Abbreviation TZB means technical equipment of buildings.
	TZB includes heating, sanitary installations, ventilation- equipment, air-conditioning, electrical wiring, measurements and control.
		These are installations which, although not immediately visible outside the building, breathe life into buildings

Same as with your own health, it is a good practice to also look after internal equipment of buildings and not be shy to invest into their quality. Then they will be "healthy" for a long time.