| Air handling installations; |
| Central heating, ventilation, air conditioning (HVAC) installations; |
| Gas supply and gas distribution installations; |
| Erection and repair of boiler stations; |
| Fire prevention and extinguishing systems; |
| Electrical installations; |
| Systems for access control and automation; |
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| Fabrication and installation of steel structures, tanks, silos, technological equipment; |
| Prefabrication and erection of pipelines and gas pipelines; |
| Mechanical installation and erection works; |
| Electrical installations, instrumentation and automation systems; |
| Central heating, ventilation and air conditioning installations; |
| Installation and repair of lifting equipment; |
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