. If work at a height of more than 1.5 m is impossible or impractical to perform from a platform or fenced scaffolding, workers must use safety belts.

Installation openings in walls and ceilings left for pulling in equipment should be covered with solid flooring or movable fences after their use, and after completion of installation work, these openings should be sealed. When lifting equipment, especially into installation openings, installation areas where the load may fall during its movement and installation in the design position should be fenced off by posting warning signs prohibiting the presence of unauthorized persons in the specified area.

All installers must wear safety helmets. When starting up ventilation units, you should stay away from fans and temporary gears. It is prohibited to turn on the electric motors of ventilation equipment and connect the devices to the electrical network.

During the period of inspection of the wheels of fans, hoppers, cyclones, scrubbers and when working inside air ducts and ventilation chambers, the electrician on duty must completely de-energize the system and hang up a sign “Do not turn on people working.”

If shocks, suspicious noise, overheating of electric motors, vibration of equipment or a power outage are detected, you must report this to the electrician on duty or the electrician on duty.

Work related to the startup and regulation of ventilation and air conditioning systems is permitted to be carried out with working equipment.

The set of devices and mechanisms in the ventilation network includes not only lines and fittings, but also a number of other elements that perform various functions. Ventilation operation must be efficient, safe and comfortable. To do this, in particular, it is necessary to ensure:

• Regulation of air flow in the network;
• Control of the direction of flow;
• Sound insulation and vibration insulation.

These and other problems are solved by special parts of ventilation systems, which are installed during the installation of the entire system. Each product is assigned a specific place, provided for in advance by the project.

This section presents deflectors, umbrellas, flexible inserts, dampers, and valves of various types. The difference between shaped products and these parts is that the former are designed to create an extensive network of channels, connecting sections to each other different directions and sections.

When ordering product items in the catalog, you should carefully indicate the required dimensions and parameters of the products, since incorrect selection of equipment may lead to malfunctions and malfunctions of ventilation in the future.

Throttle valves

A throttle valve is a special device that regulates air flow and the volume of air masses passing through the ventilation network. Structurally, the throttle valve is a steel body with an adjustable damper located inside and a handle that controls it. By turning, the damper can block the air flow or, depending on its position, reduce its speed and quantity.

Throttle valves are installed in places where ventilation lines branch. The connection to the air ducts is carried out using a nipple or flange method, and it is important to maintain complete tightness.

The position of the damper can be controlled either manually or using an electric drive. The last option is especially relevant when the throttle valve is located in a hard-to-reach place. In addition, if the ventilation network control is automated, the valve can also be part of this system.

Silencers

These devices are used to suppress noise in air ventilation lines. They can be installed at the end of the duct; between the air duct and the fan; in front of the air distribution device. In some cases, to increase efficiency, silencers are installed on both sides of the sound source.

Silencers may have different characteristics and differ structurally depending on the type of air duct section in which they are mounted:

Sound suppressors for round air ducts are a rectangular box with plates with sound-absorbing material placed inside. The distance between the plates may vary. The smaller the cell size, the lower the sound level, however, the air pressure loss increases.

Silencers for rectangular air ducts consist of two round or rectangular pipes threaded into each other. Sound-absorbing material is placed between them.

Flexible inserts

Flexible inserts help reduce the vibration impact transmitted from the operating fan to the air duct. This allows the vibration experienced by the duct network to be significantly absorbed. Also decreasing general level noise.

Flexible inserts have become widespread in various types of ventilation systems. Most often they are used in industrial production, where ventilation involves particularly powerful fans, as well as air ducts with a large cross-sectional diameter. With equipment of this size, vibration and noise can be very high and must be reduced.

Structurally, the inserts consist of flanges made of galvanized steel, between which there is a durable section of textile material. The type of such material may depend on the temperature conditions during ventilation operation. Such products are usually mounted at the fan outlet or on the suction pipe. Fastening is carried out using a flange method or clamps. For tightness, an additional layer of sealant is applied.

