Definition / Belongs to this divisionThis division includes the installation of piping, heating and air conditioning systems, including extension, conversion, maintenance and repair work.

This division includes:
- installation of the following on the building and other structures:
- heating system (electricity, gas and oil)
- boiler, cooling tower
- non - electric solar collectors
- fans, refrigerators or air conditioners and pipes
- gas pipeline assembly
- steam pipe
- sprinkler fire extinguishing system
- garden irrigation system
- installation of the pipeline
It belongs to this branch - Hungarian supplementThis division includes - Hungarian supplement:
- cleaning the sewer in the building, removing its blockage
It does not belong to this sectorThis division excludes:
- installation of electric underfloor heating, see 43.21
It does not belong to this branch - Hungarian supplementThis division excludes - Hungarian supplement:
- repair of industrial furnaces, boilers, other heating equipment, see 33.12
- cleaning and maintenance of sewers, cleaning of closed stormwater drains, removal of blockages of sewage and closed stormwater drains, see 37.00

Definition / Belongs to this divisionThis division includes the installation of various structures of the building and other structures, including repair and maintenance, with the exception of the installation of electrical, plumbing, heating, air conditioning and industrial machinery.

This division includes:
- installation of the following on buildings and other structures:
- lift, escalator, moving walkway
- automatic and revolving door
- direction indicator light bar
- central vacuum system
- thermal, sound or vibration insulation
It does not belong to this sectorThis division excludes:
- commissioning of industrial machinery and equipment, see 33.20

Definition / Belongs to this divisionThis division includes:
- internal and external plastering of buildings and structures, production of stucco, including the installation of fixing nets