The dimensions of flexible inserts must correspond to the standard sizes of fans and air ducts. Inserts can be round or rectangular, depending on the type of cross-section of the ventilation equipment.

Umbrellas

Protective umbrellas are installed at the ends of the outer sections of air ducts. By covering the outlet, they prevent precipitation from entering the ventilation network.

Rain or snow particles should not flow into the ducts, since excess moisture is undesirable for steel. Despite the fact that the material from which air ducts and fittings are made is galvanized to protect against corrosion and rust, excess moisture should still be avoided.

Similar to air ducts, umbrellas can also be round or rectangular. They are mounted with air ducts using a nipple connection. The standard size of the umbrellas is determined by the cross-sectional size at the junction - the parameters of the joined air duct and the umbrella must be proportionate. The visor of the product can have different dimensions. It is possible to produce both standard and non-standard umbrellas.

Deflectors

For some reason, ventilation ducts may experience reduced draft. The reason may be various factors, for example, weather conditions, precipitation, wind, location of the outlet pipe and others. To solve this problem, specialists install a special device - a deflector. It allows you to increase draft in the ventilation ducts, thereby increasing the efficiency of the system.

Typically the deflector is mounted at the end of the exhaust duct. The principle of operation is that due to the design of the device, air flows created by the wind are deflected and an area of ​​​​low pressure is created. A vacuum is formed in the area where the deflector is placed, causing the air flow to rise upward. This allows you to significantly increase draft in the ventilation channels.

Mechanic for the manufacture of parts and components of ventilation, air conditioning, pneumatic transport and aspiration systems

§ 349. Mechanic for the manufacture of parts and components of ventilation, air conditioning, pneumatic transport and aspiration systems, 2nd category

Characteristics of work. Straight and curved cutting of sheet metal, polymer material according to finished markings manually. Bend straight folds manually. Coating of folds with drying oil. Assembling folds in pairs. Punching holes in sheet metal. Marking of components using branding and paint. Installation of gaskets. Moving cargo.

Must know: name and main properties of materials used in the manufacture of ventilation systems; techniques for straight and curved cutting of sheet metal, plastic, polymer material according to finished markings manually; rules for slinging and moving cargo; methods of connecting units and parts.

§ 350. Mechanic for the manufacture of parts and components of ventilation, air conditioning, pneumatic transport and aspiration systems, 3rd category

Characteristics of work. Installation of “windows” in prepared paintings. Beading the ends of round air duct elements using a zig machine. Drilling holes on drive machines. Manufacturing of gaskets for flange connections. Production of rigid frames from metal. Manufacturing of rectangular flanges. Welding vinyl plastic and polyethylene sheets in vertical and horizontal positions. Installation of mesh and movable louvres. Punching holes in flanges. Straight-line cutting of sheet metal, metal-plastic and vinyl plastic on machines. Rolling and upsetting of seam joints on drive machines.

Must know: basic properties and methods of processing sheet and profile metal, plastic, vinyl plastic and polyethylene; types of fastening of air ducts and fittings; name and purpose of parts of ventilation, air conditioning, pneumatic transport, aspiration systems; markings; methods for processing workpieces on edge bending machines, zig machines and folding machines; methods of welding vinyl plastic and polyethylene; design and operating rules of machines and mechanisms for processing sheet and profile metals and metal-plastics, spot machines for resistance welding; rules for using power tools.

§ 351. Mechanic for the manufacture of parts and components of ventilation, air conditioning, pneumatic transport and aspiration systems of the 4th category

Characteristics of work. Curvilinear cutting of sheet metal, plastic, polyethylene and vinyl plastic on driven machines. Rolling of cylindrical parts made of sheet metal, plastic, polyethylene and vinyl plastic on rollers. Manufacturing of straight sections of air ducts from metal, metal-plastic, vinyl plastic and polyethylene, bandages, slats, sliders, reflectors, exhaust hoods, throttle valves and noise suppressors of various types. Manufacturing of fixed louver grilles, round flanges and trunnions, spiral-welded and spiral-locked air ducts. Installation of flanges on air ducts and fittings. Completion of ventilation, air conditioning, pneumatic transport and aspiration systems. Manufacturing of brackets, plank supports and traverses for fastening air ducts. Welding of products made of vinyl plastic and polyethylene.

Must know: methods of marking and cutting parts made of metal, metal-plastic and vinyl plastic; types of connections and fastenings of air ducts and fittings; rules for performing detailed sketches; techniques for performing rivet work; technology for manufacturing straight sections of air ducts from metal, metal-plastic, vinyl plastic and polyethylene.

§ 352. Mechanic for the manufacture of parts and components of ventilation, air conditioning, pneumatic transport and aspiration systems, 5th category

Characteristics of work. Production of shaped parts of air ducts of all types, dampers, funnels, casings, umbrellas, deflectors and diffusers. Manufacturing of movable louver grilles, throttle valve control sectors, cyclones. Cutting bend links using copy templates and assembling them on a zig machine. Manufacturing of soft joints.

Must know: technology for manufacturing shaped parts of air ducts from sheet metal, metal-plastic, vinyl plastic and polyethylene; design and principle of operation of ventilation, air conditioning, pneumatic transport and aspiration systems; the range of manufactured equipment and the requirements for its quality.

§ 353. Mechanic for the manufacture of parts and components of ventilation, air conditioning, pneumatic transport and aspiration systems, 6th category

Characteristics of work. Marking and production of non-standard pyramidal and conical air ducts and fittings. Manufacturing of separators, scrubbers, supply and exhaust cabinets, asymmetrical transitions. Manufacturing of shower pipes, air curtains. Marking and production of templates of all types. Control assembly of manufactured systems various types.

Must know: methods for marking and manufacturing non-standard pyramidal and conical air ducts and fittings; methods for control assembly of components of ventilation, air conditioning, pneumatic transport and aspiration systems.

Secondary vocational education required.

Modern building - enterprise, industrial facility, a private house– it is impossible to imagine without an air exchange complex. Ventilation is a key component of any building engineering communications. Without timely supply, processing and removal of air flows, it is extremely difficult to maintain an optimal climate for technical personnel and conditions for correct work production equipment. Cutting the shaped parts of industrial ventilation is an extremely important stage in the installation of an air exchange complex. A number of activities for the production of components ventilation pipes requires exclusively vocational training and implementation.

Industrial air exchange system

Brief information about ventilation

The purpose of any air exchange is the uninterrupted supply and processing of air flows with their subsequent removal outside the premises. The natural ventilation method is hardly suitable for an industrial facility.

Most often, ventilation is associated with filtration cleaning, as well as cooling/heating of the air mass.

Industrial ventilation is a forced process that is only possible thanks to specialized climate control equipment.

There are three types of forced ventilation:

1. Supply;
2. Exhaust;
3. Combined (supply and exhaust ventilation).

Ventilation of an industrial facility

It is the combined air exchange scheme that is considered as the most optimal method of organizing air movement in a room. The supply part of such a complex is responsible for access and processing of fresh air flows, and the exhaust component is responsible for their timely and effective removal outside the given area.

The organization of such a complex air exchange system includes a number of important stages, each of which is a guarantee of the successful implementation of the project. One of these important stages is design, during which the most suitable units and equipment for a given room are determined.

Sample project documentation

A modern industrial air exchange system is impossible without:

1. Air ducts;
2. Fans;
3. Heaters (devices for air exchange);
4. Cooling devices;
5. Supply systems responsible for timely access of air;
6. Various filters for purifying air from harmful impurities and gases.

It’s not for nothing that we mentioned air ducts first. If the fan can be defined as the “heart” of any forced air exchange system, then the air ducts are “arteries” through which air moves in a strictly specified direction.

Air duct pipes

Purpose and features of air ducts

A properly designed duct network is the basis of an effective ventilation system. That is why modern air exchange systems require a variety of shapes and characteristics of these products.

It may be mentioned that only metal pipes There are more than 10 different types for moving air. These “arteries” must have high levels of fire resistance, anti-corrosion, resistance to acidic environments, etc. Sheet metal (copper, aluminum, titanium alloys), plastic, fiber cement are all materials from which air ducts are made. There are also round and rectangular sections of such pipes, each of which has its own individual characteristics. Let us also mention flexible, rigid, and semi-rigid air duct pipes. And so on.

Plastic air duct box

In other words, the choice of air duct products depends on the wishes of the customer, the engineering features of the industrial premises, the purpose and installation of the air exchange network.

Air duct manufacturing technology

The production of ventilation ducts and fittings (read – part, element) must ensure the highest quality of joints and joints. This will make it possible to level out possible losses of air circulation in the future and install an air exchange network more efficiently and without significant time costs. The accuracy of the production of pipe components depends on properly adjusted automated control of devices and machines.

Shaped elements of the ventilation system

The qualifications of specialists are also extremely important; how efficiently they will be able to make markings, as well as cutting sheet material (we are considering the most common material - low-carbon steel) for “patterns” of shaped parts of air ducts. Workers must have knowledge of various connections of network elements and parts, the design functionality of automation, as well as the key requirements for both material and equipment specified in SNiP.

Selection of material and methods of work

The practical implementation of cutting begins with the selection of the appropriate material. It is necessary to take into account the factors of saturation, cooling/heating, yoke rigidity, vibration characteristics, as well as a number of other operational nuances.

Example of shaped components layout

The most common method of processing sheet metal for cutting air duct network elements is oxy-fuel cutting. In this way you can implement:

1. Directly cut the steel;
2. Trimming profile metal;
3. Cutting out various gussets, flanges, and other blanks.

Connecting shaped components to each other - welding - also has a number of features:

1. The usual (manual) welding method is butt joints, excluding metal allowances;
2. The seam or spot method involves electric welding automation and allows for material allowances.

Seam welding technology

Shaped elements of the air exchange network should be cut using combined templates. In addition to welding, connecting them together into a single complex is possible in the following ways:

1. Bells;
2. Flanges;
3. Crimping bands.

All these methods of fastening pipe elements are essentially not much different from each other, but they have their own individual characteristics. For example, a socket connection considers a ring that, when heated, is put on the end of the air duct, and after cooling, it is welded to the pipe. The same procedure is carried out in relation to the air duct itself. After this, the rings are fastened together by welding.

Sample engineering calculation tables

In order to prevent clogging, fittings must be made with smooth turns, according to a standard template.

It is necessary to take into account the fact that not all elements of the air duct network are the same in terms of wear resistance. The cutting of some parts that fall into such a “risk zone” must be done so that these components can be replaced in the future without threatening the entire complex.

The most labor-intensive and responsible operation is the marking of tees, transitions, crosses, etc. The cutting of such ventilation segments (up to 900 mm) must be carried out according to the inventory combined templates. Parts whose diameter is over 900 mm should be manufactured based on special engineering tables that provide markings along coordinates.

Manufacturing of air ducts

384. Mechanic for the manufacture of parts and components of ventilation, air conditioning, pneumatic transport and aspiration systems, 2nd category

Characteristics of the work. Performing simple work in the manufacture of parts for ventilation, air conditioning, pneumatic transport and aspiration systems.

Must know: main materials used in the manufacture of ventilation systems. Techniques for straight and curved cutting of sheet metal, plastic, polymer material according to finished markings manually. Rules for slinging and moving cargo. Methods for connecting units and parts

Work examples. Straight and curved cutting of sheet metal, polymer material according to finished markings manually. Bend straight folds manually. Sealing folds. Assembling flanges in pairs. Punching holes in sheet metal. Marking of components using branding methods and paint. Installation of gaskets. Moving cargo.

385. Mechanic for the manufacture of parts and components of ventilation, air conditioning, pneumatic transport and aspiration systems, 3rd category

Characteristics of the work. Performance simple work in the manufacture of parts for ventilation, air conditioning, pneumatic transport and aspiration systems.

Must know: basic properties and methods of processing sheet and profile metal, metal plastic, vinyl plastic and polyethylene. Types of fastening of air ducts and fittings. Details of ventilation, air conditioning, pneumatic transport, aspiration systems and their purpose. Marking symbols. Methods for processing workpieces on edge bending machines, zig machines and folding machines. Methods for welding vinyl plastic and polyethylene. Fundamentals of the design and rules of operation of machines and mechanisms for processing sheet and profile metals and plastic materials, spot machines for resistance welding. Rules for using power tools.

Work examples. Installation of “windows” in prepared paintings. Beading the ends of round air duct elements using a zig machine. Drilling holes on drive machines. Manufacturing of gaskets for flange connections. Production of rigid frames from metal. Manufacturing of rectangular flanges. Welding vinyl plastic and polyethylene sheets in vertical and horizontal positions. Installation of mesh and movable louvres. Punching holes in flanges. Straight-line cutting of sheet metal, metal-plastic and vinyl plastic on machines. Rolling and upsetting of seam joints on drive machines.

386. Mechanic for the manufacture of parts and components of ventilation, air conditioning, pneumatic transport and aspiration systems, 4 categories

Characteristics of the work. Performing work of medium complexity in the manufacture of parts and components of ventilation, air conditioning, pneumatic transport and aspiration systems.

Must know: methods of marking and cutting simple parts made of metal, metal-plastic and vinyl plastic. Types of connections and fastenings of air ducts and fittings. Detail sketches. Techniques for performing rivet work. Technology for manufacturing straight sections of air ducts from metal, metal-plastic, vinyl plastic and polyethylene.

Work examples. Curvilinear cutting of sheet metal, plastic, polyethylene and vinyl plastic on driven machines. Rolling of cylindrical parts made of sheet metal, plastic, polyethylene and vinyl plastic on rollers. Manufacturing of straight sections of air ducts from metal, metal-plastic, vinyl plastic and polyethylene, bandages, slats, sliders, reflectors, exhaust hoods, throttle valves and noise suppressors of all types. Manufacturing of fixed louver grilles. Manufacturing of round flanges and trunnions. Manufacturing of spiral-welded and spiral-lock air ducts. Installation of flanges on air ducts and fittings. Completion of ventilation, air conditioning, pneumatic transport and aspiration systems. Manufacturing of brackets, plank supports and traverses for fastening air ducts. Welding of medium complexity products made of vinyl plastic and polyethylene.

387. Mechanic for the manufacture of parts and components of ventilation, air conditioning, pneumatic transport and aspiration systems, 5th category

Characteristics of the work. Performing complex work in the manufacture of parts and components of ventilation, air conditioning, pneumatic transport and aspiration systems.

Must know: technology for manufacturing shaped parts of air ducts from sheet metal, metal-plastic, vinyl plastic and polyethylene. The design and principle of operation of ventilation, air conditioning, pneumatic transport, aspiration systems and the range of equipment. Requirements for the quality of elements of systems of all types.

Work examples. Production of shaped parts of air ducts of all types, dampers, funnels, casings, umbrellas, deflectors and diffusers. Manufacturing of movable louver grilles. Manufacturing of throttle valve control sectors. Manufacturing of cyclones. Cutting bend links using copy templates and assembling them on a zig machine. Manufacturing of soft joints.

388. Mechanic for the manufacture of parts and components of ventilation, air conditioning, pneumatic transport and aspiration systems, 6th category

Characteristics of the work. Performing particularly complex work in the manufacture of parts and components of ventilation, air conditioning and aspiration systems.

Must know: methods for marking and manufacturing pyramidal and conical air ducts and fittings. Methods for control assembly of components of ventilation, air conditioning, pneumatic transport and aspiration systems.

Work examples. Marking and production of particularly complex, non-standard air ducts and fittings. Manufacturing of separators, scrubbers, supply and exhaust cabinets, asymmetrical transitions. Manufacturing of shower pipes, air curtains. Marking and production of templates of all types. Test assembly of all types of systems.